Java - Implement swap() method to swap two integers using an array.

Description

Implement swap() method to swap two integers using an array.

Demo

public class Main {
  public static void main(String[] args) {
    int[] num = { 1, 2 };

    System.out.println("Before swap");
    System.out.println("#1: " + num[0]);
    System.out.println("#2: " + num[1]);

    // Call the swap() method passing the num array
    swap(num);//from  w ww.jav a2  s.  c om

    System.out.println("After swap");
    System.out.println("#1: " + num[0]);
    System.out.println("#2: " + num[1]);
  }

  // The swap() method accepts an int array as argument and swaps the values
  // if array contains two values.
  public static void swap(int[] source) {
    if (source != null && source.length == 2) {
      // Swap the first and the second elements
      int temp = source[0];
      source[0] = source[1];
      source[1] = temp;
    }
  }
}

Result

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