我在 java 小程序中做两辆车之间的小比赛。只有两张图片以随机速度移动。我正在计算当前位置和终点线之间的距离，并且您应该能够看到上角的距离。
问题是我无法刷新文本字段，而是在旧数字之上应用了一个新图层，因此几乎无法阅读。这里有图片来证明我的问题。
我以为我可以通过在每个循环开始时创建蓝色矩形来解决它，但这似乎并没有解决它。
public void action(){
Random rand = new Random();
boolean race = true;
int x1 =500, y1 = 233;
int x2 = 500, y2 = 333;
int speed1 = rand.nextInt(15) + -16;
int speed2 = rand.nextInt(15) + -16;
int finishline = 30;
Text winnerBlue = new Text("Winner: BLUE",new Font("SansSerif",Font.BOLD,20), Color.blue,Color.white);
Text winnerRed = new Text("Winner: RED",new Font("SansSerif",Font.BOLD,20), Color.red,Color.white);
//background
Text text =null;
Text text2 = null;
window.fillRect(0, 0, 600, 400, Color.GREEN);
//track 1
window.fillRect(20, 330, 550, 39, Color.gray);
//track2
window.fillRect(20, 230, 550, 39, Color.gray);
//Finish line
window.fillRect(40, 210, 10, 180, Color.BLACK);
while(race){
text = new Text(Integer.toString(x1),new Font("Courier",Font.BOLD,20), Color.WHITE);
text2 = new Text(Integer.toString(x2),new Font("SansSerif",Font.BOLD,20), Color.WHITE);
window.fillRect(0, 0, 70, 50, Color.blue);
window.fillRect(70, 0, 70, 50, Color.red);
window.showImage(text, 0, 0);
window.showImage(text2, 70, 0);
window.showImage(car1.getImage(), x1, y1);
window.showImage(car2.getImage(), x2, y2);
car1.moveTo(x1 += speed1, y1);
car2.moveTo(x2 += speed2, y2);
window.pause(50);
if(x1 <= (finishline ) ){
speed1 = 0;
speed2 = 0;
window.showImage(winnerBlue, 200, 200);
race = false;
}
if(x2 <= (finishline)){
speed2 = 0;
speed1 = 0;
window.showImage(winnerRed, 200, 200);
race = false;
}
}
}
}