java之枚举类

Posted 2022-12-06 爸爸去哪了2之熊猫三胞胎

java之枚举类

枚举类：

使用自定义创建枚举类

public class TestEnum 
    public static void main(String[] args) 
        Season season1=Season.SPRING1;
        System.out.println(season1);
        System.out.println(season1.getSeasonName());

    

//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;
    //声明为final的属性，在构造器中初始化
    private Season(String seasonName,String seasonDesc) 
        this.seasonDesc=seasonDesc;
        this.seasonName=seasonName;
    
    //3.通过公共的方法来调用属性
    public String getSeasonName() 
        return seasonName;
    
    public String getSeasonDesc() 
        return seasonDesc;
    

    @Override
    public String toString() 
        return "Season [seasonName=" + seasonName + ", seasonDesc=" + seasonDesc + "]";
    


    //4.创建枚举类的对象
    public static final Season SPRING1=new Season("seasonName1", "seasonDesc1");
    public static final Season SPRING2=new Season("seasonName2", "seasonDesc2");
    public static final Season SPRING3=new Season("seasonName3", "seasonDesc3");
    public static final Season SPRING4=new Season("seasonName4", "seasonDesc4");

使用enum创建枚举类

public class TestEnum 
    public static void main(String[] args) 
        Season season1=Season.SPRING1;
        System.out.println(season1);
        System.out.println(season1.getSeasonName());

        //enum中的方法1
        System.out.println(Season.values());
        for (int i = 0; i < Season.values().length; i++) 
            System.out.println(Season.values()[i]);
        

        //enum中的方法2  需要传入的是枚举类的名字，否则就会报错
        String str="SPRING1";
        Season sea=Season.valueOf(str);
        System.out.println(sea);

    

//枚举类
enum Season
    //1.创建枚举类的对象
    SPRING1("seasonName1", "seasonDesc1"),
    SPRING2("seasonName2", "seasonDesc2"),
    SPRING3("seasonName3", "seasonDesc3"),
    SPRING4("seasonName4", "seasonDesc4");

    private final String seasonName;
    private final String seasonDesc;

    private Season(String seasonName,String seasonDesc) 
        this.seasonDesc=seasonDesc;
        this.seasonName=seasonName;
    

    public String getSeasonName() 
        return seasonName;
    
    public String getSeasonDesc() 
        return seasonDesc;
    

    @Override
    public String toString() 
        return "Season [seasonName=" + seasonName + ", seasonDesc=" + seasonDesc + "]";