Integer reverseBytes() Method in Java

The java.lang.Integer.reverseBytes(int a) is a built-in method which returns the value obtained by reversing the order of the bytes in the two’s complement representation of the specified int value.

Syntax : 

public static int reverseBytes(int a)

Parameter: The method takes one parameter a of integer type whose bytes are to be reversed.

Return Value: The method will return the value obtained by reversing the bytes in the specified int value.

Examples:

Input: 75
Output: 1258291200
Explanation:
Consider an integer a = 75 
Binary Representation = 1001011
Number of one bit = 4 
After reversing the bytes we get = 1258291200

Input: -43
Output: -704643073

Below programs illustrate the java.lang.Integer.reverseBytes() method:
Program 1: For a positive number.

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// Java program to illustrate the
// Java.lang.Integer.reverseBytes() method
import java.lang.*;
  
public class Geeks {
  
    public static void main(String[] args)
    {
  
        int a = 61;
        System.out.println(" Integral Number = " + a);
  
        // It will return the value obtained by reversing the bytes in the
        // specified int value
        System.out.println("After reversing the bytes we get = " + 
        Integer.reverseBytes(a));
    }
}

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Output:


Integral Number = 61
After reversing the bytes we get = 1023410176





Program 2: For a negative number.











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// Java program to illustrate the 


// Java.lang.Integer.reverseBytes() method 


import java.lang.*; 


  


public class Geeks { 


  


    public static void main(String[] args) 


    { 


  


        int a = -43; 


        System.out.println(" Integral Number = " + a); 


  


        // It will return the value obtained by reversing the bytes in the 


        // specified int value 


        System.out.println("After reversing the bytes we get = " +  


        Integer.reverseBytes(a)); 


    } 


} 



















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Output:


Integral Number = -43
After reversing the bytes we get = -704643073





Program 3: For a decimal value and string.

Note: It returns an error message when a decimal value and string is passed as an argument.











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// Java program to illustrate the 


// Java.lang.Integer.reverseBytes() method 


import java.lang.*; 


  


public class Geeks { 


  


    public static void main(String[] args) 


    { 


  


        int a = 37.81; 


        System.out.println(" Integral Number = " + a); 


        // It will return the value obtained by reversing the bytes in the 


        // specified int value 


        System.out.println("After reversing the bytes we get = " +  


        Integer.reverseBytes(a)); 


  


        a = "81"; // compile time error will be generated 


        System.out.println(" Integral Number = " + a); 


        System.out.println("After reversing the bytes we get = " +  


        Integer.reverseBytes(a)); 


    } 


} 



















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Output:


prog.java:9: error: incompatible types: possible lossy conversion from double to int
    int a = 37.81;
            ^
prog.java:18: error: incompatible types: String cannot be converted to int
    a = "81";
        ^
2 errors







          
          
          
          

            

    

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