GUI沒有更新，因爲它應該

Question

我不熟悉GUI的那麼多，這是我的第一次嘗試之一。我爲我的A *算法創建了一個GUI。它被設置爲15個JButton的網格。我遇到的問題是，當我重置GUI（重置按鈕）時，背景沒有完全改變，除非我點擊另一個JButton。不用說，我很難過。

編輯：網格的70-95％的背景改變爲它們的實際顏色。如果我點擊另一個按鈕，那麼100％的網格是正確的。我還注意到，如果我按住重置按鈕一段較長的時間，則更多的背景更改正確。

下面是我的問題的簡化版本。

import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.awt.Color; 
import java.util.*; 
public class Driver { 
    static Random rand = new Random(); 
    public static void main(String[ ] args) { 
     final int GRID_SIZE = 15; 
     GUI run = new GUI(); 
     int[][] a = new int[GRID_SIZE][GRID_SIZE]; 
     for(int x = 0; x < a.length; x++) 
      for(int y = 0; y < a[x].length; y++) 
      { 
       a[x][y] = rand.nextInt(10); 
       switch(a[x][y]) 
       { 
       case 4: run.getGrid()[x][y].setBackground(Color.MAGENTA); 
        break; 
       case 5: run.getGrid()[x][y].setBackground(Color.CYAN); 
        break; 
       case 7: 
       case 8: 
       case 9: run.getGrid()[x][y].setBackground(Color.BLACK); 
        break; 
       } 
      } 
     run.getReset().addActionListener(new ActionListener(){ 
      public void actionPerformed(ActionEvent e) { 
       for(int x = 0; x < a.length; x++) 
        for(int y = 0; y < a[x].length; y++) 
        { 
         a[x][y] = rand.nextInt(10); 
         switch(a[x][y]) 
         { 
         case 4: run.getGrid()[x][y].setBackground(Color.MAGENTA); 
          break; 
         case 5: run.getGrid()[x][y].setBackground(Color.CYAN); 
          break; 
         case 7: 
         case 8: 
         case 9: run.getGrid()[x][y].setBackground(Color.BLACK); 
          break; 
         default: run.getGrid()[x][y].setBackground(null); 
         } 
        } 
      } 
     }); 
    } 
} 

這裏的GUI

import java.awt.GridBagConstraints; 
import java.awt.GridBagLayout; 

import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.border.LineBorder; 

public class GUI extends JFrame { 
    private final int WINDOW_WIDTH, WINDOW_HEIGHT, GRID_SIZE; 
    private JButton[][] grid; 
    private JButton reset; 
    private GridBagLayout gbl; 
    private GridBagConstraints gbc; 

    public GUI(){ 
     GRID_SIZE = 15; 
     WINDOW_WIDTH = 500; 
     WINDOW_HEIGHT = 500; 
     gbl = new GridBagLayout(); 
     gbc = new GridBagConstraints(); 
     reset = new JButton("Reset"); 
     grid = new JButton[this.GRID_SIZE][this.GRID_SIZE]; 
     this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     this.setLayout(gbl); 
     this.setSize(this.WINDOW_WIDTH, this.WINDOW_HEIGHT); 
     this.buildButtons(); 
     this.setVisible(true); 
    } 
    private void buildButtons() 
    { 
     gbc.fill = GridBagConstraints.HORIZONTAL; 
     gbc.weightx = .5; 
     for(int i = 0; i < grid.length; i++) 
     { 
      gbc.ipady = this.WINDOW_HEIGHT/(this.GRID_SIZE * 3); 
      for(int j = 0; j < grid[i].length; j++) 
      { 
       grid[i][j] = new JButton(); 
       grid[i][j].setOpaque(true); 
       grid[i][j].setBorder(LineBorder.createBlackLineBorder()); 
       grid[i][j].setText(i*this.GRID_SIZE+j+""); 
       gbc.gridx = i; 
       gbc.gridy = j+1; 
       this.add(grid[i][j], gbc); 
      } 
     } 
     gbc.gridx = 0; 
     gbc.weighty = .5; 
     gbc.gridy = this.GRID_SIZE+1; 
     gbc.anchor = GridBagConstraints.PAGE_END; 
     gbc.ipady = this.WINDOW_HEIGHT/(this.GRID_SIZE + 2); 
     gbc.gridwidth = this.GRID_SIZE; 
     this.add(reset, gbc); 
    } 
    public JButton[][] getGrid() 
    { 
     return this.grid; 
    } 
    public JButton getReset() 
    { 
     return this.reset; 
    } 
} 

我的猜測是的ActionListener返回到‘聽’後，這些Jbutton背景被設定。我只是不知道如何解決這個問題。

Answer 1

我對Driver類做了一些修改。看評論，不要猶豫問，如果它是不明確或不回答你的問題：在父容器上

import java.awt.Color; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.util.Random; 

import javax.swing.JButton; 

public class Driver { 

    static Random rand = new Random(); 
    private static final int GRID_SIZE = 15; 

    private int[][] a; //make it a field 
    private GUI run; //make it a field 
    Color defaultColor; 

    //add constructor 
    Driver(){ 

     run = new GUI(); 
     a = new int[GRID_SIZE][GRID_SIZE]; 
     defaultColor = run.getBackground(); 

     //the following code is used twice : use a method 
     reDrawGui(); 

     run.getReset().addActionListener(new ActionListener(){ 
      @Override 
      public void actionPerformed(ActionEvent e) { 

       reDrawGui(); 
      } 
     }); 
    } 

    /** 
    * 
    */ 
    private void reDrawGui() { 

     for(int x = 0; x < a.length; x++) { 

      for(int y = 0; y < a[x].length; y++) 
      { 
       a[x][y] = rand.nextInt(10); 
       JButton button = run.getGrid()[x][y]; 

       switch(a[x][y]) 
       { 
       case 4: button.setBackground(Color.MAGENTA); 
        break; 
       case 5: button.setBackground(Color.CYAN); 
        break; 
       case 7: 
       case 8: 
       case 9:button.setBackground(Color.BLACK); 
        break; 
       default : button.setBackground(defaultColor); 
       } 

      } 
     } 
     //revalidate and repaint after gui changed 
     run.revalidate(); run.repaint(); 
    } 

    public static void main(String[ ] args) { 

     //move intialization code to constructor 
     new Driver(); 
    } 
}