Question

I was wondering how would you change a binary number and reverse the 1’s and 0’s? I know how to change an integer number into binary already

Example 1: 5 as a parameter would return 2
Steps: 5 as a binary is 101
          The complement is 010
          010 as an integer is 2

Code to change an integer to a binary number

import java.io.*;
public class DecimalToBinary{
  public static void main(String args[]) throws IOException{
  BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
  System.out.print("Enter the decimal value:");
  String hex = bf.readLine();

  int i = Integer.parseInt(hex);  


  String bynumber = Integer.toBinaryString(i);


  System.out.println("Binary: " + bynumber);
  }
} 

if anyone code please help, thank you!

Answer 1

Use the bitwise not function ~.

int num = 0b10101010;
System.out.println(Integer.toBinaryString(num));         // 10101010
System.out.println(Integer.toBinaryString((byte) ~num)); //  1010101 (note the absent leading zero)