Neden boya yöntemi iki kere çağrıldı?

Question

Tic Tac Toe GUI yaptım ve fare tıklatıldığında paint() yönteminin iki kez çağrıldığını buldum (mouseClicked() olay kodunu denetle). Hiçbir fikrim yok - bu nasıl oluyor ve bu sorunu önlemek için ne yapmalıyım?

import javax.swing.*; 
import java.awt.event.*; 
import java.awt.*; 
public class tic_tac_toe_game extends JFrame implements MouseListener{ 
JPanel contentPane; 
JLabel box_1_1,box_1_2,box_1_3,box_2_1,box_2_2,box_2_3,box_3_1,box_3_2,box_3_3; //x, y coordinate 

static int turn = 1; // 1 is p1 turn 2 is p2 turn 
static boolean win_state = false; 
static boolean break_up = false; 
static boolean cant_turn[][] = new boolean[3][3]; 
public tic_tac_toe_game() { 

    contentPane = new JPanel(); 
    contentPane.setLayout(null); 
    box_1_1 = new JLabel("T"); 
    box_1_2= new JLabel("T"); 
    box_1_3 = new JLabel("T"); 
    box_2_1= new JLabel("T"); 
    box_2_2 = new JLabel("T"); 
    box_2_3= new JLabel("T"); 
    box_3_1 = new JLabel("T"); 
    box_3_2= new JLabel("T"); 
    box_3_3 = new JLabel("T"); 

    //modify it in paint() 


    //contentPane *NO* layout mnager 
    setContentPane(contentPane); 
    setSize(600,600); 
    setVisible(true); 
    setTitle("Tic tac toe game"); 
    setLayout(null); 


} 
public void paint(Graphics g) 
{ 


    g.drawLine(0, getHeight()/3*1, getWidth(), getHeight()/3); // 1, 2 lines haha (hor) 
    g.drawLine(0, getHeight()/3*2, getWidth(), getHeight()/3*2); //  (vertical) 
    g.drawLine(getWidth()/3*1, 0, getWidth()/3*1, getHeight()); // 1, 2 lines haha (hor) 
    g.drawLine(getWidth()/3*2, 0, getWidth()/3*2, getHeight()); //(vertical); 

    setup_UI(); 
    //box_1_1.set 
} 
public void setup_UI() 
{ 
    box_1_1.setFont(new Font("Serif",Font.BOLD,50)); 
    box_1_1.setBounds(getWidth()/3/3*1, getHeight()/3/3*1, 40, 40); 
    box_1_1.addMouseListener(this); 
    contentPane.add(box_1_1); 

    box_1_2.setFont(new Font("Serif",Font.BOLD,50)); 
    box_1_2.setBounds(getWidth()/3/3*1, getHeight()/3/3*4, 40, 40); 
    box_1_2.addMouseListener(this); 
    contentPane.add(box_1_2); 

    box_1_3.setFont(new Font("Serif",Font.BOLD,50)); 
    box_1_3.setBounds(getWidth()/3/3*1, getHeight()/3/3*7, 40, 40); 
    box_1_3.addMouseListener(this); 
    contentPane.add(box_1_3); 

    box_2_1.setFont(new Font("Serif",Font.BOLD,50)); 
    box_2_1.setBounds(getWidth()/3/3*4, getHeight()/3/3*1, 40, 40); 
    box_2_1.addMouseListener(this); 
    contentPane.add(box_2_1); 

    box_2_2.setFont(new Font("Serif",Font.BOLD,50)); 
    box_2_2.setBounds(getWidth()/3/3*4, getHeight()/3/3*4, 40, 40); 
    box_2_2.addMouseListener(this); 
    contentPane.add(box_2_2); 

    box_2_3.setFont(new Font("Serif",Font.BOLD,50)); 
    box_2_3.setBounds(getWidth()/3/3*4, getHeight()/3/3*7, 40, 40); 
    box_2_3.addMouseListener(this); 
    contentPane.add(box_2_3); 

    box_3_1.setFont(new Font("Serif",Font.BOLD,50)); 
    box_3_1.setBounds(getWidth()/3/3*7, getHeight()/3/3*1, 40, 40); 
    box_3_1.addMouseListener(this); 
    contentPane.add(box_3_1); 

    box_3_2.setFont(new Font("Serif",Font.BOLD,50)); 
    box_3_2.setBounds(getWidth()/3/3*7, getHeight()/3/3*4, 40, 40); 
    box_3_2.addMouseListener(this); 
    contentPane.add(box_3_2); 

    box_3_3.setFont(new Font("Serif",Font.BOLD,50)); 
    box_3_3.setBounds(getWidth()/3/3*7, getHeight()/3/3*7, 40, 40); 
    box_3_3.addMouseListener(this); 
    contentPane.add(box_3_3); 
} 
public static void main(String[] args) 
{ 
    tic_tac_toe_game tic = new tic_tac_toe_game(); 
    /*while(tic.win_state== false) 
    { 
    tic.whos_turn(); 
    //tic.rule(); // de termine if player win or not 
    }*/ 
} 
public void rule() 
{ 
    // if(box_1_1.equals('O') == true) 
    //  System.out.append("Yes"); 
} 
public void whos_turn() 
{ 
    if(turn == 1 && break_up == false) 
    { 
    JOptionPane.showMessageDialog(null, "P1's turn ! "); 

    break_up = true; 

    } 
    else if(turn == 2 && break_up == false) 
    { 
    JOptionPane.showMessageDialog(null, "P2's turn ! ");  

    break_up = true; 
    } 
} 

@Override 


public void mouseClicked(MouseEvent e) {   
    // TODO Auto-generated method stub 
     System.out.print("I'm clicked"); //this one called twice 

} 


@Override 
public void mouseEntered(MouseEvent e) { 
    // TODO Auto-generated method stub 

} 
@Override 
public void mouseExited(MouseEvent e) { 
    // TODO Auto-generated method stub 

} 
@Override 
public void mousePressed(MouseEvent e) { 
    // TODO Auto-generated method stub 

} 
@Override 
public void mouseReleased(MouseEvent e) { 
    // TODO Auto-generated method stub 
} 
} 

Answer 1

Sizin paint yöntemi yalnızca boya ve çağrı setup_UI gibi ekstra bir şey yapmamalıyız. Bunun yerine kurucuda setup_UI'u arayın.

Programınızın iş parçacığı olmadığını unutmayın, salıncak bileşenlerini oluşturmak ve değiştirmek için ilk iş parçacığını kullanmamalısınız. https://docs.oracle.com/javase/tutorial/uiswing/concurrency/initial.html