JDK5新特性_枚举类的常见方式

我不是女神ヾ 2022-06-17 03:36 176阅读 0赞

package cn.itcast_02;
    
    public class EnumMethodDemo {
    	public static void main(String[] args) {
    		// int compareTo(E o):比较枚举谁前谁后
    		Direction2 d21 = Direction2.FRONT;
    		Direction2 d22 = Direction2.BEHIND;
    		Direction2 d23 = Direction2.LEFT;
    		Direction2 d24 = Direction2.RIGHT;
    		System.out.println(d21.compareTo(d21));
    		System.out.println(d21.compareTo(d24));
    		System.out.println(d24.compareTo(d21));
    		System.out.println("------------------");
    		// String name():获取枚举项名称
    		System.out.println(d21.name());
    		System.out.println(d22.name());
    		System.out.println(d23.name());
    		System.out.println(d24.name());
    		System.out.println("------------------");
    		// int ordinal():获取枚举项编号
    		System.out.println(d21.ordinal());
    		System.out.println(d22.ordinal());
    		System.out.println(d23.ordinal());
    		System.out.println(d24.ordinal());
    		System.out.println("------------------");
    		// String toString():获取枚举项的字符串表示名
    		System.out.println(d21.toString());
    		System.out.println(d22.toString());
    		System.out.println(d23.toString());
    		System.out.println(d24.toString());
    		System.out.println("------------------");
    		// static <T> T valueOf(Class<T> type,String name):在字节码文件中,得到某个指定的枚举项
    		Direction2 d = Enum.valueOf(Direction2.class, "LEFT");
    		System.out.println(d.getName());
    		System.out.println("------------------");
    		// values():此方法虽然在JDK文档中查找不到，但每个枚举类都具有该方法，它遍历枚举类的所有枚举值非常方便
    		Direction2[] dire = Direction2.values();
    		for (Direction2 dd : dire) {
    			System.out.println(dd);
    			System.out.println(dd.getName());
    		}
    	}
    }