Thread: Create A Countdown In Java

Hi, I'm making a small play in java in which you have a limited time to make as many moves as possible (with the aim of achieving a maximum score), like this: http://apps4review.com/wp-content/up...ed-Blitz_2.jpg

In the game panel I see the map on which you will perform the moves and a score indicator constantly updated. I have to add the indicator that shows me the passage of time (first 3 minutes), in digital format mm: ss. I thought I will be a useful thread called Countdown because I have to stop this counter if the user presses the pause button in the game. Then wanting to continue the game shall resume the countdown.

What approach could I use?

Unfortunately I could not write anything yet because I do not know where to start.
Thanks anyway for the suggestion

By studying the example in the link Swing Timers - Tutorials - Static Void Games

I noticed that the class "MyListener" implements ActionListener. In my case I will have action on the part of MyListener in response to an event triggered by MouseListener.

In order to better understand:
I have a Game class (extends JPanel) where the constructor has associated this.addMouseMotionListener (new MouseMotionListener () {...} and this.addMouseListener (new MouseListener () {.....} because I need to work with both. wanting to tie the class MyListener how should I implement it to make sure it works?

Your setup and subsequent question are too vague. Show some short example code that outlines the classes you've mentioned and how they should relate to each (you might figure it out putting that together) and ask a question based on that construction.

This is the class Game

public Game(final MainFrame mainFrame,  final GameManager gameManager, ImageProvider imageProvider) {
				this.setLayout(null);
				dragX=0;
				dragY=0;
				direction=-1;
				setPress= false;
				drawBackground=false;
				this.mainFrame = mainFrame;
				this.gameManager = gameManager;
				this.imageProvider = imageProvider;
				this.wManager = gameManager.getWorldManager();
				this.currentWorld= gameManager.getCurrentWorld();
				inserts = this.getInsets();
 
				worldHeight = gameManager.getCurrentWorld().getData().length;
				worldWidth = gameManager.getCurrentWorld().getData().length;
 
				width = imageProvider.getImage().getWidth(this);
				height = imageProvider.getImage().getHeight(this);
 
				paintPauseButton();
 
				this.addMouseMotionListener(new MouseMotionListener() {
 
					@Override
					public void mouseMoved(MouseEvent e) {}
 
					@Override
					public void mouseDragged(MouseEvent e) 
					{
						if(setPress == false){
							dragY = e.getX()/width;
							dragX = e.getY()/height;		
							setPress=true ;
						}
						else{
							lastY = e.getX()/width;
							lastX = e.getY()/height;
						}
						repaint();
						e.consume();
					}
 
				});
 
				this.addMouseListener(new MouseListener() {
					@Override
					public void mouseClicked(MouseEvent e) {
					  int clickY = e.getX()/width;
					  int clickX = e.getY()/height;
 
			                  JOptionPane.showMessageDialog(mainFrame, "ERROR", "Message", JOptionPane.CLOSED_OPTION);
			                  repaint();
			                  e.consume();
					}
 
					@Override
					public void mouseReleased(MouseEvent e){
							try {
								Thread.sleep(10);
							} catch (InterruptedException e1) {
								// TODO Auto-generated catch block
								e1.printStackTrace();
							}
						if(lastX < pressX){ //UP
						checkMoves();
						direction = 0;
 				                wManager.move(Game.this.gameManager.set, direction, wManager.worldTmp, dragX, dragY);
 
						setPress = false;
						drawBackground=false;
 
 
						else if(lastX > pressX){ //DOWN
						checkMoves();
						direction = 1;
						wManager.move(Game.this.gameManager.set, direction, wManager.worldTmp, dragX, dragY);
						setPress = false;
						drawBackground=false;
						}
 
						else if(lastY < pressY ){ //LEFT
						checkMoves();
						direction = 2;
						wManager.move(Game.this.gameManager.set, direction, wManager.worldTmp, dragX, dragY);
						setPress = false;
						drawBackground=false;
						}
                                             else{
						checkMoves();
						direction = 3;
						wManager.move(Game.this.gameManager.set, direction, wManager.worldTmp, dragX, dragY);
						setPress=false;
						drawBackground=false;
						}
 
						repaint();
						e.consume();
					}
 
					@Override
					public void mouseEntered(MouseEvent e) {}
 
					@Override
					public void mouseExited(MouseEvent e) {}
 
					@Override
					public void mousePressed(MouseEvent e){
						pressX =  e.getY()/height; 
						pressY = e.getX()/width; 
						drawBackground = true;
						repaint();
						e.consume();
					}
				});
			}
 
 
private void paintTime(Graphics g, int worldHeight2, int worldWidth2) {
			g.drawImage(imageProvider.getTime(), worldWidth2 + 1000, worldHeight2 + 300, this);	
			f = new Font("Cooper Black", Font.BOLD, 90);
			g.setFont(f);
			g.setColor(Color.RED);
                   //Here I have to draw the string that will represent the passing of time
	}
 
protected void paintComponent(Graphics g) {
			super.paintComponent(g);
			g.drawImage(imageProvider.getBackgroundGame(), 0, 0, getWidth(), getHeight(), this);
 
                        //this function draws a map of my game
			paintMap(g, wManager.worldTmp, worldHeight, worldWidth); 
 
			paintTime(g, worldHeight, worldWidth);
		}

How could I add the function MyListener present in the link above?

How could I add the function MyListener present in the link above?

I'm not sure what you mean by that. What is a 'function' in Java? And I'm not sure what 'link above' you are referring to. Why don't you try adding it just as you would any other class or interface (whatever it is), and if you have errors to resolve, come back with the code and the error.

You're showing the Game() constructor, right? You've overused 'this.'

What happens when you add the annotation @Override to your paintComponent() method?

The Game class can extend one class and implement many interfaces.

With regard to the ActionListener I would like to add it to the JButton "Start Game" .

    public String show="";
    JButton startGame = new JButton(new ImageIcon("start.png");
    startGame .setBorder(null);
 
    Dimension size = timeButton.getPreferredSize();
    startGame .setBounds(100 + inserts.left, 280 + inserts.bottom, size.width, size.height);
    startGame .addActionListener(listener); 
    // where MyTime listener = new MyTime (show, setTimeGame (180));
   // Pressing " StartGame " must take the following action : mainFrame.switchGamePanel (), which represents the game screen .
 
 
 
//The class MyTime
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
               public class MyTime implements ActionListener{
 
		private int totalTime = 0;		
		private String showTime;
 
		public MyTime(String showTime, int totalTime){
			this.showTime = showTime;
			this.totalTime=totalTime;
		}
 
		public void actionPerformed(ActionEvent e) {
			--totalTime;
			setShowTime(""+totalTime);
		}
 
		public String getShowTime() {
			return showTime;
		}
 
		public void setShowTime(String showTime) {
			this.showTime = showTime;
		}
}

And the switch panel who should do it?
Could you show me an example if possible?

I created my countdown thread!
The manufacturer of the thread as a parameter will have the time in seconds (eg 120) and then be shown divided into minutes and seconds. In this case, doing 120/60 I get the minutes, but in the case where there are also second to display (eg 150), how could I do?

Do you mean that for 150 seconds the display should be 2:30? How do you find what's left (the remainder) after dividing by something?

I solved:

long totalSeconds = 150;
long minutes = totalSeconds / 60;
long seconds = totalSeconds % 60;
//minutes -> 2
//seconds -> 30

Excellent!