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Java - Integer valueOf(String s, int radix) method
Description
The Java Integer valueOf(String s, int radix) method returns an Integer object holding the value extracted from the specified String s when parsed with the radix given by the second argument radix.
Declaration
Following is the declaration for java.lang.Integer.valueOf() method
public static Integer valueOf(String s, int radix) throws NumberFormatException
Parameters
s − This is the string to be parsed.
radix − This is the radix to be used in interpreting s.
Return Value
This method returns an Integer object holding the value represented by the string argument in the specified radix.
Exception
NumberFormatException − if the String does not contain a parsable int.
Example 1
The following example shows the usage of Integer valueOf(String s, int radix) method to get the Integer object using the specified String having an int value. We've created a String variable and assigned it a int value. Then using valueOf() method, we're getting the object of decimal equivalent value and printing it.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { String s = "170"; System.out.println("String = " + s); /* returns the Integer object of the given string */ System.out.println("valueOf = " + Integer.valueOf(s, 10)); } }
Output
Let us compile and run the above program, this will produce the following result −
String = 170 valueOf = 170
Example 2
The following example shows the usage of Integer valueOf(String s, int radix) method to get the Integer object using the specified String having an int value. We've created a String variable and assigned it a int value. Then using valueOf() method, we're getting the object of octal equivalent value and printing it.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { String s = "170"; System.out.println("String = " + s); /* returns the Integer object of the given string */ System.out.println("valueOf = " + Integer.valueOf(s,8)); } }
Output
Let us compile and run the above program, this will produce the following result −
String = 170 valueOf = 120
Example 3
The following example shows the usage of Integer valueOf(String s) method to get the Integer object using the specified String having an int value. We've created a String variable and assigned it an invalid int value. Then using valueOf() method, we're trying to get the object and printing it. It will throw NumberFormatException.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { String s = "0x170"; System.out.println("String = " + s); /* returns the Integer object of the given string */ System.out.println("valueOf = " + Integer.valueOf(s,8)); } }
Output
Let us compile and run the above program, this will produce the following result −
String = 0x170 Exception in thread "main" java.lang.NumberFormatException: For input string: "0x170" at java.lang.NumberFormatException.forInputString(Unknown Source) at java.lang.Integer.parseInt(Unknown Source) at java.lang.Integer.valueOf(Unknown Source) at com.tutorialspoint.IntegerDemo.main(IntegerDemo.java:11)