Test if two numbers have the same digits.

Question:

How to test if two numbers contain the same digits.

Answer:

Convert the numbers to Strings.
Convert the Strings to a Char Arrays.
Sort the Char Arrays.
Compare the Char Arrays.

Code:

import java.util.Arrays;
 
public class Example {
  public static void main(String[] args) {
    System.out.println("12 & 21: " + match(12,21));
    System.out.println("123 & 321: " + match(123,321));
    System.out.println("1231 & 2131: " + match(1231,2131));
    System.out.println("876 & 886: " + match(876,866));
  }
  public static boolean match(int a, int b) {
 
    String s1 = String.valueOf(a);
    char[] c1 = s1.toCharArray();
    Arrays.sort(c1);
 
    String s2 = String.valueOf(b);
    char[] c2 = s2.toCharArray();
    Arrays.sort(c2);
 
    return(Arrays.equals(c1,c2));
  }
}

Output:

$ java Example
12 & 21: true
123 & 321: true
1231 & 2131: true
876 & 886: false