string to int java example - Brave Search

How do I convert a String to an int in Java?

stackoverflow.com › questions › 5585779 › how-do-i-convert-a-string-to-an-int-in-java

String myString = "1234";
int foo = Integer.parseInt(myString);

If you look at the Java documentation you'll notice the "catch" is that this function can throw a NumberFormatException, which you can handle:

int foo;
try {
   foo = Integer.parseInt(myString);
}
catch (NumberFormatException e) {
   foo = 0;
}

(This treatment defaults a malformed number to 0, but you can do something else if you like.)

Alternatively, you can use an Ints method from the Guava library, which in combination with Java 8's Optional, makes for a powerful and concise way to convert a string into an int:

import com.google.common.primitives.Ints;

int foo = Optional.ofNullable(myString)
 .map(Ints::tryParse)
 .orElse(0)

Answer from Rob Hruska on Stack Overflow

stackoverflow.com › questions › 5585779 › how-do-i-convert-a-string-to-an-int-in-java

How do I convert a String to an int in Java? - Stack Overflow

String myString = "1234";
int foo = Integer.parseInt(myString);

If you look at the Java documentation you'll notice the "catch" is that this function can throw a NumberFormatException, which you can handle:

int foo;
try {
   foo = Integer.parseInt(myString);
}
catch (NumberFormatException e) {
   foo = 0;
}

(This treatment defaults a malformed number to 0, but you can do something else if you like.)

Alternatively, you can use an Ints method from the Guava library, which in combination with Java 8's Optional, makes for a powerful and concise way to convert a string into an int:

import com.google.common.primitives.Ints;

int foo = Optional.ofNullable(myString)
 .map(Ints::tryParse)
 .orElse(0)

For example, here are two ways:

Integer x = Integer.valueOf(str);
// or
int y = Integer.parseInt(str);

There is a slight difference between these methods:

valueOf returns a new or cached instance of java.lang.Integer
parseInt returns primitive int.

The same is for all cases: Short.valueOf/parseShort, Long.valueOf/parseLong, etc.

geeksforgeeks.org › java › how-to-convert-string-to-int-in-java

String to int in Java - GeeksforGeeks

The most common method to convert a string to a primitive int is Integer.parseInt(). It throws a NumberFormatException if the string contains non-numeric characters. ... // Java Program to demonstrate // String to int conversion using parseInt() ...

Published July 23, 2025

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How do I convert a String to an int in Java? | Sentry

Modern Java versions running on modern systems are very efficient and there should be practically no performance difference between using primitive int and declaring new Integer objects, so you should consider convenience over performance in nearly all cases. Although initializing new Integer objects will take up some extra memory, this will be trivial unless you are keeping vast amounts in memory simultaneously. ... If you need to store the result in a database, then Integer is nullable which might be useful.

stackoverflow.com › questions › 5071040 › java-convert-integer-to-string

Java - Convert integer to string - Stack Overflow

There are multiple ways:

String.valueOf(number) (my preference)
"" + number (I don't know how the compiler handles it, perhaps it is as efficient as the above)
Integer.toString(number)

Integer class has static method toString() - you can use it:

int i = 1234;
String str = Integer.toString(i);

Returns a String object representing the specified integer. The argument is converted to signed decimal representation and returned as a string, exactly as if the argument and radix 10 were given as arguments to the toString(int, int) method.

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How to convert a string to int in Java - IONOS

January 2, 2025 - First we’ll initialize a string that contains the value “7312” and nothing else. Then we’ll convert that Java string to an int using parseInt(), and finally we’ll output the result using the Java command System.out.println.

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How to Convert String to Int in Java - ParseInt Method - Lesson | Study.com

January 9, 2023 - Since we're trying to convert a non-numeric number to numeric, the exception will be a NumberFormatException in the Java compiler. The code to wrap the pareseInt() function in a try and catch block is displayed here: String myString = newString("hello"); try { int makeNumber = Integer.parseInt(myString); System.out.println(makeNumber); } catch (NumberFormatexception e) { System.out.println("That wasn't a number!"); }

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Java Convert int to String | How to Convert an Integer into a String - GeeksforGeeks

April 9, 2025 - ... // Java Program to Illustrate Integer to String Conversions // Using Concatenation with Empty String class Geeks { // Main driver method public static void main(String args[]) { // Custom integer values int a = 1234; int b = -1234; // ...

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Java Program to convert string type variables into int

class Main { public static void main(String[] args) { // create a string variable String str1 = "Programiz"; // convert string to int // using parseInt() int num1 = Integer.parseInt(str1); // print int values System.out.println(num1); // throws NumberFormatException } } We can also convert ...

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How to Convert a String to an int in Java? - GeeksforGeeks

July 12, 2025 - // Java Program to convert String to int public class StringToInt { public static void main(String[] args) { String s = "123"; // Convert string to int using parseInt int n = Integer.parseInt(s); System.out.println("The integer value is: " + n); } }

docs.oracle.com › javase › tutorial › java › data › converting.html

Converting Between Numbers and Strings (The Java™ Tutorials > Learning the Java Language > Numbers and Strings)

For example, in the ValueOfDemo program, we could use: float a = Float.parseFloat(args[0]); float b = Float.parseFloat(args[1]); Sometimes you need to convert a number to a string because you need to operate on the value in its string form. There are several easy ways to convert a number to ...

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Java String to Int – How to Convert a String to an Integer

November 23, 2020 - In Java, we can use Integer.valueOf() and Integer.parseInt() to convert a string to an integer. This method returns the string as a primitive type int. If the string does not contain a valid integer then it will throw a NumberFormatException.

beginnersbook.com › 2013 › 12 › how-to-convert-string-to-int-in-java

Java String to int Conversion

I have covered this method in detail here: Integer.parseInt() Method · String number = "123"; int result = Integer.parseInt(number); System.out.println(result); // Output: 123 · The Integer.valueOf() method converts a String to an Integer object, which can then be unboxed to a primitive int.

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How To Convert Java String To Int - Tutorial With Examples

April 1, 2025 - Each method is Explained with a brief Description, Syntax and an Example: This tutorial will help you to understand how to manipulate Strings in Java with ease using the inbuilt methods. String manipulation involves tasks like concatenating… ... In this tutorial we will explore the different methods to convert Integer to String in Java along with interesting programming examples: We will be covering the use of the following methods provided by the different Java classes to convert Int to String in Java: String concatenation String.valueOf() String.format() Integer.toString() Integer.String(int)…

codegym.cc › java blog › java numbers › how to convert string to int in java

How to convert String to int in Java

In this article we are going to discuss converting String to int (primitive type) and Object type (wrapper) Integer. There are many ways to do it in Java.

Published December 23, 2024

java67.com › 2015 › 08 › 2-ways-to-parse-string-to-int-in-java.html

2 ways to parse String to int in Java - Example Tutorial | Java67

Here is our Java program to convert String to int in Java. This example shows how to use both Integer.parseInt() and Integer.valueOf() method to parse a numeric String to an int primitive in Java.

digitalocean.com › community › questions › how-to-convert-a-string-to-an-integer-in-java

How to convert a string to an integer in Java? | DigitalOcean

September 24, 2021 - In order to set a string variable, we have to use the keyword String, and after it, we set our variables name, and then we put in its value wrapped in quotations marks(" ") or single quotation marks('') like this: ... Integers are whole numbers.

educative.io › answers › how-to-convert-an-integer-to-a-string-in-java

How to convert an integer to a string in Java

The first argument is any string containing %d. The second argument is the integer you want to convert. This method will replace %d with your integer.

freecodecamp.org › news › how-to-convert-a-string-to-an-integer-in-java

String to Int in Java – How to Convert a String to an Integer

November 3, 2022 - We saw how to convert a string to an integer in Java using two methods of the Integer class — parseInt() and valueOf().

docs.vultr.com › java › examples › convert-string-type-variables-into-int

Java Program to convert string type variables into int | Vultr Docs

December 16, 2024 - // parseInt example int num1 = Integer.parseInt("789"); // valueOf example Integer num2 = Integer.valueOf("789"); System.out.println(num1); System.out.println(num2); Explain Code · Although these methods serve slightly different purposes, they ...

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How to Convert a String to Int in Java: Methods and Examples | Edureka

October 1, 2019 - Java Tutorial For Beginners – Java Programming Made Easy! ... There are many methods to convert a string to integer in Java. The method most commonly used is the pareseInt() method. There are multiple methods to convert string to an integer.