Java 枚举类和自定义枚举类和enum声明及实现接口的操作

//自定义枚举类
class Season {
 //1.提供类的属性，声明为private final
 private final String seasonName;
 private final String seasonDesc;
 //2.声明为final的属性，在构造器中初始化
 private Season(String seasonName,String seasonDesc) {
 this.seasonName = seasonName;
 this.seasonDesc = seasonDesc;
 }
 //3.通过公共的方法来调用属性
 public final String getSeasonName() {
 return seasonName;
 }
 public final String getSeasonDesc() {
 return seasonDesc;
 }
 //4.创建枚举类的对象:将类的对象声明为public static final
 public static final Season SPRING = new Season("春天", "春暖花开");
 public static final Season SUMMER = new Season("夏天", "夏日炎炎");
 public static final Season FALL = new Season("秋天", "硕果累累");
 public static final Season WINTER = new Season("冬天", "白雪皑皑");
  
 @Override
 public String toString() {
 return "Season [seasonName=" + seasonName + ", seasonDesc=" + seasonDesc + "]";
 }
 public void show() {
 System.out.println("这个一个季节");
 }
}

public static void main(String[] args) {
 Season spring = Season.SPRING;
 System.out.println(spring);
 spring.show();
 System.out.println(spring.getSeasonName() +" "+spring.getSeasonDesc());
 }
}

interface info{
 void show();
}
//枚举类
enum Season1 implements info{
 SPRING("春天", "春暖花开"){
 public void show() {
 System.out.println("春天在哪里？");
 }
 },
 SUMMER("夏天", "夏日炎炎")
 {
 public void show() {
  System.out.println("生如夏花");
 }
 } ,
 AUTUTO("秋天", "硕果累累")
 {
 public void show() {
  System.out.println("秋天是用来分手的季节");
 }
 },
 WINTER("冬天", "白雪皑皑")
 {
 public void show() {
  System.out.println("冬天里的一把火");
 }
 };
 
 //1.提供类的属性，声明为private final
 private final String seasonName;
 private final String seasonDesc;
 //2.声明为final的属性，在构造器中初始化
 private Season1(String seasonName,String seasonDesc) {
 this.seasonName = seasonName;
 this.seasonDesc = seasonDesc;
 }
 //3.通过公共的方法来调用属性
 public final String getSeasonName() {
 return seasonName;
 }
 public final String getSeasonDesc() {
 return seasonDesc;
 }
 
 @Override
 public String toString() {
 return "Season [seasonName=" + seasonName + ", seasonDesc=" + seasonDesc + "]";
 }
// public void show() {
// System.out.println("这个一个季节");
// }
}

public class TestEnum {
 public static void main(String[] args) {
 System.out.println("------------enum关键字");
 //1.values()：返回枚举类数组
 Season1 [] seasons = Season1.values();
 for(int i = 0; i < seasons.length;i++) {
  System.out.println(seasons[i]);
 }
 //2.valueOf(String name):要求传入的形参name是枚举对象的名字
 //否则：报java.lang.IllegalArgumentException异常
 String str = "SPRING";
 Season1 sea = Season1.valueOf(str);
 System.out.println(sea);
 //线程的运行状态
 Thread.State[] states = Thread.State.values();
 for (int i = 0; i < states.length; i++) {
  System.out.println(states[i]);
 } 
 }
}

enum ClassName
{
}

public class Person
{
   @Override // 如果该方法覆写正确，不会有编译错误。如果方法名，参数列表与父类中同名方法不同，则会报错。
  public String toString()
  {
  }
}

@Deprecated
public Void fun() {}

interface Imessage
{
  public default void fun()   //追加普通方法，有方法体
  {
    System.out.println("Holle IMessage");
  }
  
  public static IMessage getInstance()  //可以由接口名称直接调用
  {
    return new MessageImp();
  }
  public void print();
}
class MessageImp imlements Imessage
{
  @Override
  public void print()
  {
    System.out.println("Holle MessageImp ");
  }
}