Java Integer reverse() Method

The reverse() method of Java Integer class numerically returns the value obtained by reversing the order of the bits in the 2's complement binary representation of the specified integer value.

Syntax:

Following is the declaration of reverse() method:

Parameter:

DataType	Parameter	Description	Required/Optional
int	i	Integer value whose bits are to be reversed.	Required

Returns:

The reverse() method returns the numeric value obtained by reversing order of the bits in the specified int value.

Exceptions:

Compatibility Version:

Java 1.5 and above

Example 1

public class IntegerReverseExample1 {
	public static void main(String[] args) {
	      int i = 202;
	      System.out.println("Number = " + i);
	      //returns the value obtained by reversing order of the bits in the specified int value
	      System.out.println("After reversing = " + Integer.reverse(i));
    }
}

Output:

Number = 202
After reversing = 1392508928

Example 2

import java.util.Scanner;
public class IntegerReverseExample2 {
	public static void main(String[] args) {
	    System.out.print("Enter Integer Value: ");
	    Scanner readInput = new Scanner(System.in);
	    int i = readInput.nextInt();
	    readInput.close();
	    System.out.println("Number = " + i);
	    // returns the integer value in binary	         
	    System.out.println("Binary Representation = " + Integer.toBinaryString(i));
	    //returns the value obtained by reversing order of the bits in the specified int value
	    System.out.println("After reversing = " + Integer.reverse(i));
    }
}

Output:

Enter Integer Value: 140
Number = 140
Binary Representation = 10001100
After reversing = 822083584

Example 3

public class IntegerReverseExample3 {
	public static void main(String[] args) {
	      int a = 202;
	      int b = -50;
	      System.out.println("Number = " + a);	         
	      System.out.println("Binary Representation = " + Integer.toBinaryString(a));	      
	      System.out.println("After reversing = " + Integer.reverse(a));
	      System.out.println("\nNumber = " + b);	         
	      System.out.println("Binary Representation = " + Integer.toBinaryString(b));	      
	      System.out.println("After reversing = " + Integer.reverse(b));
    }
}

Output:

Number = 202
Binary Representation = 11001010
After reversing = 1392508928

Number = -50
Binary Representation = 11111111111111111111111111001110
After reversing = 1946157055

Example 4

import java.util.Scanner;
public class LongReverseExample4 {
	public static void main(String[] args) {
		System.out.print("Enter Number from console: ");
		Scanner sc = new Scanner(System.in);
		// assign the input to a variable
		long value = sc.nextLong();
		// get the value by reversing the order of the bytes 
		long result = Long.reverse(value);
		// print the result
		System.out.println("Result: " + result);
		sc.close();
	}
}

Output:

Enter Number from console: 3456546
Result: 4935149145179553792

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Java Integer reverse() Method

Syntax:

Parameter:

Returns:

Exceptions:

Compatibility Version:

Example 1

Example 2

Example 3

Example 4

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Java Integer reverse() Method

Syntax: