{"id":74190,"date":"2022-06-29T17:02:33","date_gmt":"2022-06-29T11:32:33","guid":{"rendered":"https:\/\/www.mygreatlearning.com\/blog\/java-int-to-string-conversion\/"},"modified":"2025-07-28T14:45:55","modified_gmt":"2025-07-28T09:15:55","slug":"java-int-to-string-conversion","status":"publish","type":"post","link":"https:\/\/www.mygreatlearning.com\/blog\/java-int-to-string-conversion\/","title":{"rendered":"4 Useful Methods to Convert Java Int to String with Examples"},"content":{"rendered":"\n<p>Converting a primitive int (e.g. <code>int number = 10;<\/code>) to a String is a very basic and frequently occurring task in Java programming. There are times when you may need to display a number to the user, add it to a log, or send it in an API request - in such cases this conversion becomes necessary.<\/p>\n\n\n\n<p>The task may seem small, but there are many ways to do it in Java. Which way is best - depends on whether you want to make the code readable, need performance, or need formatting.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"when-to-convert-integer-to-string\">When to Convert Integer to String?<\/h2>\n\n\n\n<p>There are many times when we need to convert an integer to a text in coding. Below are some common situations where this conversion is necessary:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Text Concatenation:<\/strong> When a number needs to be combined with text. For example, if you want to create a line like \"Your score is: 100\", then 100 must first be converted to a string.<\/li>\n\n\n\n<li><strong>Showing in a User Interface (UI):<\/strong> If you are creating a GUI (such as in Swing or JavaFX), then elements like JLabel or Text Field need text to give data - numbers cannot be given directly.<\/li>\n\n\n\n<li><strong>File I\/O:<\/strong> When you want to save a number in a text file, it has to be converted to a string first. Otherwise, it will not be saved in the file correctly.<\/li>\n\n\n\n<li><strong>Data Format of API:<\/strong> Many APIs (especially those related to web services or databases) take data in string form only. In such a situation, it becomes necessary to convert the number first.<\/li>\n<\/ul>\n\n\n\n    <div class=\"courses-cta-container\">\n        <div class=\"courses-cta-card\">\n            <div class=\"courses-cta-header\">\n                <div class=\"courses-learn-icon\"><\/div>\n                <span class=\"courses-learn-text\">Academy Pro<\/span>\n            <\/div>\n            <p class=\"courses-cta-title\">\n                <a href=\"https:\/\/www.mygreatlearning.com\/academy\/premium\/master-java-programming\" class=\"courses-cta-title-link\">Java Programming Course<\/a>\n            <\/p>\n            <p class=\"courses-cta-description\">Learn Java the right way! Our course teaches you essential programming skills, from coding basics to complex projects, setting you up for success in the tech industry.<\/p>\n            <div class=\"courses-cta-stats\">\n                <div class=\"courses-stat-item\">\n                    <div class=\"courses-stat-icon courses-user-icon\"><\/div>\n                    <span>16.05 Hrs<\/span>\n                <\/div>\n                <div class=\"courses-stat-item\">\n                    <div class=\"courses-stat-icon courses-star-icon\"><\/div>\n                    <span>3 Projects<\/span>\n                <\/div>\n            <\/div>\n            <a href=\"https:\/\/www.mygreatlearning.com\/academy\/premium\/master-java-programming\" class=\"courses-cta-button\">\n                Learn Java Programming\n                <div class=\"courses-arrow-icon\"><\/div>\n            <\/a>\n        <\/div>\n    <\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"method-1-using-string-valueofint\">Method 1: Using String.valueOf(int)<\/h2>\n\n\n\n<p>This method is the most straightforward, easy and commonly recommended method when you need to convert an int to a String.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-does-string-valueof-work\">How does String.valueOf() work?<\/h3>\n\n\n\n<p><code>String.valueOf()<\/code> is a static method in the String class and is designed for this purpose. This method takes an integer and returns its string form.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"example\">Example:<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\npublic class IntToStringExample {\n    public static void main(String&#x5B;] args) {\n        int score = 95;\n        \/\/ Converting an int to a String using String.valueOf()\n        String scoreAsString = String.valueOf(score);\n        System.out.println(&quot;The integer value is: &quot; + score);\n        System.out.println(&quot;The string value is: &quot; + scoreAsString);\n        \/\/ To show that this is indeed a String, we can find its length\n        System.out.println(&quot;Length of the string is: &quot; + scoreAsString.length());\n    }\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"output\">Output:<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nThe integer value is: 95\nThe string value is: 95\nLength of the string is: 2\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"why-is-string-valueof-considered-a-good-option\">Why is String.valueOf() considered a good option?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Clarity:<\/strong> When we use <code>String.valueOf()<\/code>, the person reading the code immediately understands that we want to convert a value to a String. This means there is no scope for confusion.<\/li>\n\n\n\n<li><strong>Reliability:<\/strong> This is a standard and built-in method of Java's library, which is meant for just this purpose, converting something to a string. This means there is no need to manually apply tricks.<\/li>\n\n\n\n<li><strong>Null-Safe:<\/strong> This point is a bit interesting. If there is a primitive type (like int), then the question of null does not arise. But if there is an Object wrapper (like Integer) and null is entered in it, then <code>String.valueOf(null)<\/code> simply returns a \"null\" string - it does not give any error or <code>NullPointerException<\/code>.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"method-2-using-integer-tostringint\">Method 2: Using Integer.toString(int)<\/h2>\n\n\n\n<p>This method is also very good and efficient. This is a static method that comes in Java's Integer wrapper class.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-does-integer-tostring-work\">How does Integer.toString() work?<\/h3>\n\n\n\n<p>When we want to convert a primitive int (meaning a simple number like <code>int quantity = 150<\/code>) to a string, then this method works exactly like <code>String.valueOf(int)<\/code>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"example-code\">Example Code:<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\npublic class IntToStringExample {\n    public static void main(String&#x5B;] args) {\n        int quantity = 150;\n        \/\/ Converting int to string using Integer.toString()\n        String quantityAsString = Integer.toString(quantity);\n        System.out.println(&quot;The integer value is: &quot; + quantity);\n        System.out.println(&quot;The string value is: &quot; + quantityAsString);\n    }\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"output\">Output:<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nThe integer value is: 150\nThe string value is: 150\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"short-summary\">Short Summary:<\/h3>\n\n\n\n<p>If you want to convert int to String, then <code>Integer.toString()<\/code> is a safe, simple and fast method. Java developers also use it a lot.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-is-the-difference-between-string-valueof-and-integer-tostring\">What is the difference between String.valueOf() and Integer.toString()?<\/h3>\n\n\n\n<p>If you have a primitive int (meaning a normal number, not an object), then there is almost no difference between the two methods.<\/p>\n\n\n\n<p>Actually, when you write <code>String.valueOf(int i)<\/code>, this method automatically calls <code>Integer.toString(i)<\/code> from inside. That means the work and performance of both is exactly the same.<\/p>\n\n\n\n<p>So what is the difference?<\/p>\n\n\n\n<p>Just the coding style. Whether you write <code>String.valueOf(123)<\/code> or <code>Integer.toString(123)<\/code>, both will give the result \"123\".<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"method-3-using-string-concatenation\">Method 3: Using String Concatenation<\/h2>\n\n\n\n<p>This is a quick and easy method in which we use Java's string concatenation feature.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-does-this-method-work\">How does this method work?<\/h3>\n\n\n\n<p>When you concatenate a String with another data type (such as int) using the + operator, Java automatically converts the data to a String.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"example\">Example:<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\npublic class IntToStringExample {\n    public static void main(String&#x5B;] args) {\n        int pageNumber = 24;\n        \/\/ Using String concatenation\n        String pageNumberAsString = &quot;&quot; + pageNumber;\n        System.out.println(&quot;The integer value is: &quot; + pageNumber);\n        System.out.println(&quot;The string value is: &quot; + pageNumberAsString);\n    }\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"output\">Output:<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nThe integer value is: 24\nThe string value is: 24\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"in-short\">In short:<\/h3>\n\n\n\n<p>Just add + to empty string and int or any number will be converted to String. Shortcut method but does the job for sure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"is-conversion-via-string-concatenation-the-right-way-to-go\">Is conversion via string concatenation the right way to go?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>For simple cases - yes, it works:<\/strong> If you're just looking for quick things like logging a value or debugging, the <code>\"\" + number<\/code> method is pretty short and easy. It's done in one line, so people often use it.<\/li>\n\n\n\n<li><strong>Performance - not so good:<\/strong> This method is a bit heavy in the background. When you do <code>\"\" + number<\/code>, the Java compiler creates a <code>StringBuilder<\/code> object internally, then appends an empty string, then converts the number to a string and appends it.<br><br>All of this adds up to a lot of steps, compared to just using <code>Integer.toString(number)<\/code> directly, which takes fewer steps.<\/li>\n\n\n\n<li><strong>When to avoid:<\/strong> If you're working in performance-critical code (such as inside loops), <code>\"\" + number<\/code> should be avoided. Otherwise, it can be slow.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"method-4-using-string-format\">Method 4: Using String.format()<\/h2>\n\n\n\n<p>This method is the most powerful and flexible, but it is a bit heavy if you only need to perform simple conversions. Its real strength is in creating formatted strings.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-to-convert-int-to-string-using-string-format\">How to convert int to string using String.format()?<\/h3>\n\n\n\n<p>It uses a placeholder named <code>%d<\/code>, which stands for an integer value.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"example\">Example:<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\npublic class IntToStringExample {\n    public static void main(String&#x5B;] args) {\n        int userId = 404;\n        \/\/ Use of String.format()\n        String userIdAsString = String.format(&quot;%d&quot;, userId);\n        System.out.println(&quot;The string value is: &quot; + userIdAsString);\n    }\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"output\">Output:<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nThe string value is: 404\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"when-to-use-string-format\">When to use String.format()?<\/h3>\n\n\n\n<p>This method is very useful when the goal is not just to convert a number to a string, but to do extra formatting on it, such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Zero-padding (e.g. 001, 002)<\/li>\n\n\n\n<li>Proper alignment (bringing text in equal lines)<\/li>\n\n\n\n<li>Inserting a number in a sentence in a stylish way.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"a-quick-guide-when-to-use-which-method\">A quick guide: When to use which method<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Method<\/th><th>When is it correct<\/th><th>Code readability<\/th><th>Performance<\/th><\/tr><\/thead><tbody><tr><td><code>String.valueOf(i)<\/code><\/td><td>General use, when you need clean and clear code<\/td><td>Excellent<\/td><td>Excellent<\/td><\/tr><tr><td><code>Integer.toString(i)<\/code><\/td><td>Excellent for fast and efficient code<\/td><td>Excellent<\/td><td>Excellent<\/td><\/tr><tr><td><code>\"\" + i<\/code><\/td><td>When you need to create a string quickly<\/td><td>Fair enough<\/td><td>Not the best<\/td><\/tr><tr><td><code>String.format(\"%d\", i)<\/code><\/td><td>When you need to do complex formatting (like padding etc.)<\/td><td>Fair enough<\/td><td>Slightly slow (due to extra overhead)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Our advice:<\/strong> If you are coding on a daily basis, then use <code>String.valueOf(i)<\/code> only. This is a simple, clean and easily understood method everywhere.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"frequently-asked-questions-faqs\">Frequently Asked Questions (FAQs)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"q-what-is-the-difference-between-int-and-integer\">Q: What is the difference between int and Integer?<\/h3>\n\n\n\n<p>A: <code>int<\/code> is a primitive data type - meaning it can store only a simple number (e.g. 5, 100). <code>Integer<\/code> is a wrapper class - it converts a primitive <code>int<\/code> into an object, allowing you to use it in collections (e.g. <code>ArrayList<\/code>) and run methods on it.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"q-how-to-convert-a-string-back-to-an-int\">Q: How to convert a String back to an int?<\/h3>\n\n\n\n<p>A: The <code>Integer.parseInt()<\/code> method is used for this.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"example\">Example:<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nString s = &quot;123&quot;;\nint i = Integer.parseInt(s);\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"q-what-is-the-fastest-way-to-convert-an-int-to-a-string\">Q: What is the fastest way to convert an int to a String?<\/h3>\n\n\n\n<p>A: Both <code>Integer.toString()<\/code> and <code>String.valueOf()<\/code> are considered the fastest. But honestly, the performance difference is so small that it won't matter in 99% of projects. So readability is more important. 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