Program/Source Code:

The source code to reverse bits of the given number is given below. The given program is compiled and executed successfully.

// Java program to reverse bits of 
// the given number

import java.util.Scanner;

public class Main {
  static int reverseBits(short data) {
    int revNum = 0;
    int i = 0;
    int temp = 0;

    for (i = 0; i < 16; i++) {
      temp = (data & (1 << i));
      if (temp != 0)
        revNum |= (1 << ((16 - 1) - i));
    }
    return revNum;
  }

  public static void main(String[] args) {
    short num = 0x4;
    System.out.printf("Number after reversing bits: %d", reverseBits(num));
  }
}

Output:

Number after reversing bits: 8192

Explanation:

In the above program, we imported the "java.util.Scanner" package to read input from the user. And, created a public class Main. It contains a static method main().

The main() method is an entry point for the program. Here, we created a variable num initialized with 0x4. Then we reversed the bites of number and printed the result.