Java Multiple Objects JFrame

Question

I'm creating a Java game for fun and I want to add many things to a JFrame at once. But for some reason, one class and the main method class executes, but the third class containing the second object I want to add doesn't execute. I'm still new to Java so I might get some terms wrong.

Basically I have 3 classes:

main.java (main method class + JFrame constructor class)

Infout.java (class that draws a keyboard-controlled circle + some stationary rectangles)

obj2.java (class that draws a second stationary circle)

Here is the code:

main.java

import javax.swing.JFrame;

public class main
{
  public static void main(String[] args)
  {
JFrame frame = new JFrame();
Infout m = new Infout();
obj2 o = new obj2();

frame.add(o);
frame.add(m);
frame.setVisible(true);
frame.setDefaultCloseOperation(3);
frame.setSize(300, 400);
frame.setTitle("Circle");


  }
}

Infout.java

import javax.swing.*;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;

public class Infout extends JPanel implements ActionListener, KeyListener {

    Timer t = new Timer(5, this);
    double x = 0, y = 0, velx = 0, vely = 0;

    public Infout(){

        t.start();
        addKeyListener(this);
        setFocusable(true);
        setFocusTraversalKeysEnabled(false);

        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }


    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        g2.fill(new Ellipse2D.Double(x, y, 40, 40));
        g2.fill(new Rectangle2D.Double(0, 270, 300, 5));
        g2.fill(new Rectangle2D.Double(140, 270, 5, 300));
        g2.fill(new Rectangle2D.Double(140, 60, 70, 5));
        g2.fill(new Rectangle2D.Double(50, 140, 5, 70));
        g2.fill(new Rectangle2D.Double(150, 130, 5, 40));
        g2.fill(new Rectangle2D.Double(190, 210, 40, 5));
        if (x >= 120 && y >= 270) {
            System.out.println("sum1 has reached tha corner");
            g.drawString("You win!",115,35);
        }
        if (x <= 120 && y >= 270) {
            System.out.println("sum1 has reached tha corner");
            g.drawString("You lose!",115,35);
        }
        if (x == 120 && y >= 270){
            velx = 0;
            vely = 0;
        }
        if (x == 31.5 && y <= 200 && y >= 100){
            velx = 0;
        }
        if (x == 132 && y <= 170 && y >= 100){
            velx = 0;
        }
        if (x <= 190 && x >= 120 && y == 42){
            velx = 0;
        }
        if (x <= 210 && x >= 171 && y == 192){
            velx = 0;
        }

    }


    public void actionPerformed(ActionEvent e) {

        System.out.println("x "+x+"y "+y);

        repaint();
        x += velx;
        y += vely;

        if (x < 0 || x > 260)
        {
            velx = 0;
            vely = 0;
        }
        if (y < 0 || y > 340)
        {
            velx = 0;
            vely = 0;
        }
    }

    public void up() {
        vely = -1.5;
        velx = 0;
    }

    public void down() {
        vely = 1.5;
        velx = 0;
    }

    public void left() {
        velx = -1.5;
        vely = 0;
    }

    public void right() {
        velx = 1.5;
        vely = 0;
    }

    public void keyPressed(KeyEvent e) {
        int code = e.getKeyCode();
        if (code == KeyEvent.VK_UP) {
            up();
        }
        if (code == KeyEvent.VK_DOWN) {
            down();
        }
        if (code == KeyEvent.VK_RIGHT) {
            right();
        }
        if (code == KeyEvent.VK_LEFT) {
            left();
        }

    }

    public void keyTyped(KeyEvent e) {}
    public void keyReleased(KeyEvent e) {}
}

obj2.java

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;

import javax.swing.JPanel;


public class obj2 extends JPanel {

 public void paintComponent(Graphics g1)
  {
      super.paintComponent(g1);
    Graphics2D g3 = (Graphics2D)g1;
    Ellipse2D circle = new Ellipse2D.Double(50.0D, 50.0D, 40.0D, 40.0D);
    g3.fill(circle);
  }

 public obj2(){

     try {
        Thread.sleep(100);
    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
 }
}

So basically, I get no compile errors, but even though I created an instance of each class variable in the main method, and added them both to the JFrame, they cannot both execute at once. If I comment out obj2 from the main method, Infout will show up. If I comment out Infout from the main method, obj2 will show up. But not both at once. If I try both at once, only Infout shows up.

As you may have saw, I thought maybe it had something to do with multithreading so I added some code for multithreading that you may have noticed but I'm sure it's wrong since I only learned about multithreading like an hour ago.

May someone pleeeease help me figure this out? I've tried everything I know to solve it, but it just won't work :C.

I would absolutely LOVE example code of maybe a simple program you guys could quickly whip up showing me how this works. I would even love more if you could explain why/how it works the way it does. I like learning! :)

Thanks!

Ab

Java Multiple Objects JFrame

Here is the code:

Answers (1)

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