JDK5新特性_通过enum实现枚举类

电玩女神 2022-06-17 03:28 201阅读 0赞

package cn.itcast_02;
    
    public class DirectionDemo {
    	public static void main(String[] args) {
    		Direction d = Direction.FRONT;
    		System.out.println(d);// FRONT
    		// public String toString()返回枚举常量的名称，它包含在声明中。
    		System.out.println("-------------------------");
    		System.out.println("-------------------------");
    		Direction2 d2 = Direction2.FRONT;
    		System.out.println(d2);
    		System.out.println(d2.getName());
    		System.out.println("-------------------------");
    		Direction3 d3 = Direction3.LEFT;
    		System.out.println(d3);
    		System.out.println(d3.getName());
    		d3.show();
    	}
    }

package cn.itcast_02;
    
    /*
     * 通过JDK5提供的枚举类来做枚举类
     */
    public enum Direction {
    	FRONT, BEHIND, LEFT, RIGHT;
    }

package cn.itcast_02;
    
    /*
     * 通过JDK5提供的枚举类来做枚举类
     */
    public enum Direction2 {
    	FRONT("前"), BEHIND("后"), LEFT("左"), RIGHT("右");
    
    	private Direction2(String name) {
    		this.name = name;
    	}
    
    	private String name;
    
    	public String getName() {
    		return name;
    	}
    }

package cn.itcast_02;
    
    /*
     * 通过JDK5提供的枚举类来做枚举类
     */
    public enum Direction3 {
    	FRONT("前") {
    		@Override
    		public void show() {
    			System.out.println("前");
    		}
    	},
    	BEHIND("后") {
    		@Override
    		public void show() {
    			System.out.println("前");
    		}
    	},
    	LEFT("左") {
    		@Override
    		public void show() {
    			System.out.println("左");
    		}
    	},
    	RIGHT("右") {
    		@Override
    		public void show() {
    			System.out.println("右");
    		}
    	};
    
    	private Direction3(String name) {
    		this.name = name;
    	}
    
    	private String name;
    
    	public String getName() {
    		return name;
    	}
    
    	public abstract void show();
    }