[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"site-config":3,"course-tree":6,"blog-categories":8,"blog:post:how-to-convert-string-to-int-java-parseint-valueof-more":36,"blog:page:1":541},{"data":4},{"google_site_verification":5,"ga4_measurement_id":5,"site_name":5,"default_og_image":5,"twitter_handle":5},null,{"data":7},[],{"data":9},[10,16,21,26,31],{"name":11,"slug":12,"description":13,"post_count":14,"subcategories":15},"CSS","css","Learn CSS with practical tutorials and examples covering layouts, Flexbox, Grid, responsive design, typography, positioning, animations, and more.",1,[],{"name":17,"slug":18,"description":19,"post_count":14,"subcategories":20},"HTML","html","Learn HTML with practical tutorials and examples for beginners. Explore HTML tags, elements, attributes, links, images, forms, semantic HTML, and more with clear explanations and real code examples.",[],{"name":22,"slug":23,"description":24,"post_count":14,"subcategories":25},"WPF","wpf","Learn WPF with practical tutorials and examples covering XAML, windows, controls, layouts, data binding, MVVM, commands, styles, templates, debugging, and modern WPF UI development.",[],{"name":27,"slug":28,"description":29,"post_count":14,"subcategories":30},"Python","python","Learn Python with practical tutorials covering strings, lists, functions, exceptions, files, packages, virtual environments, modules, classes, and beginner programming concepts.",[],{"name":32,"slug":33,"description":34,"post_count":14,"subcategories":35},"Java","java","Learn Java with practical tutorials and examples for beginners. Explore Java syntax, variables, data types, classes, objects, methods, inheritance, exceptions, collections, and more with clear explanations and real code examples.",[],{"data":37},{"id":38,"title":39,"slug":40,"excerpt":41,"author":42,"categories":48,"featured_image":50,"reading_time_minutes":53,"meta_title":5,"meta_description":41,"og_image":5,"meta_robots":54,"schema_type":55,"faq_json":5,"video_url":5,"toc_json":56,"published_at":183,"updated_at":183,"content":184,"related":185},5,"How to Convert String to Int Java: parseInt(), valueOf() & More","how-to-convert-string-to-int-java-parseint-valueof-more","Learn how to convert string to int Java the right way with parseInt(), valueOf(), radix conversion, and safe NumberFormatException handling.",{"slug":43,"display_name":44,"job_title":5,"short_bio":5,"expertise_tags":45,"headshot":5,"long_bio":5,"credentials":5,"twitter_url":5,"linkedin_url":5,"github_url":5,"personal_website_url":5,"other_sameas_urls":5,"topics":46,"posts":47},"badar-khalil","Badar Khalil",[],[],[],[49],{"name":32,"slug":33},{"url":51,"alt_text":52,"width":5,"height":5},"\u002Fstorage\u002Fmedia\u002F01M23RNHPZVQHMX2DYD3YKQJF1.webp","String to int conversion in Java",10,[],"Article",[57,62,75,87,99,111,131,135,139,155,159],{"id":58,"text":59,"level":60,"children":61},"the-quickest-way-to-convert-string-to-int-java-values","The Quickest Way to Convert String to Int Java Values",2,[],{"id":63,"text":64,"level":60,"children":65},"convert-string-to-int-using-integerparseint","Convert String to Int Using Integer.parseInt()",[66,71],{"id":67,"text":68,"level":69,"children":70},"basic-parseint-syntax","Basic parseInt() Syntax",3,[],{"id":72,"text":73,"level":69,"children":74},"converting-user-input-to-an-int","Converting User Input to an Int",[],{"id":76,"text":77,"level":60,"children":78},"convert-string-to-integer-using-integervalueof","Convert String to Integer Using Integer.valueOf()",[79,83],{"id":80,"text":81,"level":69,"children":82},"how-integervalueof-works","How Integer.valueOf() Works",[],{"id":84,"text":85,"level":69,"children":86},"parseint-vs-valueof","parseInt() vs valueOf()",[],{"id":88,"text":89,"level":60,"children":90},"convert-a-string-using-a-different-number-base","Convert a String Using a Different Number Base",[91,95],{"id":92,"text":93,"level":69,"children":94},"convert-binary-octal-or-hexadecimal-strings-with-a-radix","Convert Binary, Octal, or Hexadecimal Strings with a Radix",[],{"id":96,"text":97,"level":69,"children":98},"when-to-use-integerdecode","When to Use Integer.decode()",[],{"id":100,"text":101,"level":60,"children":102},"handle-invalid-strings-with-numberformatexception","Handle Invalid Strings with NumberFormatException",[103,107],{"id":104,"text":105,"level":69,"children":106},"what-happens-when-a-string-is-not-a-valid-integer","What Happens When a String Is Not a Valid Integer",[],{"id":108,"text":109,"level":69,"children":110},"safely-convert-user-or-external-input","Safely Convert User or External Input",[],{"id":112,"text":113,"level":60,"children":114},"common-string-to-int-problems-in-java","Common String-to-Int Problems in Java",[115,119,123,127],{"id":116,"text":117,"level":69,"children":118},"leading-and-trailing-whitespace","Leading and Trailing Whitespace",[],{"id":120,"text":121,"level":69,"children":122},"null-strings","Null Strings",[],{"id":124,"text":125,"level":69,"children":126},"decimal-and-formatted-numbers","Decimal and Formatted Numbers",[],{"id":128,"text":129,"level":69,"children":130},"values-outside-the-int-range","Values Outside the int Range",[],{"id":132,"text":133,"level":60,"children":134},"which-string-to-int-java-method-should-you-use","Which String to Int Java Method Should You Use?",[],{"id":136,"text":137,"level":60,"children":138},"common-mistakes-to-avoid-when-converting-string-to-int","Common Mistakes to Avoid When Converting String to Int",[],{"id":140,"text":141,"level":60,"children":142},"practical-examples-of-string-to-int-conversion","Practical Examples of String-to-Int Conversion",[143,147,151],{"id":144,"text":145,"level":69,"children":146},"convert-a-string-before-performing-arithmetic","Convert a String Before Performing Arithmetic",[],{"id":148,"text":149,"level":69,"children":150},"convert-multiple-string-values","Convert Multiple String Values",[],{"id":152,"text":153,"level":69,"children":154},"convert-a-string-safely-in-a-real-world-input-flow","Convert a String Safely in a Real-World Input Flow",[],{"id":156,"text":157,"level":60,"children":158},"wrapping-up","Wrapping Up",[],{"id":160,"text":161,"level":60,"children":162},"frequently-asked-questions-about-string-to-int-in-java","Frequently Asked Questions About String to Int in Java",[163,167,171,175,179],{"id":164,"text":165,"level":69,"children":166},"what-is-the-easiest-way-to-convert-a-string-to-int-in-java","What is the easiest way to convert a String to int in Java?",[],{"id":168,"text":169,"level":69,"children":170},"what-is-the-difference-between-parseint-and-valueof-in-java","What is the difference between parseInt() and valueOf() in Java?",[],{"id":172,"text":173,"level":69,"children":174},"how-do-i-convert-a-string-to-int-without-getting-numberformatexception","How do I convert a String to int without getting NumberFormatException?",[],{"id":176,"text":177,"level":69,"children":178},"can-i-convert-a-decimal-string-directly-to-an-int-in-java","Can I convert a decimal String directly to an int in Java?",[],{"id":180,"text":181,"level":69,"children":182},"how-do-i-convert-a-binary-or-hexadecimal-string-to-an-int-in-java","How do I convert a binary or hexadecimal String to an int in Java?",[],"2026-09-09T19:09:06+00:00","\u003Cp>Anyone who's built a Java program that reads input from a form, a config file, or a command line knows the first roadblock. Everything comes in as a String, and no arithmetic happens until that String becomes a number. Trying to add \u003Ccode>\"5\"\u003C\u002Fcode> and \u003Ccode>\"3\"\u003C\u002Fcode> in Java doesn't give you \u003Ccode>8\u003C\u002Fcode>; it either won't compile or, if you've mixed types carelessly, gives you \u003Ccode>\"53\"\u003C\u002Fcode>. Learning how to convert string to int Java values correctly is one of the first real \"gotchas\" new developers run into, much like \u003Ca href=\"https:\u002F\u002Fwpfsharp.com\u002Fblog\u002Fhow-to-center-a-div-in-css\">centering a div in CSS\u003C\u002Fa> trips up front-end beginners: the fix depends entirely on which specific problem you're actually solving. It stays relevant on every project that touches user input, files, or network data.\u003C\u002Fp>\u003Cp>The good news is that Java gives you a small, well-defined toolkit for this. Most of the confusion isn't about which methods exist, it's about picking the right one and handling the cases where the input isn't a clean number.\u003C\u002Fp>\u003Ch2 id=\"the-quickest-way-to-convert-string-to-int-java-values\">The Quickest Way to Convert String to Int Java Values\u003C\u002Fh2>\u003Cp>For the overwhelming majority of cases, \u003Ccode>Integer.parseInt()\u003C\u002Fcode> is the method you want:\u003C\u002Fp>\u003Cp>java\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-java\">String input = \"42\";\nint number = Integer.parseInt(input);\nSystem.out.println(number + 8); \u002F\u002F prints 50\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>\u003Ccode>input\u003C\u002Fcode> stays a String. \u003Ccode>number\u003C\u002Fcode> is a separate, primitive \u003Ccode>int\u003C\u002Fcode> holding the numeric value that was inside that String. Nothing about the original variable changes; \u003Ccode>parseInt()\u003C\u002Fcode> reads the characters and returns a new value in a different type. Once you have that \u003Ccode>int\u003C\u002Fcode>, it behaves exactly like any other integer, so \u003Ccode>number + 8\u003C\u002Fcode> performs real arithmetic instead of gluing text together.\u003C\u002Fp>\u003Ch2 id=\"convert-string-to-int-using-integerparseint\">Convert String to Int Using Integer.parseInt()\u003C\u002Fh2>\u003Ch3 id=\"basic-parseint-syntax\">Basic parseInt() Syntax\u003C\u002Fh3>\u003Cp>The core method signature, per the \u003Ca href=\"https:\u002F\u002Fdocs.oracle.com\u002Fen\u002Fjava\u002Fjavase\u002F21\u002Fdocs\u002Fapi\u002Fjava.base\u002Fjava\u002Flang\u002FInteger.html\">Java SE documentation\u003C\u002Fa>, is:\u003C\u002Fp>\u003Cp>java\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-java\">public static int parseInt(String s) throws NumberFormatException\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>It takes a String and returns a primitive \u003Ccode>int\u003C\u002Fcode>. Java expects that String to contain only an optional leading \u003Ccode>+\u003C\u002Fcode> or \u003Ccode>-\u003C\u002Fcode> sign followed by decimal digits, nothing else, no spaces, no commas, no decimal points. Both positive and negative values work the same way:\u003C\u002Fp>\u003Cp>java\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-java\">int positive = Integer.parseInt(\"150\");   \u002F\u002F 150\nint negative = Integer.parseInt(\"-150\");  \u002F\u002F -150\u003C\u002Fcode>\u003C\u002Fpre>\u003Ch3 id=\"converting-user-input-to-an-int\">Converting User Input to an Int\u003C\u002Fh3>\u003Cp>Input read through a \u003Ccode>Scanner\u003C\u002Fcode> always arrives as a String, even when the person typing clearly meant a number. That's why \u003Ccode>nextLine()\u003C\u002Fcode> has to pass through \u003Ccode>parseInt()\u003C\u002Fcode> before it's usable in a calculation:\u003C\u002Fp>\u003Cp>java\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-java\">import java.util.Scanner;\n\npublic class AgeCalculator {\n    public static void main(String[] args) {\n        Scanner scanner = new Scanner(System.in);\n        System.out.print(\"Enter your age: \");\n        String rawInput = scanner.nextLine();\n        int age = Integer.parseInt(rawInput);\n        System.out.println(\"In 5 years you'll be \" + (age + 5));\n    }\n}\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>Given \u003Ccode>27\u003C\u002Fcode> as input, this prints \u003Ccode>In 5 years you'll be 32\u003C\u002Fcode>. Skip the conversion and \u003Ccode>age + 5\u003C\u002Fcode> would concatenate a String and an int into \u003Ccode>\"275\"\u003C\u002Fcode> instead of adding two numbers.\u003C\u002Fp>\u003Ch2 id=\"convert-string-to-integer-using-integervalueof\">Convert String to Integer Using Integer.valueOf()\u003C\u002Fh2>\u003Ch3 id=\"how-integervalueof-works\">How Integer.valueOf() Works\u003C\u002Fh3>\u003Cp>\u003Ccode>Integer.valueOf()\u003C\u002Fcode> does something similar to \u003Ccode>parseInt()\u003C\u002Fcode>, but it returns an \u003Ccode>Integer\u003C\u002Fcode> object rather than a primitive \u003Ccode>int\u003C\u002Fcode>:\u003C\u002Fp>\u003Cp>java\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-java\">String priceText = \"199\";\nInteger price = Integer.valueOf(priceText);\nint total = price + 50; \u002F\u002F 249\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>Because Java automatically unboxes an \u003Ccode>Integer\u003C\u002Fcode> into an \u003Ccode>int\u003C\u002Fcode> when it's used in arithmetic, \u003Ccode>price + 50\u003C\u002Fcode> works without any extra code. That automatic unboxing is convenient. It's also why \u003Ccode>valueOf()\u003C\u002Fcode> carries slightly more overhead than \u003Ccode>parseInt()\u003C\u002Fcode>, since it produces (or, for small values, reuses a cached) object instance instead of a bare primitive.\u003C\u002Fp>\u003Ch3 id=\"parseint-vs-valueof\">parseInt() vs valueOf()\u003C\u002Fh3>\u003Cp>The practical difference comes down to what type you actually need:\u003C\u002Fp>\u003Ctable>\u003Ctbody>\u003Ctr>\u003Cth rowspan=\"1\" colspan=\"1\">\u003Cp>Method\u003C\u002Fp>\u003C\u002Fth>\u003Cth rowspan=\"1\" colspan=\"1\">\u003Cp>Returns\u003C\u002Fp>\u003C\u002Fth>\u003Cth rowspan=\"1\" colspan=\"1\">\u003Cp>Use when\u003C\u002Fp>\u003C\u002Fth>\u003C\u002Ftr>\u003Ctr>\u003Ctd rowspan=\"1\" colspan=\"1\">\u003Cp>\u003Ccode>Integer.parseInt(String)\u003C\u002Fcode>\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd rowspan=\"1\" colspan=\"1\">\u003Cp>primitive \u003Ccode>int\u003C\u002Fcode>\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd rowspan=\"1\" colspan=\"1\">\u003Cp>You just need a number for math or comparisons\u003C\u002Fp>\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd rowspan=\"1\" colspan=\"1\">\u003Cp>\u003Ccode>Integer.valueOf(String)\u003C\u002Fcode>\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd rowspan=\"1\" colspan=\"1\">\u003Cp>\u003Ccode>Integer\u003C\u002Fcode> object\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd rowspan=\"1\" colspan=\"1\">\u003Cp>You need an object, e.g. for a \u003Ccode>List<Integer>\u003C\u002Fcode> or a method expecting \u003Ccode>Integer\u003C\u002Fcode>\u003C\u002Fp>\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003Cp>Neither one is universally faster or \"better.\" \u003Ccode>parseInt()\u003C\u002Fcode> is usually the clearer choice when a plain \u003Ccode>int\u003C\u002Fcode> is all a method needs, since it skips the object wrapper entirely. Reach for \u003Ccode>valueOf()\u003C\u002Fcode> when the surrounding code specifically expects an \u003Ccode>Integer\u003C\u002Fcode>, such as adding to a collection that can't hold primitives.\u003C\u002Fp>\u003Ch2 id=\"convert-a-string-using-a-different-number-base\">Convert a String Using a Different Number Base\u003C\u002Fh2>\u003Ch3 id=\"convert-binary-octal-or-hexadecimal-strings-with-a-radix\">Convert Binary, Octal, or Hexadecimal Strings with a Radix\u003C\u002Fh3>\u003Cp>\u003Ccode>parseInt()\u003C\u002Fcode> has an overload that accepts a radix, letting the same digit characters mean different values depending on the number base:\u003C\u002Fp>\u003Cp>java\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-java\">int binaryValue = Integer.parseInt(\"1100110\", 2); \u002F\u002F 102\nint octalValue  = Integer.parseInt(\"77\", 8);       \u002F\u002F 63\nint hexValue    = Integer.parseInt(\"FF\", 16);      \u002F\u002F 255\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>The radix tells Java how to interpret each character: in base 2, only \u003Ccode>0\u003C\u002Fcode> and \u003Ccode>1\u003C\u002Fcode> are valid digits; in base 16, letters \u003Ccode>A\u003C\u002Fcode> through \u003Ccode>F\u003C\u002Fcode> count as digit values 10 through 15. Feed \u003Ccode>\"FF\"\u003C\u002Fcode> in with radix 10 instead of 16 and it throws \u003Ccode>NumberFormatException\u003C\u002Fcode>, because \u003Ccode>F\u003C\u002Fcode> isn't a valid decimal digit.\u003C\u002Fp>\u003Ch3 id=\"when-to-use-integerdecode\">When to Use Integer.decode()\u003C\u002Fh3>\u003Cp>\u003Ccode>Integer.decode()\u003C\u002Fcode> takes a different approach. Instead of a separate radix argument, it reads a prefix baked into the String itself: \u003Ccode>0x\u003C\u002Fcode> or \u003Ccode>0X\u003C\u002Fcode> (or \u003Ccode>#\u003C\u002Fcode>) for hexadecimal, a leading \u003Ccode>0\u003C\u002Fcode> for octal, and no prefix for decimal, per the \u003Ca href=\"https:\u002F\u002Fdocs.oracle.com\u002Fjavase\u002F8\u002Fdocs\u002Fapi\u002Fjava\u002Flang\u002FInteger.html\">Java SE 8 API documentation\u003C\u002Fa>.\u003C\u002Fp>\u003Cp>java\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-java\">int decimalValue = Integer.decode(\"123\");  \u002F\u002F 123\nint hexValue     = Integer.decode(\"0x7B\"); \u002F\u002F 123\nint octalValue   = Integer.decode(\"0173\"); \u002F\u002F 123\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>\u003Ccode>decode()\u003C\u002Fcode> is handy when the format is baked into the data you're reading, like config values written as \u003Ccode>0xFF\u003C\u002Fcode>. If you already know the base and just have plain digits, \u003Ccode>parseInt()\u003C\u002Fcode> with an explicit radix is the simpler, more predictable option since there's no prefix-parsing involved.\u003C\u002Fp>\u003Ch2 id=\"handle-invalid-strings-with-numberformatexception\">Handle Invalid Strings with NumberFormatException\u003C\u002Fh2>\u003Ch3 id=\"what-happens-when-a-string-is-not-a-valid-integer\">What Happens When a String Is Not a Valid Integer\u003C\u002Fh3>\u003Cp>Both \u003Ccode>parseInt()\u003C\u002Fcode> and \u003Ccode>valueOf()\u003C\u002Fcode> throw \u003Ccode>NumberFormatException\u003C\u002Fcode> the moment a String doesn't match what they expect, and that includes a \u003Ccode>null\u003C\u002Fcode> String:\u003C\u002Fp>\u003Cp>java\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-java\">String[] inputs = {\"abc\", \"12.5\", \"10a\", null};\nfor (String value : inputs) {\n    try {\n        int result = Integer.parseInt(value);\n        System.out.println(value + \" -> \" + result);\n    } catch (NumberFormatException e) {\n        System.out.println(value + \" -> NumberFormatException: \" + e.getMessage());\n    }\n}\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>Running this prints a \u003Ccode>NumberFormatException\u003C\u002Fcode> for every entry, including \u003Ccode>null\u003C\u002Fcode>, which fails with a distinct message (\"Cannot parse null string\") rather than throwing a \u003Ccode>NullPointerException\u003C\u002Fcode>. A valid negative number like \u003Ccode>\"-150\"\u003C\u002Fcode> is fine; it's only strings containing characters outside the expected digit-and-sign pattern that trigger the exception. \u003Ccode>\"12.5\"\u003C\u002Fcode> fails for the same reason \u003Ccode>\"abc\"\u003C\u002Fcode> does: a decimal point isn't a digit as far as \u003Ccode>parseInt()\u003C\u002Fcode> is concerned.\u003C\u002Fp>\u003Ch3 id=\"safely-convert-user-or-external-input\">Safely Convert User or External Input\u003C\u002Fh3>\u003Cp>Whenever a String might legitimately be malformed, wrapping the conversion in a \u003Ccode>try-catch\u003C\u002Fcode> beats letting the program crash:\u003C\u002Fp>\u003Cp>java\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-java\">static int parseWithDefault(String value, int fallback) {\n    if (value == null) {\n        return fallback;\n    }\n    try {\n        return Integer.parseInt(value.trim());\n    } catch (NumberFormatException e) {\n        return fallback;\n    }\n}\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>Catching \u003Ccode>NumberFormatException\u003C\u002Fcode> specifically, rather than a blanket \u003Ccode>catch (Exception e)\u003C\u002Fcode>, keeps the handler focused on the one failure mode this code actually expects, so an unrelated bug elsewhere doesn't get silently swallowed along with it.\u003C\u002Fp>\u003Ch2 id=\"common-string-to-int-problems-in-java\">Common String-to-Int Problems in Java\u003C\u002Fh2>\u003Ch3 id=\"leading-and-trailing-whitespace\">Leading and Trailing Whitespace\u003C\u002Fh3>\u003Cp>\u003Ccode>parseInt()\u003C\u002Fcode> does not trim whitespace on its own. \u003Ccode>Integer.parseInt(\" 123 \")\u003C\u002Fcode> throws \u003Ccode>NumberFormatException\u003C\u002Fcode>, because the space characters aren't digits. Calling \u003Ccode>.trim()\u003C\u002Fcode> (or \u003Ccode>.strip()\u003C\u002Fcode> in newer Java versions) before parsing solves this. It just removes characters that were never part of the number to begin with, so the numeric value itself doesn't change.\u003C\u002Fp>\u003Ch3 id=\"null-strings\">Null Strings\u003C\u002Fh3>\u003Cp>A \u003Ccode>null\u003C\u002Fcode> String isn't the same problem as an invalid one. There's no text to inspect at all, so \u003Ccode>parseInt(null)\u003C\u002Fcode> throws \u003Ccode>NumberFormatException\u003C\u002Fcode> with a message noting the null input, confirmed by running it directly rather than assuming. Checking for \u003Ccode>null\u003C\u002Fcode> before parsing, as in the fallback method above, avoids relying on the exception message to distinguish \"missing\" from \"malformed.\"\u003C\u002Fp>\u003Ch3 id=\"decimal-and-formatted-numbers\">Decimal and Formatted Numbers\u003C\u002Fh3>\u003Cp>A String like \u003Ccode>\"12.5\"\u003C\u002Fcode> can't go straight into \u003Ccode>parseInt()\u003C\u002Fcode>, since the method only recognizes whole-number digit sequences. The same goes for formatted numbers with commas, like \u003Ccode>\"1,000\"\u003C\u002Fcode>. If the value genuinely has a fractional part, \u003Ccode>Double.parseDouble()\u003C\u002Fcode> or \u003Ccode>BigDecimal\u003C\u002Fcode> is the appropriate type, not a workaround that strips characters out of an int-bound String.\u003C\u002Fp>\u003Ch3 id=\"values-outside-the-int-range\">Values Outside the int Range\u003C\u002Fh3>\u003Cp>Java's \u003Ccode>int\u003C\u002Fcode> is a 32-bit signed type, capped at \u003Ccode>Integer.MAX_VALUE\u003C\u002Fcode> (2,147,483,647) and \u003Ccode>Integer.MIN_VALUE\u003C\u002Fcode> (-2,147,483,648). A numeric String outside that range, even one made entirely of valid digits, throws \u003Ccode>NumberFormatException\u003C\u002Fcode> when parsed as an \u003Ccode>int\u003C\u002Fcode>:\u003C\u002Fp>\u003Cp>java\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-java\">String tooBig = \"99999999999999\";\nlong asLong = Long.parseLong(tooBig); \u002F\u002F works fine\n\u002F\u002F Integer.parseInt(tooBig) would throw NumberFormatException here\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>When a value might legitimately exceed the \u003Ccode>int\u003C\u002Fcode> range, \u003Ccode>Long.parseLong()\u003C\u002Fcode> or, for arbitrarily large numbers, \u003Ccode>BigInteger\u003C\u002Fcode>, is the right tool instead of forcing it into an \u003Ccode>int\u003C\u002Fcode>.\u003C\u002Fp>\u003Ch2 id=\"which-string-to-int-java-method-should-you-use\">Which String to Int Java Method Should You Use?\u003C\u002Fh2>\u003Cul>\u003Cli>\u003Cp>\u003Ccode>parseInt()\u003C\u002Fcode>: the default choice when you need a primitive \u003Ccode>int\u003C\u002Fcode> for math or comparisons.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>\u003Ccode>valueOf()\u003C\u002Fcode>: when the surrounding code specifically needs an \u003Ccode>Integer\u003C\u002Fcode> object, like a generic collection.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>\u003Ccode>parseInt()\u003C\u002Fcode>\u003Cstrong> with a radix\u003C\u002Fstrong>: for binary, octal, or hexadecimal strings where you already know the base.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>\u003Ccode>decode()\u003C\u002Fcode>: when the base is signaled by a prefix already embedded in the String, such as \u003Ccode>0x\u003C\u002Fcode> or a leading \u003Ccode>0\u003C\u002Fcode>.\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Ch2 id=\"common-mistakes-to-avoid-when-converting-string-to-int\">Common Mistakes to Avoid When Converting String to Int\u003C\u002Fh2>\u003Cul>\u003Cli>\u003Cp>Trying to cast a String directly to \u003Ccode>int\u003C\u002Fcode>, like \u003Ccode>(int) someString\u003C\u002Fcode>, which doesn't compile; casting only works between compatible types, and String isn't one of them for \u003Ccode>int\u003C\u002Fcode>.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>Using the deprecated \u003Ccode>new Integer(String)\u003C\u002Fcode> constructor, which the JDK has marked for removal in favor of \u003Ccode>valueOf()\u003C\u002Fcode>.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>Ignoring \u003Ccode>NumberFormatException\u003C\u002Fcode> entirely and letting external input crash the program.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>Parsing a decimal or comma-formatted string as though it were a plain integer.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>Forgetting about whitespace, \u003Ccode>null\u003C\u002Fcode> values, or the \u003Ccode>int\u003C\u002Fcode> range limit until production input triggers them.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>Reaching for an \u003Ccode>Integer\u003C\u002Fcode> object with \u003Ccode>valueOf()\u003C\u002Fcode> when a plain \u003Ccode>int\u003C\u002Fcode> from \u003Ccode>parseInt()\u003C\u002Fcode> would do the job with less overhead.\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Ch2 id=\"practical-examples-of-string-to-int-conversion\">Practical Examples of String-to-Int Conversion\u003C\u002Fh2>\u003Ch3 id=\"convert-a-string-before-performing-arithmetic\">Convert a String Before Performing Arithmetic\u003C\u002Fh3>\u003Cp>java\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-java\">String quantityText = \"6\";\nString priceText = \"12\";\nint total = Integer.parseInt(quantityText) * Integer.parseInt(priceText);\nSystem.out.println(\"Total: \" + total); \u002F\u002F Total: 72\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>Arithmetic can't happen correctly while either value stays a String; \u003Ccode>\"6\" * \"12\"\u003C\u002Fcode> isn't valid Java at all, since multiplication isn't defined for String operands.\u003C\u002Fp>\u003Ch3 id=\"convert-multiple-string-values\">Convert Multiple String Values\u003C\u002Fh3>\u003Cp>Looping over several values at once, and skipping the ones that don't parse, is a common pattern for cleaning up a batch of input:\u003C\u002Fp>\u003Cp>java\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-java\">String[] rawScores = {\"88\", \" 92\", \"76 \", \"abc\", \"100\"};\nint total = 0;\nint validCount = 0;\nfor (String raw : rawScores) {\n    try {\n        int score = Integer.parseInt(raw.trim());\n        total += score;\n        validCount++;\n    } catch (NumberFormatException e) {\n        System.out.println(\"Skipping invalid score: \" + raw);\n    }\n}\nSystem.out.println(\"Average: \" + (total \u002F validCount));\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>This prints \u003Ccode>Skipping invalid score: abc\u003C\u002Fcode> and then an average calculated only from the four valid entries.\u003C\u002Fp>\u003Ch3 id=\"convert-a-string-safely-in-a-real-world-input-flow\">Convert a String Safely in a Real-World Input Flow\u003C\u002Fh3>\u003Cp>Combining validation, trimming, and a fallback keeps conversion logic contained instead of scattering \u003Ccode>try-catch\u003C\u002Fcode> blocks throughout a codebase:\u003C\u002Fp>\u003Cp>java\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-java\">static boolean isParsable(String value) {\n    return value != null && value.trim().matches(\"-?\\\\d+\");\n}\n\nstatic int safeParse(String value, int fallback) {\n    return isParsable(value) ? Integer.parseInt(value.trim()) : fallback;\n}\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>Checking the shape of the input before parsing means the \u003Ccode>try-catch\u003C\u002Fcode> becomes optional in code paths where a clean fallback matters more than an exception trace.\u003C\u002Fp>\u003Ch2 id=\"wrapping-up\">Wrapping Up\u003C\u002Fh2>\u003Cp>Converting string to int Java values comes down to picking the right method for the job: \u003Ccode>parseInt()\u003C\u002Fcode> for a plain \u003Ccode>int\u003C\u002Fcode>, \u003Ccode>valueOf()\u003C\u002Fcode> when an \u003Ccode>Integer\u003C\u002Fcode> object is required, a radix or \u003Ccode>decode()\u003C\u002Fcode> for non-decimal formats, and a \u003Ccode>try-catch\u003C\u002Fcode> around any input that might not be clean. Once that pattern is second nature, NumberFormatException stops being a mystery and starts being just another expected case to handle.\u003C\u002Fp>\u003Ch2 id=\"frequently-asked-questions-about-string-to-int-in-java\">Frequently Asked Questions About String to Int in Java\u003C\u002Fh2>\u003Ch3 id=\"what-is-the-easiest-way-to-convert-a-string-to-int-in-java\">What is the easiest way to convert a String to int in Java?\u003C\u002Fh3>\u003Cp>\u003Ccode>Integer.parseInt(yourString)\u003C\u002Fcode> is the standard, most direct way to convert a numeric String into a primitive \u003Ccode>int\u003C\u002Fcode> in Java.\u003C\u002Fp>\u003Ch3 id=\"what-is-the-difference-between-parseint-and-valueof-in-java\">What is the difference between parseInt() and valueOf() in Java?\u003C\u002Fh3>\u003Cp>\u003Ccode>parseInt()\u003C\u002Fcode> returns a primitive \u003Ccode>int\u003C\u002Fcode>; \u003Ccode>valueOf()\u003C\u002Fcode> returns an \u003Ccode>Integer\u003C\u002Fcode> object. Use \u003Ccode>parseInt()\u003C\u002Fcode> for plain arithmetic and \u003Ccode>valueOf()\u003C\u002Fcode> when an object type is specifically required, such as in a \u003Ccode>List<Integer>\u003C\u002Fcode>.\u003C\u002Fp>\u003Ch3 id=\"how-do-i-convert-a-string-to-int-without-getting-numberformatexception\">How do I convert a String to int without getting NumberFormatException?\u003C\u002Fh3>\u003Cp>Validate the String first, trim any whitespace, check for \u003Ccode>null\u003C\u002Fcode>, and confirm it contains only digits (with an optional sign) before calling \u003Ccode>parseInt()\u003C\u002Fcode>. Wrapping the call in a \u003Ccode>try-catch\u003C\u002Fcode> handles any input that slips through.\u003C\u002Fp>\u003Ch3 id=\"can-i-convert-a-decimal-string-directly-to-an-int-in-java\">Can I convert a decimal String directly to an int in Java?\u003C\u002Fh3>\u003Cp>Not with \u003Ccode>parseInt()\u003C\u002Fcode> or \u003Ccode>valueOf()\u003C\u002Fcode>; both throw \u003Ccode>NumberFormatException\u003C\u002Fcode> on a String like \u003Ccode>\"12.5\"\u003C\u002Fcode>. Parse it as a \u003Ccode>double\u003C\u002Fcode> first with \u003Ccode>Double.parseDouble()\u003C\u002Fcode>, then cast or round to an \u003Ccode>int\u003C\u002Fcode> if truncating the decimal is acceptable.\u003C\u002Fp>\u003Ch3 id=\"how-do-i-convert-a-binary-or-hexadecimal-string-to-an-int-in-java\">How do I convert a binary or hexadecimal String to an int in Java?\u003C\u002Fh3>\u003Cp>Use \u003Ccode>Integer.parseInt(string, radix)\u003C\u002Fcode> with \u003Ccode>2\u003C\u002Fcode> for binary or \u003Ccode>16\u003C\u002Fcode> for hexadecimal, or use \u003Ccode>Integer.decode()\u003C\u002Fcode> if the String already includes a prefix like \u003Ccode>0x\u003C\u002Fcode>.\u003C\u002Fp>",[186,253,474],{"id":187,"title":188,"slug":189,"excerpt":190,"author":191,"categories":195,"featured_image":197,"reading_time_minutes":53,"meta_title":188,"meta_description":190,"og_image":5,"meta_robots":201,"schema_type":55,"faq_json":5,"video_url":5,"toc_json":202,"published_at":251,"updated_at":252},4,"How to Check if a String Contains a Word in Python","string-contains-python","The direct way to check if a string contains a word in Python, plus whole-word matching, case-insensitive search, and finding word positions.",{"slug":43,"display_name":44,"job_title":5,"short_bio":5,"expertise_tags":192,"headshot":5,"long_bio":5,"credentials":5,"twitter_url":5,"linkedin_url":5,"github_url":5,"personal_website_url":5,"other_sameas_urls":5,"topics":193,"posts":194},[],[],[],[196],{"name":27,"slug":28},{"url":198,"alt_text":5,"width":199,"height":200},"https:\u002F\u002Fwpfsharp.com\u002Fstorage\u002Fblog\u002Ffeatured\u002Fstring-contains-python_1.webp",1200,628,[],[203,207,211,215,219,223,227,231,235,239,243,247],{"id":204,"text":205,"level":69,"children":206},"the-direct-answer-use-the-in-operator","The Direct Answer: Use the in Operator",[],{"id":208,"text":209,"level":69,"children":210},"in-finds-substrings-not-whole-words","in Finds Substrings, Not Whole Words",[],{"id":212,"text":213,"level":69,"children":214},"how-to-match-a-whole-word-instead-of-any-substring","How to Match a Whole Word Instead of Any Substring",[],{"id":216,"text":217,"level":69,"children":218},"case-insensitive-substring-and-word-checks","Case-Insensitive Substring and Word Checks",[],{"id":220,"text":221,"level":69,"children":222},"finding-where-a-match-occurs-find-and-index","Finding Where a Match Occurs: find() and index()",[],{"id":224,"text":225,"level":69,"children":226},"counting-matches-with-count","Counting Matches with count()",[],{"id":228,"text":229,"level":69,"children":230},"checking-several-words-at-once","Checking Several Words at Once",[],{"id":232,"text":233,"level":69,"children":234},"using-regular-expressions-for-pattern-based-text-search","Using Regular Expressions for Pattern-Based Text Search",[],{"id":236,"text":237,"level":69,"children":238},"common-pitfalls-at-a-glance","Common Pitfalls at a Glance",[],{"id":240,"text":241,"level":69,"children":242},"choosing-the-right-method","Choosing the Right Method",[],{"id":244,"text":245,"level":69,"children":246},"frequently-asked-questions","Frequently Asked Questions",[],{"id":248,"text":249,"level":69,"children":250},"conclusion","Conclusion",[],"2026-09-09T16:50:55+00:00","2026-09-09T16:53:02+00:00",{"id":69,"title":254,"slug":255,"excerpt":256,"author":257,"categories":261,"featured_image":263,"reading_time_minutes":266,"meta_title":267,"meta_description":256,"og_image":5,"meta_robots":268,"schema_type":55,"faq_json":5,"video_url":5,"toc_json":269,"published_at":473,"updated_at":473},"What Is WPF in C#? A Complete Guide to Windows Presentation Foundation","what-is-wpf-in-csharp","What is WPF in C#? A clear guide to Windows Presentation Foundation, how it works with C# and XAML, and whether it's worth learning in 2026.",{"slug":43,"display_name":44,"job_title":5,"short_bio":5,"expertise_tags":258,"headshot":5,"long_bio":5,"credentials":5,"twitter_url":5,"linkedin_url":5,"github_url":5,"personal_website_url":5,"other_sameas_urls":5,"topics":259,"posts":260},[],[],[],[262],{"name":22,"slug":23},{"url":264,"alt_text":265,"width":5,"height":5},"\u002Fstorage\u002Fmedia\u002F01M20ZGFAW00NYSYC5YMV0SG53.webp","WPF in C# complete guide infographic featuring Visual Studio XAML designer, data binding architecture, MVVM pattern icons, and C# code logic on a laptop screen.",13,"What Is WPF in C#?",[],[270,281,293,309,317,349,365,389,405,413,429,449,461,465,469],{"id":271,"text":267,"level":60,"children":272},"what-is-wpf-in-c",[273,277],{"id":274,"text":275,"level":69,"children":276},"is-wpf-part-of-c-or-net","Is WPF Part of C# or .NET?",[],{"id":278,"text":279,"level":69,"children":280},"what-does-wpf-stand-for","What Does WPF Stand For?",[],{"id":282,"text":283,"level":60,"children":284},"what-is-wpf-used-for","What Is WPF Used For?",[285,289],{"id":286,"text":287,"level":69,"children":288},"what-can-you-build-with-wpf","What Can You Build With WPF?",[],{"id":290,"text":291,"level":69,"children":292},"what-cant-wpf-be-used-for","What Can't WPF Be Used For?",[],{"id":294,"text":295,"level":60,"children":296},"how-does-wpf-work-with-c","How Does WPF Work With C#?",[297,301,305],{"id":298,"text":299,"level":69,"children":300},"what-is-xaml-in-wpf","What Is XAML in WPF?",[],{"id":302,"text":303,"level":69,"children":304},"what-is-code-behind-in-wpf","What Is Code-Behind in WPF?",[],{"id":306,"text":307,"level":69,"children":308},"simple-wpf-xaml-and-c-example","Simple WPF XAML and C# Example",[],{"id":310,"text":311,"level":60,"children":312},"how-is-a-wpf-application-structured","How Is a WPF Application Structured?",[313],{"id":314,"text":315,"level":69,"children":316},"how-xaml-c-and-wpf-work-together","How XAML, C#, and WPF Work Together",[],{"id":318,"text":319,"level":60,"children":320},"key-features-of-wpf","Key Features of WPF",[321,325,329,333,337,341,345],{"id":322,"text":323,"level":69,"children":324},"xaml-based-ui","XAML-Based UI",[],{"id":326,"text":327,"level":69,"children":328},"data-binding","Data Binding",[],{"id":330,"text":331,"level":69,"children":332},"dependency-properties","Dependency Properties",[],{"id":334,"text":335,"level":69,"children":336},"routed-events","Routed Events",[],{"id":338,"text":339,"level":69,"children":340},"styles-and-control-templates","Styles and Control Templates",[],{"id":342,"text":343,"level":69,"children":344},"wpf-layout-system","WPF Layout System",[],{"id":346,"text":347,"level":69,"children":348},"graphics-and-animation","Graphics and Animation",[],{"id":350,"text":351,"level":60,"children":352},"what-is-data-binding-in-wpf","What Is Data Binding in WPF?",[353,357,361],{"id":354,"text":355,"level":69,"children":356},"how-wpf-data-binding-works","How WPF Data Binding Works",[],{"id":358,"text":359,"level":69,"children":360},"simple-data-binding-example","Simple Data Binding Example",[],{"id":362,"text":363,"level":69,"children":364},"why-data-binding-matters-in-wpf","Why Data Binding Matters in WPF",[],{"id":366,"text":367,"level":60,"children":368},"what-is-mvvm-in-wpf","What Is MVVM in WPF?",[369,373,377,381,385],{"id":370,"text":371,"level":69,"children":372},"model","Model",[],{"id":374,"text":375,"level":69,"children":376},"view","View",[],{"id":378,"text":379,"level":69,"children":380},"viewmodel","ViewModel",[],{"id":382,"text":383,"level":69,"children":384},"why-is-mvvm-commonly-used-with-wpf","Why Is MVVM Commonly Used With WPF?",[],{"id":386,"text":387,"level":69,"children":388},"is-mvvm-required-for-wpf","Is MVVM Required for WPF?",[],{"id":390,"text":391,"level":60,"children":392},"how-to-create-a-wpf-application-in-c","How to Create a WPF Application in C#",[393,397,401],{"id":394,"text":395,"level":69,"children":396},"what-you-need","What You Need",[],{"id":398,"text":399,"level":69,"children":400},"create-a-wpf-project","Create a WPF Project",[],{"id":402,"text":403,"level":69,"children":404},"build-and-run-your-first-wpf-app","Build and Run Your First WPF App",[],{"id":406,"text":407,"level":60,"children":408},"wpf-vs-windows-forms","WPF vs Windows Forms",[409],{"id":410,"text":411,"level":69,"children":412},"which-is-better-wpf-or-winforms","Which Is Better: WPF or WinForms?",[],{"id":414,"text":415,"level":60,"children":416},"wpf-vs-winui-3","WPF vs WinUI 3",[417,421,425],{"id":418,"text":419,"level":69,"children":420},"what-is-winui-3","What Is WinUI 3?",[],{"id":422,"text":423,"level":69,"children":424},"wpf-vs-winui-3-main-differences","WPF vs WinUI 3: Main Differences",[],{"id":426,"text":427,"level":69,"children":428},"should-you-learn-wpf-or-winui","Should You Learn WPF or WinUI?",[],{"id":430,"text":431,"level":60,"children":432},"is-wpf-still-relevant-in-2026","Is WPF Still Relevant in 2026?",[433,437,441,445],{"id":434,"text":435,"level":69,"children":436},"is-wpf-still-supported","Is WPF Still Supported?",[],{"id":438,"text":439,"level":69,"children":440},"does-wpf-work-with-modern-net","Does WPF Work With Modern .NET?",[],{"id":442,"text":443,"level":69,"children":444},"is-wpf-still-used-for-business-applications","Is WPF Still Used for Business Applications?",[],{"id":446,"text":447,"level":69,"children":448},"should-you-learn-wpf-today","Should You Learn WPF Today?",[],{"id":450,"text":451,"level":60,"children":452},"advantages-and-disadvantages-of-wpf","Advantages and Disadvantages of WPF",[453,457],{"id":454,"text":455,"level":69,"children":456},"advantages-of-wpf","Advantages of WPF",[],{"id":458,"text":459,"level":69,"children":460},"disadvantages-of-wpf","Disadvantages of WPF",[],{"id":462,"text":463,"level":60,"children":464},"common-wpf-terms-beginners-should-know","Common WPF Terms Beginners Should Know",[],{"id":466,"text":467,"level":60,"children":468},"frequently-asked-questions-about-wpf-in-c","Frequently Asked Questions About WPF in C#",[],{"id":470,"text":471,"level":60,"children":472},"final-answer-what-is-wpf-in-c","Final Answer: What Is WPF in C#?",[],"2026-09-08T17:04:51+00:00",{"id":60,"title":475,"slug":476,"excerpt":477,"author":478,"categories":482,"featured_image":484,"reading_time_minutes":487,"meta_title":488,"meta_description":477,"og_image":5,"meta_robots":489,"schema_type":55,"faq_json":5,"video_url":5,"toc_json":490,"published_at":539,"updated_at":540},"How to Add an Image in HTML: The Complete img Tag Guide","how-to-add-an-image-in-html","Learn how to add image in HTML with the img tag, alt text, relative paths, srcset, and the picture element — plus common mistakes to avoid.",{"slug":43,"display_name":44,"job_title":5,"short_bio":5,"expertise_tags":479,"headshot":5,"long_bio":5,"credentials":5,"twitter_url":5,"linkedin_url":5,"github_url":5,"personal_website_url":5,"other_sameas_urls":5,"topics":480,"posts":481},[],[],[],[483],{"name":17,"slug":18},{"url":485,"alt_text":486,"width":5,"height":5},"\u002Fstorage\u002Fmedia\u002F01M20TNJ8K254FH80P5N6V87PR.webp","How to add an image in HTML using the img tag, responsive images, and alt text",6,"How to Add Image in HTML",[],[491,495,499,503,507,511,515,519,523,527,531,535],{"id":492,"text":493,"level":60,"children":494},"the-basic-syntax-for-how-to-add-image-in-html","The Basic Syntax for How to Add Image in HTML",[],{"id":496,"text":497,"level":60,"children":498},"understanding-the-img-tags-core-attributes","Understanding the img Tag's Core 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