Comparable Interface

Objects that have an ordering are compared using the compareTo() method.

14. Integer Sorting Program

Answer:
No

Integer Sorting Program

Here is a program that uses the static void sort( int[] ) method of Arrays. The method is static so it can be used without constructing an Arrays object.

import java.util.Arrays;

class ArrayDemoOne
{
  public static void main ( String[] args )
  {
    int[] scramble = {148, -23, 67, 110, -17, 44, 103, -12, -8, 91, -12, 43, 0, 9, 80, 34, 21, 44, 15, 11};
    
    System.out.print("Scrambled array:  ");
    for ( int j=0; j < scramble.length; j++ )
      System.out.print( scramble[j] + " ");
      
    System.out.println();
    
    Arrays.sort( scramble );
    
    System.out.print("Sorted    array:  ");
    for ( int j=0; j < scramble.length; j++ )
      System.out.print( scramble[j] + " ");
      
    System.out.println();
       
  }
}

The output of the program is:

Scrambled array:  148 -23 67 110 -17 44 103 -12 -8 91 -12 43 0 9 80 34 21 44 15 11
Sorted    array:  -23 -17 -12 -12 -8 0 9 11 15 21 34 43 44 44 67 80 91 103 110 148

Question 14:
Could compareTo() be used to decide on the order for an array of String references?