所以我有一个让机器人穿过迷宫的程序。当它运行时，它会同时绘制机器人所处的每个位置。我查看了Swing Timers，但我对Action Listeners感到困惑。我在哪里创建ActionListener类？我会把它放在里面？
import java.awt.Rectangle;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JComponent;
import javax.swing.JFrame;
import java.awt.Robot;
import java.awt.AWTException;
import java.util.*;
import javax.swing.Timer;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class RightRobotTest
{
public static void main (String[] args)
{
JFrame rightFrame = new JFrame();
rightFrame.setSize(600, 400);
rightFrame.setTitle("Right Robot");
rightFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
RightMazeComponent Rcomponent = new RightMazeComponent();
rightFrame.add(Rcomponent);
rightFrame.setLocationRelativeTo(null);
rightFrame.setVisible(true);
/* //Timer
Timer timer = new Timer(5000, actionPerfromed());
timer.start();
try{
Thread.sleep(5000);
}
catch (InterruptedException e)
{
}
timer.stop();
*/
}
}
class RightMazeComponent extends JComponent
{
public void paintComponent(Graphics g)
{
Graphics2D g2 = (Graphics2D) g;
int[][] outline ={
{1, 1, 1, 1, 1, 1, 1},
{0, 0, 1, 1, 1, 0, 0},
{1, 0, 1, 1, 0, 0, 1},
{1, 0, 1, 1, 0, 1, 1},
{1, 0, 0, 0, 0, 1, 1},
{1, 1, 0, 1, 0, 0, 1},
{1, 1, 0, 1, 0, 1, 1},
{1, 1, 1, 1, 1, 1, 1} };
MazeBuilder original = new MazeBuilder(outline);
original.draw(g2);
Rectangle robot2 = new Rectangle (70, 20, 10, 10);
g2.setColor(Color.RED);
g2.draw(robot2);
int rPos = 1;
int cPos = 0;
int count2 = 0;
//Right robot
boolean rightFinish = true;
int lastmove = 4;
int Rchoice = original.MoveRightRobot(rPos, cPos);
String move = "";
int value = 0;
while(rightFinish)
{
move = Integer.toString(Rchoice) + Integer.toString(lastmove);
value = Integer.parseInt(move);
System.out.println(value);
switch (value)
{
//down
case 14:
case 11:
case 12:
case 10:
robot2.translate(0, 50);
g2.draw(robot2);
cPos++;
Rchoice = original.MoveRightRobot(rPos,cPos);
lastmove = 0;
count2++;
break;
//right
case 24:
case 21:
// case 23:
case 20:
robot2.translate(50,0);
g2.draw(robot2);
rPos++;
Rchoice = original.MoveRightRobot(rPos,cPos);
lastmove = 1;
count2++;
break;
//left
case 30:
case 31:
case 32:
case 33:
case 34:
robot2.translate(-50, 0);
g2.draw(robot2);
rPos--;
Rchoice = original.MoveRightRobot(rPos,cPos);
lastmove = 2;
count2++;
break;
//up
case 40:
case 41:
case 42:
case 43:
case 44:
robot2.translate(0, -50);
g2.draw(robot2);
cPos--;
Rchoice = original.MoveRightRobot(rPos,cPos);
lastmove = 3;
count2++;
break;
//special cases
case 23:
if(original.MoveLeft(rPos,cPos) == true)
{
robot2.translate(-50, 0);
g2.draw(robot2);
rPos--;
Rchoice = original.MoveRightRobot(rPos,cPos);
lastmove = 2;
count2++;
break;
}
else if(original.MoveRight(rPos, cPos) == true)
{
robot2.translate(50,0);
g2.draw(robot2);
rPos++;
Rchoice = original.MoveRightRobot(rPos,cPos);
lastmove = 1;
count2++;
break;
}
else
{
robot2.translate(0, -50);
g2.draw(robot2);
cPos--;
Rchoice = original.MoveRightRobot(rPos,cPos);
lastmove = 3;
count2++;
break;
}
case 22:
if(original.MoveDown(rPos, cPos) == true)
{
robot2.translate(0, 50);
g2.draw(robot2);
cPos++;
Rchoice = original.MoveRightRobot(rPos,cPos);
lastmove = 0;
count2++;
break;
}
else if(original.MoveLeft(rPos, cPos) == true)
{
robot2.translate(-50, 0);
g2.draw(robot2);
rPos--;
Rchoice = original.MoveRightRobot(rPos,cPos);
lastmove = 2;
count2++;
break;
}
else
{
robot2.translate(0, -50);
g2.draw(robot2);
cPos--;
Rchoice = original.MoveRightRobot(rPos,cPos);
lastmove = 3;
count2++;
break;
}
}//Switch end
if(cPos == 6)
{
rightFinish = false;
System.out.println("RIGHT ROBOT FINISH");
}
if(count2 == 25)
{
rightFinish = false;
System.out.println("Right Robot Error.");
}
}
}
//BUILDS MAZE AND INCLUDES METHODS THAT CHECK WHAT MOVES ARE FREE
class MazeBuilder
{
int[][] outline ={
{1, 1, 1, 1, 1, 1, 1},
{0, 0, 1, 1, 1, 0, 0},
{1, 0, 1, 1, 0, 0, 1},
{1, 0, 1, 1, 0, 1, 1},
{1, 0, 0, 0, 0, 1, 1},
{1, 1, 0, 1, 0, 0, 1},
{1, 1, 0, 1, 0, 1, 1},
{1, 1, 1, 1, 1, 1, 1} };
public MazeBuilder(int[][] maze)
{
}
public void draw(Graphics2D g2)
{
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 7; j++)
{
/*if (outline[i][j] == 2)
{
Rectangle robot = new Rectangle( i, j*50, 50, 50);
g2.draw(block);
}*/
if (outline[i][j] == 1)
{
Rectangle wall = new Rectangle( i*50, j*50, 50, 50);
g2.draw(wall);
g2.fill(wall);
}
}
}
}
int rowpos = 1;
int colpos = 1;
boolean down = true;
boolean up = true;
boolean left = true;
boolean right = true;
public boolean MoveDown(int rowpos, int colpos)
{
if(colpos != 6 && outline[rowpos][colpos+1] == 0)
{
return true;
}
else
{
return false;
}
}
public boolean MoveUp(int rowpos, int colpos)
{
if (colpos != 0 && outline[rowpos][colpos - 1] == 0)
{
return true;
}
else
{
return false;
}
}
public boolean MoveLeft(int rowpos, int colpos)
{
if (rowpos != 0 && outline[rowpos - 1][colpos] == 0)
{
return true;
}
else
{
return false;
}
}
public boolean MoveRight(int rowpos, int colpos)
{
if( outline[rowpos + 1][colpos] == 0)
{
return true;
}
else
{
return false;
}
}
//RETURNS VALUE AS TO WHICH DIRECTION ROBOT SHOULD MOVE
public int MoveRightRobot(int rPos, int cPos)
{
boolean down = MoveDown(rPos,cPos);
boolean up = MoveUp(rPos, cPos);
boolean left = MoveLeft(rPos, cPos);
boolean right = MoveRight(rPos, cPos);
int RC = 7;
if(right == true)
{
RC = 2;
}
else if (down == true)
{
RC = 1;
}
else if (left == true)
{
RC = 3;
}
else if (up == true)
{
RC = 4;
}
return RC;
}
}
}
答案 0 :(得分：2)
在问题中发布了太多代码来研究和调整它。相反，如果你想让你的机器人穿过迷宫，你可以在这里高级概述。
你想要一种循环：
想要使用Swing Timer，你走在正确的轨道上。如果你想要每秒更新一次机器人的位置，你会写一个Timer来做：
Timer timer = new Timer( 1000, action -> {
newPosition = calculateNewPosition();
setNewPositionOfRobotInMaze( maze, newPosition);
maze.repaint();
if ( robotReachedEnd() ){
((Timer)action.getSource()).stop();
}
});
timer.setRepeats( true );
timer.start();
每经过一秒钟，计时器将被触发，而计时器将触发动作监听器。动作监听器中的代码将更新机器人位置并要求迷宫进行重新绘制。
您可能还想阅读Swing concurrency guide，这清楚地解释了为什么您甚至不应该将Thread.sleep与Swing代码结合使用的尝试。
答案 1 :(得分：-1)
Timer t = new Timer();
t.scheduleAtFixedRate(new TimerTask() {
//code here
}, 1000, 0);
计时器scheduleAtFixedRate方法参数： TimerTask - 包含代码; 延迟 - 每次运行之间; startDelay - 如果它应该在启动计时器之前延迟（运行一次）
答案 2 :(得分：-2)
您可以将新的Java 8 lambda表达式用于句柄计时器事件
Timer timer = new Timer(5000, action -> {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
}
});