回归迷宫游戏如何放置计时器？

Question

import java.awt.Dimension; 
import java.awt.Font; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.JTable; 
import javax.swing.SwingConstants; 
import javax.swing.table.DefaultTableCellRenderer; 
import javax.swing.table.TableCellRenderer; 

public class Backtrack 
{ 
    private JFrame frame; 

    private JPanel panel; 

    private JTable table; 

    public Backtrack() 

    { 
     table = new JTable(5, 5){ 

      DefaultTableCellRenderer render = new DefaultTableCellRenderer(); 

      { 
       render.setHorizontalAlignment(SwingConstants.CENTER); 
      } 

      @Override 
      public TableCellRenderer getCellRenderer(int arg0, int arg1) 
      { 
       return render; 
      } 

     }; 
     table.setRowHeight(55); 
     table.setCellSelectionEnabled(false); 
     table.setFont(new Font("Segoe UI", Font.BOLD, 32)); 
     table.setValueAt("X", 1, 0); 
     table.setValueAt("X", 1, 2); 
     table.setValueAt("X", 1, 3); 
     table.setValueAt("X", 3, 1); 
     table.setValueAt("X", 4, 0); 
     table.setValueAt("X", 4, 2); 
     table.setValueAt("X", 2, 3); 
     table.setValueAt("X", 3, 4); 

     panel = new JPanel(); 
     panel.setPreferredSize(new Dimension(500, 350)); 
     panel.add(table); 

     frame = new JFrame("Backtracking Algorithm"); 
     frame.setAlwaysOnTop(true); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.setLocation(500, 300); 
     frame.add(panel); 
     frame.pack(); 
     frame.setVisible(true); 

     solve(0, 0, 5); 
    } 

    public boolean solve(int row, int col, int n) 
    { 
     table.setValueAt("O", row, col); 

     try 
     { 
      Thread.sleep(500); 
     } 
     catch (Exception ex){} 

     if (row == n - 1 && col == n - 1) 
     { 
      return true; 
     } 

     //table.setValueAt("", row, col); 

     if (validMove(row, col - 1, n)) 
     { 
      if (solve(row, col - 1, n)) 
      { 
       return true; 
      } 
     } 

     if (validMove(row - 1, col, n)) 
     { 
      if (solve(row - 1, col, n)) 
      { 
       return true; 
      } 
     } 

     if (validMove(row, col + 1, n)) 
     { 
      if (solve(row, col + 1, n)) 
      { 
       return true; 
      } 
     } 

     if (validMove(row + 1, col, n)) 
     { 
      if (solve(row + 1, col, n)) 
      { 
       return true; 
      } 
     } 

     table.setValueAt("", row, col); 
     return false; 
    } 

    public boolean validMove(int row, int col, int n) 
    { 
     if (row > n - 1 || col > n - 1 || row < 0 || col < 0) 
     { 
      return false; 
     } 

     if (table.getValueAt(row, col) != null) 
     { 
      return false; 
     } 

     return true; 

    } 

    public static void main(String[] args) 
    { 
     Backtrack backtrack = new Backtrack(); 
    } 
} 

Answer 1

对于一个计时器，你可以实现

org.apache.commons.lang.time.StopWatch

或

Java.lang.System.nanoTime()

因为你可以简单地声明比分变量并增加它时，你的回报solve()true