Question

Write Java statements that swap the element at the position given by the int variable index with the element that is two positions to its left in an array of char values called myChars. Use an if – else statement to make sure that this operation is possible (i.e. that all indexes are valid) and if not outputs a warning message.

Answer 1

Please find the code below:::

package classes13;

import java.util.Arrays;
import java.util.Scanner;

public class SwapCharacters {
   public static void main(String[] args) {
       char myChars[] = {'A','B','C','D','E','F'};

       Scanner sc = new Scanner(System.in);
       System.out.print("Enter index : ");
       int index = sc.nextInt();
       int leftIndex = index-2; //get two position left
       System.out.println("Before swithcing : "+Arrays.toString(myChars));
       System.out.println("Index to be switch is : "+index);
       if(leftIndex>=0){
           char temp = myChars[index];
           myChars[index] = myChars[leftIndex];
           myChars[leftIndex] = temp;
       }else{
           System.out.println("Left index out of bound!!!Cannot swap elements");
       }
       System.out.println("After swithcing : "+Arrays.toString(myChars));
   }
}