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Thread: Restarting a thread

  1. #1
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    Default Restarting a thread

    I'm working on a game right now. I want it to have different levels. Right now I have made level 1 and I have a little problem. If you fail to win level 1 I want to have a button to restart the level and if you do win level 1 there should be a button to continue to level 2 (there is some more to it, but that is the part I don't understand). I know how to make buttons and everything, but now once the game restarts level 1 or starts level 2 the threads don't start to run. This is my code.

    My Screen.java
     
    	//score
    	static int coinscore = 0;
    	static boolean awarded = false;
     
    //level
    	static int level = 0;
     
    	//object
    	static EntityBall ball = new EntityBall(200, 150);
     
    	//threads
    	static Thread ballthread = new Thread(ball);
    	static Thread paddle1 = new Thread(ball.paddle1);
    	static Thread paddle2 = new Thread(ball.paddle2);
     
    //random paint things, making images etc.
     
    //code that starts the levels once the button for it is clicked.
    public static void startLevel1() 
    	{
    		awarded = false;
     
    		ballthread.start();
    		paddle1.start();
    		paddle2.start();
     
    		ball.x = 200;
    		ball.y = 150;
     
    		ball.score1 = 0;
    		ball.score2 = 0;
     
    		if(ball.score1 >= 5 || ball.score2 >= 5)
    		{
    			level2explain = 1;
    		}
    	}
     
    	public static void restartLevel1() 
    	{
    		awarded = false;
     
    		ball.score1 = 0;
    		ball.score2 = 0;
     
    		ball.x = 200;
    		ball.y = 150;
     
    		if(ball.score1 >= 5 || ball.score2 >= 5)
    		{
    			level2explain = 1;
    		}
    	}
     
    	public static void startLevel2() 
    	{
    		awarded = false;
     
    		ball.score1 = 0;
    		ball.score2 = 0;
     
    		if(ball.score1 >= 5 || ball.score2 >= 5)
    		{
    			level3explain = 1;
    		}
    	}

    My ActionMouse

    import java.awt.event.MouseEvent;
    import java.awt.event.MouseListener;
     
    public class ActionMouse implements MouseListener 
    {
    	public void mouseClicked(MouseEvent event) 
    	{
    		int mousex = event.getX();
    		int mousey = event.getY();
     
    //starts the game
    		if(Screen.menuScreen == 4)
    		{
    			if (mousex > Screen.storyButton.x && mousex < Screen.storyButton.x + Screen.storyButton.width && 
    					mousey > Screen.storyButton.y && mousey < Screen.storyButton.y + Screen.storyButton.height)
    			{
    				Screen.menuScreen = 0;
    				Screen.level1explain = 1;
    				Screen.story = true;
    			}
    		}
     
    //starts first level
    		if(Screen.level1explain == 25 )
    		{
    			if (mousex > Screen.startButton.x && mousex < Screen.startButton.x + Screen.startButton.width && 
    					mousey > Screen.startButton.y && mousey < Screen.startButton.y + Screen.startButton.height)
    			{
    				Screen.level = 1;
    				Screen.gameScreen = true;
    				Screen.level1explain = 0;
    				Screen.startLevel1();
    			}
    		}
    		//restarts level 1
    		if(Screen.level2explain == 3)
    		{
    			if (mousex > Screen.startButton.x && mousex < Screen.startButton.x + Screen.startButton.width && 
    					mousey > Screen.startButton.y && mousey < Screen.startButton.y + Screen.startButton.height)
    			{
    				Screen.level = 1;
    				Screen.gameScreen = true;
    				Screen.level2explain = 0;
    				Screen.restartLevel1();
    			}
    		}
    		//starts level 2
    		if(Screen.level2explain == 11)
    		{
    			if (mousex > Screen.startButton.x && mousex < Screen.startButton.x + Screen.startButton.width && 
    					mousey > Screen.startButton.y && mousey < Screen.startButton.y + Screen.startButton.height)
    			{
    				Screen.level = 2;
    				Screen.gameScreen = true;
    				Screen.level2explain = 0;
    				Screen.startLevel2();
    			}
    		}
    	}
     
    	//other mouse things are empty
    }

    My ball class.
    import java.awt.*;
    import java.awt.image.ImageObserver;
    import java.util.Random;
     
    import javax.swing.ImageIcon;
     
    public class EntityBall implements Runnable, ImageObserver
    {
    	int x, y;
    	int xDir, yDir;
     
    	int score1, score2;
     
    	Image ballpic;
     
    	static Rectangle ball;
     
    	EntityPaddle paddle1 = new EntityPaddle(830, 250, 1);
    	EntityAIPaddle paddle2 = new EntityAIPaddle(50, 250, 1);
     
    	public EntityBall(int x, int y)
    	{
    //image
    		ImageIcon ballimg = new ImageIcon(this.getClass().getResource("/ball.png"));
    		ballpic = ballimg.getImage();
     
    		if(ballpic == null)
    		{
    			System.err.println("Image problems");
    		}
     
    //random start direction
    		Random rand = new Random();
     
    		this.x = x;
    		this.y = y;
     
    		int startX = rand.nextInt(2);
     
    		if (startX == 0)
    		{
    			this.setXDir(-2);
    		}
    		if (startX != 0)
    		{
    			this.setXDir(2);
    		}
     
    		int startY = rand.nextInt(2);
     
    		if (startY == 0)
    		{
    			this.setYDir(-2);
    		}
     
    		if (startY != 0)
    		{
    			this.setYDir(2);
    		}
     
    		ball = new Rectangle(this.x, this.y, 15, 15);
    	}
    	//direction
    	public void setXDir(int xDirection)
    	{
    		xDir = xDirection;
    	}
     
    	public void setYDir(int yDirection)
    	{
    		yDir = yDirection;
    	}
    	//graphics
    	public void paint(Graphics graphics)
    	{
    		graphics.setColor(Color.white);
    		graphics.drawImage(ballpic, ball.x, ball.y, this);
    	}
    public void move()
    	{
           //direction, collision and score handler
        }
     
    	public void run() 
    	{
    		try
    		{
    			while(Screen.running && Screen.level >= 1)
    			{
    				move();
    				Thread.sleep(8);
     
    				if(Screen.level >= 1)
    				{
    					scoreWatcher();
    				}
    			}
    		}
    		catch(Exception e)
    		{
    			System.err.println(e.getMessage());
    		}
    	}
     
    	private void scoreWatcher() 
    	{
    		if(Screen.level == 1)
    		{
    			if(score1 >= 5 && score2 < 5)
    			{
    				Screen.level2explain = 1;
    				Screen.level = 0;
    			}
     
    			if(score1 >= 5 && score2 == 0)
    			{
    				Screen.level2explain = 2;
    				Screen.level = 0;
    			}
     
    			if(score1 < 5 && score2 >= 5)
    			{
    				Screen.level2explain = 3;
    				Screen.level = 0;
    			}
    		}
     
    		if(Screen.level == 2)
    		{
    			if(score1 >= 5 && score2 < 5)
    			{
    				Screen.level3explain = 1;
    				Screen.level = 0;
    			}
     
    			if(score1 >= 5 && score2 == 0)
    			{
    				Screen.level3explain = 2;
    				Screen.level = 0;
    			}
     
    			if(score1 < 5 && score2 >= 5)
    			{
    				Screen.level3explain = 3;
    				Screen.level = 0;
    			}
    		}
    	}
    //required for image
    	public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height) 
    	{
    		return false;
    	}
    }
    My paddle and AI paddle are mostly the same.

    So my problem is that when I restart level1 or start level 2 it doesn't restart the threads. How do I restart them?


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Restarting a thread

    it doesn't restart the threads. How do I restart them?
    You can not restart a thread that has ended. You need to create a new thread.
    If you don't understand my answer, don't ignore it, ask a question.

  3. The Following User Says Thank You to Norm For This Useful Post:

    wuppy29 (June 20th, 2012)

  4. #3
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    Default Re: Restarting a thread

    Thanks. Do you also know how to reset the ball position? Right now when I do a second level the ball starts at the location it was when the game before ended.

  5. #4
    Super Moderator Norm's Avatar
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    Default Re: Restarting a thread

    how to reset the ball position?
    Are you asking how to change the x,y location for the ball? Does the ball object have methods you can call to change its location?
    If you don't understand my answer, don't ignore it, ask a question.

  6. The Following User Says Thank You to Norm For This Useful Post:

    wuppy29 (June 20th, 2012)

  7. #5
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    Default Re: Restarting a thread

    You are great. You tell me what to do, but not exactly how to do it so I learn from it. Thanks again

  8. #6
    Super Moderator Norm's Avatar
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    Default Re: Restarting a thread

    Good luck.
    If you don't understand my answer, don't ignore it, ask a question.

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