Java Integer reverse() method with Examples

by Online Tutorials Library July 22, 2022

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));      }  }  

Test it Now

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));      }  }  

Test it Now

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 with Examples

Java Integer reverse() Method

Syntax:

Parameter:

Returns:

Exceptions:

Compatibility Version:

Example 1

Example 2

Example 3

Example 4

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