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Java - Integer reverseBytes() method
Description
The Java Integer reverseBytes() method returns the value obtained by reversing the order of the bytes in the two's complement binary representation of the specified int value.
Declaration
Following is the declaration for java.lang.Integer.reverseBytes() method
public static int reverseBytes(int i)
Parameters
i − This is the int value.
Return Value
This method returns the value obtained by reversing order of the bytes in the specified int value.
Exception
NA
Example 1
The following example shows the usage of Integer reverseBytes() method to get an int by reversing the order of the bytes in the two's complement binary representation of the specified int value. We've created a int variable and assigned it a positive int value. Then using toBinaryString() method, we're printing the binary format of the value. Using bitCount(), we're printing the one bit count and then value obtained by reversing order of the bytes in the specified int value using reverseBytes() method.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { int i = 170; System.out.println("Number = " + i); /* returns the string representation of the unsigned integer value represented by the argument in binary (base 2) */ System.out.println("Binary = " + Integer.toBinaryString(i)); // returns the number of one-bit System.out.println("Number of one bit = " + Integer.bitCount(i)); /* returns the value obtained by reversing order of the bytes in the specified int value */ System.out.println("After reversing = " + Integer.reverseBytes(i)); } }
Output
Let us compile and run the above program, this will produce the following result −
Number = 170 Binary = 10101010 Number of one bit = 4 After reversing = -1442840576
Example 2
The following example shows the usage of Integer reverseBytes() method to get an int by reversing the order of the bytes in the two's complement binary representation of the specified negative int value. We've created a int variable and assigned it a positive int value. Then using toBinaryString() method, we're printing the binary format of the value. Using bitCount(), we're printing the one bit count and then value obtained by reversing order of the bytes in the specified int value using reverseBytes() method.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { int i = -170; System.out.println("Number = " + i); /* returns the string representation of the unsigned integer value represented by the argument in binary (base 2) */ System.out.println("Binary = " + Integer.toBinaryString(i)); // returns the number of one-bit System.out.println("Number of one bit = " + Integer.bitCount(i)); /* returns the value obtained by reversing order of the bytes in the specified int value */ System.out.println("After reversing = " + Integer.reverseBytes(i)); } }
Output
Let us compile and run the above program, this will produce the following result −
Number = -170 Binary = 11111111111111111111111101010110 Number of one bit = 28 After reversing = 1459617791
Example 3
The following example shows the usage of Integer reverseBytes() method to get an int by reversing the order of the bytes in the two's complement binary representation of the specified zero value. We've created a int variable and assigned it a positive int value. Then using toBinaryString() method, we're printing the binary format of the value. Using bitCount(), we're printing the one bit count and then value obtained by reversing order of the bytes in the specified int value using reverseBytes() method.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { int i = 0; System.out.println("Number = " + i); /* returns the string representation of the unsigned integer value represented by the argument in binary (base 2) */ System.out.println("Binary = " + Integer.toBinaryString(i)); // returns the number of one-bit System.out.println("Number of one bit = " + Integer.bitCount(i)); /* returns the value obtained by reversing order of the bytes in the specified int value */ System.out.println("After reversing = " + Integer.reverseBytes(i)); } }
Output
Let us compile and run the above program, this will produce the following result −
Number = 0 Binary = 0 Number of one bit = 0 After reversing = 0