动画不能正常工作，除非你调整框架

Question

我在Java中，这GUI类：

import java.awt.Graphics; 
import java.awt.Color; 
import javax.swing.JFrame; 
public class GUI extends JFrame { 
    private boolean[][] board; 
    private int width; 
    private int height; 
    private int multiplier = 25; 
    private int xMarginLeft = 2; 
    private int xMarginRight = 1; 
    private int yMarginBottom = 3; 
    private int yMarginTop = 2; 

    public GUI(boolean[][] board) { 
     this.width = GameOfLife.getNextBoard().length + xMarginLeft; 
     this.height = GameOfLife.getNextBoard()[0].length + yMarginBottom; 
     setTitle("John Conway's Game of Life"); 
     setSize(width * multiplier, height * multiplier); 
     setVisible(true); 
     setDefaultCloseOperation(EXIT_ON_CLOSE); 
    } 

    public void paint(Graphics g) { 
     board = GameOfLife.getNextBoard(); 
     g.setColor(Color.black); 
     g.fillRect(0, 0, width * multiplier, height * multiplier); 
     g.setColor(Color.green); 
     for (int i = 0; i < board.length; i++) { 
      for (int j = 0; j < board[i].length; j++) { 
       if (board[i][j]) { 
        g.fillRect((i + xMarginRight) * multiplier, (j + yMarginTop) * multiplier, multiplier - 1, multiplier - 1); 
       } 
      } 
     } 
    } 
} 

这是从主类的一个片段：

public static void main(String[] args) { 
    GUI boardGraphics = new GUI(nextBoard); 
    boolean[][] board = new boolean[nextBoard.length][nextBoard[0].length]; 
    for (int gen = 0; gen < 25; gen++) { 
     for (int i = 0; i < nextBoard.length; i++) { 
      for (int j = 0; j < nextBoard[i].length; j++) { 
       board[i][j] = nextBoard[i][j]; 
      } 
     } 
     try { 
      boardGraphics.paint(null); 
     } 
     catch (NullPointerException e) {} 
     for (int i = 0; i < board.length; i++) { 
      for (int j = 0; j < board[i].length; j++) { 
       if (board[i][j] && !(countSurrounding(board, i, j) == 2 || countSurrounding(board, i, j) == 3)) { 
        nextBoard[i][j] = false; 
       } 
       else if (!board[i][j] && countSurrounding(board, i, j) == 3) { 
        nextBoard[i][j] = true; 
       } 
      } 
     } 
     try { 
      Thread.sleep(1000); 
     } 
     catch (InterruptedException e) {} 
    } 
} 

然而，当我运行程序，动画只适用于如果我调整/最小化/最大化框架。这完全是错误的动画方法？或者我的代码在某些方面不正确？

Answer 1

其实你是对的：这是的错误的方法，以动画：

1. 你必须运行访问在事件指派线程GUI类的所有代码;
2. 通过在Swing的Timer上安排重复任务来实现动画，并且从不使用涉及Thread.sleep的循环。