JDK5新特性_自己实现枚举类

Love The Way You Lie 2022-06-17 03:28 179阅读 0赞

package cn.itcast_01;
    
    public class DirectionDemo {
    	public static void main(String[] args) {
    		Direction d = Direction.FRONT;
    		System.out.println(d);// cn.itcast_01.Direction@6bbc4459
    		System.out.println("------------------------");
    		Direction2 d2 = Direction2.FRONT;
    		System.out.println(d2);// cn.itcast_01.Direction2@5d888759
    		System.out.println(d2.getName());
    		System.out.println("------------------------");
    		Direction3 d3 = Direction3.FRONT;
    		System.out.println(d3);
    		System.out.println(d3.getName());
    		d3.show();
    
    		d3 = Direction3.LEFT;
    		System.out.println(d3);
    		System.out.println(d3.getName());
    		d3.show();
    	}
    }

package cn.itcast_01;
    
    public class Direction {
    	// 创建几个实例
    	public static final Direction FRONT = new Direction();
    	public static final Direction BEHIND = new Direction();
    	public static final Direction LEFT = new Direction();
    	public static final Direction RIGHT = new Direction();
    
    	// 私有构造
    	private Direction() {
    
    	}
    }

package cn.itcast_01;
    
    public class Direction2 {
    	// 创建几个实例
    	public static final Direction2 FRONT = new Direction2("前");
    	public static final Direction2 BEHIND = new Direction2("后");
    	public static final Direction2 LEFT = new Direction2("左");
    	public static final Direction2 RIGHT = new Direction2("右");
    
    	// 私有构造
    	// private Direction2() {
    	//
    	// }
    	private Direction2(String name) {
    		this.name = name;
    	}
    
    	private String name;
    
    	public String getName() {
    		return name;
    	}
    }

package cn.itcast_01;
    
    public abstract class Direction3 {
    	// 创建几个实例
    	public static final Direction3 FRONT = new Direction3("前") {
    		@Override
    		public void show() {
    			System.out.println("前");
    
    		}
    	};
    	public static final Direction3 BEHIND = new Direction3("后") {
    		@Override
    		public void show() {
    			System.out.println("后");
    		}
    	};
    	public static final Direction3 LEFT = new Direction3("左") {
    		@Override
    		public void show() {
    			System.out.println("左");
    		}
    	};
    	public static final Direction3 RIGHT = new Direction3("右") {
    		@Override
    		public void show() {
    			System.out.println("右");
    		}
    	};
    
    	// 私有构造
    	// private Direction2() {
    	//
    	// }
    	private Direction3(String name) {
    		this.name = name;
    	}
    
    	private String name;
    
    	public String getName() {
    		return name;
    	}
    
    	public abstract void show();
    }