Thread: About swing Timer in my Math game

I make math game which the question is randomed and, the player must input the correct answer. I make the game with JOptionpane and it works well. Now, I want to add timer in my game, I want to add the time limit when the player try to input the answer for the question at Input Dialog. I already browse the tutorial and some reference in my book about javax.swing.Timer. I just can't understand it. I need someone who can guide me.

I just only need the time limit methodology only, and if the player can't input the answer before the time limit, the program won't end but the program will continue to next procedure.

I'm sorry my english isn't good enough.

What did you find when you searched "joptionpane with timer" or similar?

Do you have to use JOptionPane, or are you ready to advance to a JFrame with JDialogs?

Your English is better than good enough. No worries.

I don't ready to advance JFrame. I guess I have to use just JOptionPane for now plus timer of course. Hahaha

That's fine. Search around a bit for examples or advice about using a javax.swing.Timer, attempt to code it, and come back if/when you need help. Since your code is likely mostly contained in a main() method, you may be able to use a java.util.Timer, but you'll have to reveal more about the existing design to say for sure.

Why are you still using variables like d1, d2, . . ., dx instead of an array? Having a collection of variables that can be iterated with a loop greatly simplifies the if logic. The long chains of if and if/else statements are just (or could be just) unnecessary.

I tried the java.util.Timer:

 
package timertest;
 
import java.util.*;
 
public class TimerTest {
 
    private static int count = 0;
 
    public static void main(String[] arg) {
        Scanner sc = new Scanner(System.in);
        Timer time = new Timer();  // Create a Timer object
        TimerTask timeTask = new TimerTask() {
            // This is what we want the Timer to do once a second.
            public void run() {
                count += 1;
                System.out.println(count);
                if (count == 3) {
                    System.exit(0);
                }
//                System.out.print("answer: ");         <---- IF I ENABLED THIS, IT WON'T WORK, WHY?
//                byte jwb = sc.nextByte();
            }
        };
 
        time.schedule(timeTask, 1000, 1000);
    }
}

What I want is if I enabled the scanner, the scanner will run along with the timer's count. When the count is at 3, the scanner will ask the input, and the program will go into next procedure.

Focusing on the new feature you're trying to learn with a simple study program is an excellent approach.

What do you mean "IT WON'T WORK?" If you're getting errors, post them.

I already said the problem after the code section:

What I want is, if I enabled the scanner, the scanner will run along with the timer's count. When the count is at 3, the scanner will ask the input, and the program will go into next procedure.

After I enabled the code which I marked as a comment in the code section (the scanner that ask the user's input), the program didn't work like I wanted.

No compiler errors? Believe me, there's an error, and it's the primary reason your code is not working as you'd like.

If you're not seeing the error, that's a bigger problem, and that's why I ask. If you're not seeing the error, then you don't know what needs fixing, you'll never learn how to fix it, and you won't learn how to avoid the error in the future. Without the benefit of seeing the error, understanding it, fixing it, and avoiding it next time, the benefit of this study will be less, possibly nil, and you'll repeat the error until you've gone through the process I've described.

Let's start over: Post the error.

This is the output:

 
run:
1  <-- This is the timer's count
answer:

The time didn't increase until I repeatedly inputed the answer, what I want is the timer continually count and doesn't wait the user input the answer.

Compiler errors. Do you have any of those?

Nope, no error has shown.
But, it's not what I want.

With the commented lines uncommented, you should be getting this compiler error:

File: C:\Java Source\TimerTest.java  [line: 22]
Error: Cannot refer to a non-final variable sc inside an inner class defined in a different method

You need to figure out why you're not seeing the compiler error.

No, the compiler not shown any error like that, I swear it
I paste the code above again and run it and not shown any errors.

I solved the timer thing (the time limit is 3 second), I add this in Matimatika class:

 
public String getInput(String input) {
        TimerTask task = new TimerTask() {
            public void run() {
                if (jwb == 0) {
                    System.out.println("No answer");
                    System.exit(0);
                }
            }
        };
        Timer timer = new Timer();
        timer.schedule(task, 3 * 1000);
        String jawaban = JOptionPane.showInputDialog(input);
        timer.cancel();
        return jawaban;
    }

There is still some problem, I'll ask the problem tomorrow. I want going home from my college for now.

So.. This is the problem:
There are 3 question in this game and every question is limited by time. If the user failed to to input the answer the first question before the time limit, the user must continue into second question and sam time limit and so on..
The game's has one class called Matimatika
the question set in here:

first the set method for the operators and digits:

 
 package projek7_gui;
 
import javax.swing.JOptionPane;
import java.util.*;
 
public class Matimatika {
 
    ArrayList list = new ArrayList();
    ArrayList list2 = new ArrayList();
    ArrayList list3 = new ArrayList();
    ArrayList easySort = new ArrayList();
    ArrayList normSort = new ArrayList();
    ArrayList hardSort = new ArrayList();
    Scanner input = new Scanner(System.in);
    Random acak = new Random();
    byte skor, skor2, skor3;
    double d1, d2, d3, d4, d5, d6, op, op2, op3, jwb;
 
     void set() {
 
        d1 = rand.nextInt(20) + 1;
        d2 = rand.nextInt(20) + 1;
        d3 = rand.nextInt(20) + 1;
        op = 0;
    }
 
 void easy() {
        String jawaban, a;
        int answer = 0;
        set();
if (op == 0) {
            a = d1 + " + " + d2 + " - " + d3;
 String b = (getInput(a));
            answer = Integer.parseInt(b);
            jwb = d1 + d2 - d3;
        }
if (answer == jwb) {
            JOptionPane.showMessageDialog(null, "True!");
            skor += 10;
        } else {
            JOptionPane.showMessageDialog(null, "Goblok");
        }
        JOptionPane.showMessageDialog(null, "Your score: " + skor, "Score", JOptionPane.PLAIN_MESSAGE);
    }
 
 void Wizard() {
 for (int i = 0; i < nama.length; i++) {
                                    list.add(new String(nama[i]));
                                    skor = 0;
                                    JOptionPane.showMessageDialog(null, "Turn " + (i + 1) + "!\nPlayer " + nama[i], "Get Ready Dumbass!", JOptionPane.INFORMATION_MESSAGE);
                                    for (int j = 0; j < 3; j++) {
                                        easy();
                                    }
                                    easySort.add(new Byte(skor));
 
                                }
 
 public String getInput(String input) {
 
        TimerTask task = new TimerTask() {
            public void run() {
                if (jwb == 0) {
                    JOptionPane.showMessageDialog(null, "Time Limit", "Time's over!", JOptionPane.WARNING_MESSAGE);
                }
            }
        };
        Timer timer = new Timer();
        timer.schedule(task, 2 * 1000);
        String jawaban = JOptionPane.showInputDialog(input);
        timer.cancel();
        return jawaban;
    }

I simplify the code. The main program will just call the Wizard() method.
So.. the summary:
set() is to set the digits and operators (I simplify the op == 0)
easy() is to make the questions

the wizard is to call the easy() and loop 3 times for the questions

getInput(String input) is to make the dialog input will close after the time limit. (Time limit is 2 seconds)

THE PROBLEM:
When I ran the program, and it shown first question and i test it with no input at all. The warning message has shown but the first question dialog box is still shown.
And I tested it again, if I input the answers for first question and the second question shown BUT the time limit isn't working! After 2 seconds it not shown any warning message in the second question.
How to fix that? I hope you can understand the meaning of my terrible english here...

Oh, I see...
So basically the dialog must wait the user.
So, How about if the time is over, the program will write down automatically the false answer, so the dialog will close and continue into next question.
Can the program do that?

What you describe cannot be done without changing the JOptionPane to a JDialog, a technique you would have found by searching the web as I suggested in Post #2. There's actually a JOptionPane method for doing that which you can learn more about by reading the JOptionPane API. However, if you're unwilling, unable, etc. to use the JDialog as you said in Post #3, then what you describe is not possible.

Yes, I see.
Alright then I'll change the GUI with JDialog. Thanks then! I marked it into solved for now.
Thanks for the help.