java枚举enum

java枚举

jdk5.0之前的

public class SessonTest {
    public static void main(String[] args) {
        Seasson spring = Seasson.Spring;
        System.out.println(spring);
    }
}

class Seasson{
    //1.
    private final String seassonName;
    private final String seassonDesc;
    //2.
    private Seasson(String seassonName, String seassonDesc){
        this.seassonName = seassonName;


        this.seassonDesc = seassonDesc;
    }

    //3.提供枚举类的多个对象
    public static final Seasson Spring = new Seasson("春天","美丽");

    //4.
    public String getSeassonName() {
        return seassonName;
    }

    public String getSeassonDesc() {
        return seassonDesc;
    }

    //4.
    @Override
    public String toString() {
        return "Seasson{" +
                "seassonName='" + seassonName + '\'' +
                ", seassonDesc='" + seassonDesc + '\'' +
                '}';
    }
}

jdk5.0之后

import java.lang.reflect.Array;
import java.util.Arrays;

/*
enum的方法
1.values：所有的枚举类元素
2.valueOf：根据提供的objName返回同名的枚举类元素,如果没有的话抛异常
3.toString：

1.实现接口
2.
 */
public class enumTestDemo {
    public static void main(String[] args) {
        Seasson1 spring = Seasson1.Spring;
        System.out.println(spring);//Spring


        Seasson1[] values = Seasson1.values();
        System.out.println(Arrays.toString(values));//[Spring, Summer]
        for(int i = 0;i < values.length;i++){
            values[i].show();
        }

        Thread.State[] values1 = Thread.State.values();
        System.out.println(Arrays.toString(values1));//[NEW, RUNNABLE, BLOCKED, WAITING, TIMED_WAITING, TERMINATED]

        Seasson1 spring1 = Seasson1.valueOf("Spring");
        System.out.println(spring1);//Spring
        spring1.show();
        Seasson1 summer = Seasson1.valueOf("Summer");
        summer.show();
    }
}
interface Info{
    void show();
}
enum  Seasson1 implements Info{
    Spring("春天","美丽"){
        @Override
        public void show() {
            System.out.println("春天美丽");
        }
    },
    Summer("夏天","清爽"){
        @Override
        public void show() {
            System.out.println("夏天清爽");
        }
    };
    //1.
    private final String seassonName;
    private final String seassonDesc;
    //2.

    private Seasson1(String seassonName, String seassonDesc){
        this.seassonName = seassonName;


        this.seassonDesc = seassonDesc;
    }
    //3.提供枚举类的多个对象

    //4.
    public String getSeassonName() {
        return seassonName;
    }

    public String getSeassonDesc() {
        return seassonDesc;
    }

    //4.
//    @Override
//    public String toString() {
//        return "Seasson1{" +
//                "seassonName='" + seassonName + '\'' +
//                ", seassonDesc='" + seassonDesc + '\'' +
//                '}';
//    }

//    @Override
//    public void show() {
//        System.out.println("这是一个季节");
//    }
}