Java switch语句给出错误：“Boolean不能转换为int”

Question

所以我试图使用switch语句为位置x和位置y设置边界。我已经在下面提供了我的代码和错误信息。另外，我刚接触java，所以对我来说这可能是一个愚蠢的问题，但老实说，我目前不知道更好的问题。

public class Point{
    // Define instance variables
    private int posX;
    private int posY;
    
    //Constructor for object Point
    public Point(int x, int y){
        posX = x;
        posY = y;
    }
    //toString
    public String toString() {
   String point = null;
   point = "(" + posX + " , " + posY + ")";
   return point;
}
    //move method
    public void move(int x, int y){
        int tmpX = posX + x;
        int tmpY = posY + y;
        
        switch (tmpX){
            case tmpX > 100:
                posX = 100;
                break;
            case tmpX < 0:
                posX = 0;
                break;
            default:
                posX = posX + x;
        }
        switch (tmpY){
        case tmpY > 100:
                posY = 100;
                break;
            case tmpY < 0:
                posY = 0;
                break;
            default:
                posY = posY + y;
        }
    }
}

Point.java:23: error: incompatible types: boolean cannot be converted to int
            case tmpX > 100:
                      ^
Point.java:26: error: incompatible types: boolean cannot be converted to int
            case tmpX < 0:
                      ^
Point.java:33: error: incompatible types: boolean cannot be converted to int
        case tmpY > 100:
                  ^
Point.java:36: error: incompatible types: boolean cannot be converted to int
            case tmpY < 0:
                      ^
4 errors

Answer 1

代替此开关：

switch (tmpY){
case tmpY > 100:
    posY = 100;
    break;
case tmpY < 0:
    posY = 0;
    break;
default:
    posY = posY + y;
}

使用if-else：

if (tmpY > 100) {
    posY = 100;
} else if (tmpY < 0) {
    posY = 0;
} else {
    posY = posY + y;
}