在坦克大战中,实现八个方向的移动的时候,使用枚举类型,编译器却报错,直接上代码。
import java.awt.*;
import java.awt.event.*;
public class Tank {
public static final int XSPEED = 5;
public static final int YSPEED = 5;
private int x, y;
private boolean bL=false, bU=false, bR=false, bD = false;
enum Direction {L, LU, U, RU, R, RD, D, LD, STOP};//这个地方不知道为什么报错。
private Direction dir = Direction.STOP;//这里也是。
public Tank(int x, int y) {
this.x = x;
this.y = y;
}
public void draw(Graphics g) {
Color c = g.getColor();
g.setColor(Color.RED);
g.fillOval(x, y, 30, 30);
g.setColor(c);
move();
}
void move() {
switch(dir) {
case L:
x -= XSPEED;
break;
case LU:
x -= XSPEED;
y -= YSPEED;
break;
case U:
y -= YSPEED;
break;
case RU:
x += XSPEED;
y -= YSPEED;
1 break;
case R:
x += XSPEED;
break;
case RD:
x += XSPEED;
y += YSPEED;
break;
case D:
y += YSPEED;
break;
case LD:
x -= XSPEED;
y += YSPEED;
break;
case STOP:
break;
}
}
public void keyPressed(KeyEvent e) {
int key = e.getKeyCode();
switch(key) {
case KeyEvent.VK_LEFT :
bL = true;
break;
case KeyEvent.VK_UP :
bU = true;
break;
case KeyEvent.VK_RIGHT :
bR = true;
break;
case KeyEvent.VK_DOWN :
bD = true;
break;
}
locateDirection();
}
void locateDirection() {
if(bL && !bU && !bR && !bD) dir = Direction.L;
else if(bL && bU && !bR && !bD) dir = Direction.LU;
else if(!bL && bU && !bR && !bD) dir = Direction.U;
else if(!bL && bU && bR && !bD) dir = Direction.RU;
else if(!bL && !bU && bR && !bD) dir = Direction.R;
else if(!bL && !bU && bR && bD) dir = Direction.RD;
else if(!bL && !bU && !bR && bD) dir = Direction.D;
else if(bL && !bU && !bR && bD) dir = Direction.LD;
else if(!bL && !bU && !bR && !bD) dir = Direction.STOP;
}
}
------解决思路----------------------
case RU:
x += XSPEED;
y -= YSPEED;
1 break;
这边多了个1