The program is an illustration of arrays.
Arrays are used to hold multiple values.
The program in java, where comments are used to explain each line is as follows:
import java.util.*;
public class Main{
    //This defines the method
public static int[] swapValues(int[] arr) {
    //This swaps the first and second array elements
        int temp = arr[0];
        arr[0] = arr[1];  	arr[1] = temp;
    //This swaps the third and fourth array elements
        temp = arr[2];
        arr[2] = arr[3];  	arr[3] = temp;
    //This returns the swapped array to main
        return arr;
}
//The main method begins here
    public static void main(String[] args) {
        //This creates a Scanner object
        Scanner input = new Scanner(System.in);
  //This declares an array of 4 elements
  int[] intArray = new int[4];
  //This gets input for the array
  for(int i = 0; i<4;i++){
      intArray[i] = input.nextInt();
  }
  //This calls the swapValues method
  intArray=swapValues(intArray);
  //This prints the swapped array
  for (int i = 0; i < 4; i++){
  System.out.print( intArray[i]+ " ");     }
}  
 }
At the end of the program, the elements are swapped and printed.
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