Java枚举 自定义枚举 通过enum关键字定义枚举 实现接口 枚举的方法

1. 自定义枚举类

   public class TestEnum1 {
   	public static void main(String[] args) {
   		
   		Person man = Person.MAN;
   		System.out.println(man.toString());
   		Person woman = Person.WOMAN;
   		System.out.println(woman);
   	}
   }
   //自定义枚举类型
   class Person{
   	//1 属性私有化
   	private final String name;
   	private final int age;
   	//2 构造器私有 化
   	private Person(String name,int age) {
   		this.name = name;
   		this.age = age;
   	}
   	//3 创建对象 
   	public final static Person MAN = new Person("小明",20);
   	public final static Person WOMAN = new Person("小花",23);
   	@Override
   	public String toString() {
   		return "Person [name=" + name + ", age=" + age + "]";
   	}
   }
   

    

2. 通过enum关键字定义枚举

   public class TestEnum2 {
   	public static void main(String[] args) {
   		Person1 man = Person1.MAN;
   		System.out.println(man.info());
   		Person1 woman = Person1.WOMAN;
   		System.out.println(woman.info());
   	}
   }
   enum Person1{
   	MAN("小明",20),
   	WOMAN("小花",24);
   	//1 属性私有化
   	private final String name;
   	private final int age;
   	//2 构造器私有 化
   	
   	private Person1(String name,int age) {
   		this.name = name;
   		this.age = age;
   	}
   	public String info() {
   		return "Person1 [name=" + name + ", age=" + age + "]";
   	}
   }
   

   注意：创建对象必须放在最枚举类的最前面

3. 如何实现接口

   interface Interface1{
   	void show();
   }
   enum Person1 implements Interface1{
   	MAN("小明",20){
   		public void show() {
   			System.out.println("男人");
   		}
   	},
   	WOMAN("小花",24){
   		public void show() {
   			System.out.println("女人");
   		}
   	};
   	//1 属性私有化
   	private final String name;
   	private final int age;
   	//2 构造器私有 化
   	
   	private Person1(String name,int age) {
   		this.name = name;
   		this.age = age;
   	}
   	public String info() {
   		return "Person1 [name=" + name + ", age=" + age + "]";
   	}
   	@Override
   	public void show() {
   		System.out.println("这是人类");
   		
   	}
   }
   

    

4. 枚举中方法使用

   //两个常用的方法 values()  valueOf(String)
   		//values()获取枚举类中的所有对象 
   		Person1[] ps = Person1.values();
   		for(Person1 p : ps) {
   			System.out.println(p.info());
   		}
   		System.out.println("=============");
   		//valueOf(对象字符串)获取其中一个
   		Person1 p1 = Person1.valueOf("MAN");
   		System.out.println(p1.info());
   		Person1 p2 = Person1.valueOf("WOMAN");
   		System.out.println(p2.info());