Question

Write a program FindDuplicate.java that reads n integer arguments from the command line into an integer array of length n, where each value is between is 1 and n, and displays true if there are any duplicate values, false otherwise. CODE IN JAVA and NO IMPORT STATEMENTS CAN BE USED

Answer 1

//FindDuplicate.java
public class FindDuplicate {
    public static void main(String[] args) {
        if(args.length>0){
            int sum = 0, n = args.length;

            for(int i = 0;i<n;i++){
                sum += Integer.parseInt(args[i]);
            }

            int actualSum = (n*(n+1))/2;
            if(actualSum==sum){
                System.out.println(false);
            }
            else{
                System.out.println(true);
            }
        }
        else{
            System.out.println("Error: PLease pass command line arguments");
        }
    }
}