Java - Integer decode() method

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Description

The Java Integer decode() method decodes a String into an Integer. It accepts decimal, hexadecimal, and octal number.

Declaration

Following is the declaration for java.lang.Integer.decode() method

public static Integer decode(String nm) throws NumberFormatException

Parameters

nm − This is the String to decode.

Return Value

This method returns an Integer object holding the int value represented by nm.

Exception

NumberFormatException − if the String does not contain a parsable integer.

Example 1

The following example shows the usage of Integer decode() method to get a Integer object from a string containing decimal number. We've created a String variable and assign it a string containing decimal number. Then using decode method, we're obtaining the Integer object and printing it.

package com.tutorialspoint;
public class IntegerDemo {
   public static void main(String[] args) {
    
      String str = "50";
      /* returns an Integer object holding the int value represented
         by string str */
      System.out.println("Number = " + Integer.decode(str)); 
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Number = 50

Example 2

The following example shows the usage of Integer decode() method to get a Integer object from a string containing a negative decimal number. We've created a String variable and assign it a string containing a negative decimal number. Then using decode method, we're obtaining the Integer object and printing it.

package com.tutorialspoint;
public class IntegerDemo {
   public static void main(String[] args) {
    
      String str = "-50";
      /* returns an Integer object holding the int value represented
         by string str */
      System.out.println("Number = " + Integer.decode(str)); 
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Number = -50

Example 3

The following example shows the usage of Integer decode() method to get a Integer object from a string containing a octal number. We've created a String variable and assign it a string containing an octal number. Then using decode method, we're obtaining the Integer object and printing it.

package com.tutorialspoint;
public class IntegerDemo {
   public static void main(String[] args) {
    
      String str = "0x3";
      /* returns an Integer object holding the int value represented
         by string str */
      System.out.println("Number = " + Integer.decode(str)); 
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Number = 3

Example 4

The following example shows the usage of Integer decode() method to get a Integer object from a string containing a hexadecimal number. We've created a String variable and assign it a string containing a hexadecimal number. Then using decode method, we're obtaining the Integer object and printing it.

package com.tutorialspoint;
public class IntegerDemo {
   public static void main(String[] args) {
    
      String str = "0xff";
      /* returns an Integer object holding the int value represented
         by string str */
      System.out.println("Number = " + Integer.decode(str)); 
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Number = 255