How do i make the generate button generate the array values at a random order?

Question

import java.util.Random;

public class Generator extends javax.swing.JFrame {

    String[] gamesL = new String[] {"Dota 2", "Garrys mod", "Dungeon Defenders"};

    Random rand = new Random();

    public Generator() {
        initComponents();
    }

private void initComponents() {...}

private void generateActionPerformed(java.awt.event.ActionEvent evt) {                                         
display.setText("You shall play " + gamesL[0]); 
}

Possible duplicate of http://stackoverflow.com/questions/363681/generating-random-numbers-in-a-range-with-java — Ali Hashemi, Oct 13 '13 at 14:13
From the code snippet, it appears OP wants to shuffle the array and then choose the first element. But the "possible duplicate" leads to the better solution of choosing a random number from `{0,1,2}`, and then taking that element from the array. — Teepeemm, Oct 13 '13 at 14:45

score 3 · Answer 1 · answered Oct 13 '13 at 14:15

3

use Collections.shuffle(your arraylist) to get the shuffled random array; you need to import java.util.Collections.

answered Oct 13 '13 at 14:15

ohmygirl

239
1
5

score 0 · Answer 2 · answered Oct 13 '13 at 14:55

This unsorts an (String) array (vs. Collection)

public void unsortStringArray(String[] a) {
    int len = a.length;
    for(int sourceIdx = 0; sourceIdx<len; sourceIdx++) {
        int destIdx = (int) Math.floor(Math.random() * len);
        String sx = a[destIdx];
        a[destIdx] = a[sourceIdx];
        a[sourceIdx] = sx;
    }
}

How do i make the generate button generate the array values at a random order?

2 Answers2