Java enum枚举详解

public enum  EnumTest1 {
    MON, TUE, WED, THU, FRI, SAT, SUN;
}

public class TestMain {
 
    public static void main(String[] args) {
        // 返回枚举常量的名称
        for (EnumTest1 e : EnumTest1.values()){
            System.out.println(e.toString());
        }
 
        // compareTo()
        EnumTest1 test = EnumTest1.MON;
        System.out.println(""+test.compareTo(EnumTest1.FRI));
        boolean i = test.compareTo(EnumTest1.FRI) > 0;
        if (i == false) {
            System.out.println("MON 在 FRI之前");
 
        } else if (i == true) {
            System.out.println("MON 在 FRI之后");
 
        }
 
        //getDeclaringClass()
        System.out.println("getDeclaringClass(): " + test.getDeclaringClass().getName());
 
        //name() 和  toString()
        System.out.println("name(): " + test.name());
        System.out.println("toString(): " + test.toString());
 
        //ordinal()， 返回值是从 0 开始
        System.out.println("ordinal(): " + test.ordinal());
    }
}
 
//打印输出-----------------------------------------------------------------------------------------------
 
MON
TUE
WED
THU
FRI
SAT
SUN
-4
MON 在 FRI之前
getDeclaringClass(): com.Enumc.EnumTest1
name(): MON
toString(): MON
ordinal(): 0

public enum EnumTest2 {
 
    MON(1), TUE(2), WED(3), THU(4), FRI(5){
        @Override
        public boolean isRest() {
            return true;
        }
    }, SAT(6), SUN(7){
        @Override
        public boolean isRest() {
            return true;
        }
    };
 
 
    private int value;
 
    EnumTest2(int value) {
        this.value = value;
    }
 
    public int getValue() {
        return value;
    }
 
    public boolean isRest(){
        return false;
    }
}

public class TestMain2 {
 
    public static void main(String[] args) {
        System.out.println("EnumTest.FRI 的 value = " + EnumTest2.FRI.getValue());
    }
}
 
// 打印输出
EnumTest.FRI 的 value = 5

FRI:星期五