Question

I would really like to find another way to do this program Random rand = new Random(); String choice = null; boolean valid = false; int a = rand.nextInt(10); int b = rand.nextInt(10); int c = rand.nextInt(10); int d = rand.nextInt(10); while (!valid) { // do{ // if (a == b) { rand.nextInt(10); } if (a == c) { rand.nextInt(10); } if (a == d) { rand.nextInt(10); } if (b == c) { rand.nextInt(10); } if (b == d) { rand.nextInt(10); } if (b == a) { rand.nextInt(10); } if (c == a) { rand.nextInt(10); } if (c == b) { rand.nextInt(10); } if (c == d) { rand.nextInt(10); if (d == a) { rand.nextInt(10); } if (d == b) { rand.nextInt(10); } if (d == c) { rand.nextInt(10); } // }while } } choice = Integer.toString(a)+ Integer.toString(b)+ Integer.toString(c)+ Integer.toString(d); Game g = new Game(); g.setRandomNumberGame(choice); dao.addGame(g); //create game object //save to dao return g; I just need help writing a program that generates a random 4 digit number where every digit is different. For each round, the user guesses a number and is told exact and partial matches

Answer 1

Here is code:

Random rand = new Random();

String choice = null;
int[] ints = new Random().ints(0, 10).distinct().limit(4).toArray();
int a = ints[0];
int b = ints[1];
int c = ints[2];
int d = ints[3];
choice = Integer.toString(a) + Integer.toString(b) + Integer.toString(c) + Integer.toString(d);
Game g = new Game();
g.setRandomNumberGame(choice);
System.out.println(choice);

Sample code :

import java.util.Random;
public class Game {
String randomNumber = "";

public static void main(String[] args) {
Random rand = new Random();

String choice = null;
int[] ints = new Random().ints(0, 10).distinct().limit(4).toArray();
int a = ints[0];
int b = ints[1];
int c = ints[2];
int d = ints[3];
choice = Integer.toString(a) + Integer.toString(b) + Integer.toString(c) + Integer.toString(d);
Game g = new Game();
g.setRandomNumberGame(choice);
System.out.println(choice);
// dao.addGame(g);
}

public void setRandomNumberGame(String number) {
this.randomNumber = number;
}
}

Output: