枚举enum

 

 

 

 例子：

package package1;

// file->new module
enum color{
    RED,BLUE,YELLOW;
}
enum direction{
    UP,DOWN,RIGHT,LEFT;
}
public class he {

    public static void see(color c){
        switch(c) {
            case RED:
                c = color.RED;
                break;
            case YELLOW:
                c = color.YELLOW;
                break;
            case BLUE:
               c = color.BLUE;
                break;
        }

    }
    public static void DI(direction d){
        switch(d) {
            case UP:
               System.out.println("up");
                break;
            case DOWN:
                System.out.println("down");
                break;
            
        }

    }
}

枚举的常用方法见这篇：Java枚举（enum）详解：Java声明枚举类型、枚举（enum）类、EnumMap 与 EnumSet (biancheng.net)