Overview
In this tutorial, we show you how to convert String to Int in java. 3 ways to convert String we can use the
Integer.parseInt() method or the
Integer.valueOf() method to convert String into Integer object. Alternatively, we can use
org.apache.commons.lang.math.NumberUtils.toInt() method in
commons-lang-2.6.jar lib.
Using java.lang.Integer.parseInt()
String str = "1";
int numberFormated = Integer.parseInt(str);
System.out.println("numberFormated: " + numberFormated);
Using java.lang.Integer.valueOf()
The
Integer.valueOf() method converts String into Integer object.
String str = "1";
Integer number = = Integer.valueOf(str);
System.out.println("numberFormated: " + number);
Using org.apache.commons.lang.math.NumberUtils.toInt()
- Download apache-lang common from apache home page
- To add the commons-lang-2.6.jar to Eclipse Project Library by right click on the Project, select Build Path -> Configure Build Path ... On tab to Libraries -> Add JARs...
We use NumberUtils.toInt() method to convert String to int.
String str = "1";
int numberFormated = NumberUtils.toInt(str);
System.out.println("numberFormated: " + numberFormated);
ConvertStringToIntExample.java file example
package com.jackrutorial;
import org.apache.commons.lang.math.NumberUtils;
public class ConvertStringToIntExample {
public static void main(String[] args) {
String str = "1";
System.out.println("String: \"1\"");
//Integer.parseInt()
int numberFormated = Integer.parseInt(str);
System.out.println("numberFormated: " + numberFormated);
//Integer.valueOf()
Integer number = Integer.valueOf(str);
System.out.println("numberFormated: " + number);
//NumberUtils.toInt()
numberFormated = NumberUtils.toInt(str);
System.out.println("numberFormated: " + numberFormated);
}
}
