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"); // } }