Question

I need some help with Java. I need to write a Java program that generates a set of random strings from a given string of same length where no character is ever repeated and character belong to the original string. See example.

Example Input: “Hello World” (length 9)

Output: “World oHlel” (length 9)

Answer 1

/**
 * Title: Student
 * FileName: Student.java
 *
 * @author Next Sphere Technologies
 *         Copyright: Copyright Ⓒ Next Sphere Technologies 2019.
 * @version 1.0
 * @Created date: 2/15/2019
 */
import java.util.Scanner;
public class Student {

    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        String name = "";
        // reading input string
        name += sc.nextLine();
        int num = name.length();
        int array[] = new int[name.length()];
        String response = null;
        int i =1;
        double randomDouble = Math.random();
        randomDouble = randomDouble * num + 1;
        int randomInt = (int) randomDouble;
        response =  String.valueOf(name.charAt(randomInt));
        array[randomInt-1] = 1;
        while(i<num){
             randomDouble = Math.random();
            randomDouble = randomDouble * num + 1;
             randomInt = (int) randomDouble;
             if(array[randomInt-1]!=1){
                 response = response + name.charAt(randomInt-1);
                 i++;
               array[randomInt-1] = 1;
             }
        }
        //response
        System.out.println(response);
    }
}