这是一个枚举类Day.java
public enum Day {
MONDAY("星期一"),
TUESDAY("星期二"),
WEDNESDAY("星期三"),
THURSDAY("星期四"),
FRIDAY("星期五"),
SATURDAY("星期六"),
SUNDAY("星期天"); /**
* 中文描述
*/
private String desc; public String getDesc() {
return desc;
} /**
* 私有构造方法,防止被外部调用
* @param desc
*/
private Day(String desc) {
this.desc = desc;
} }
进入到这个文件目录下编译该文件:javac -encoding UTF-8 Day.java
这时候,该目录会有一个Day.class编译后的字节码文件;
再执行:javap -p Day.class
Compiled from "Day.java"
public final class Day extends java.lang.Enum<Day> {
public static final Day MONDAY;
public static final Day TUESDAY;
public static final Day WEDNESDAY;
public static final Day THURSDAY;
public static final Day FRIDAY;
public static final Day SATURDAY;
public static final Day SUNDAY;
private java.lang.String desc;
private static final Day[] $VALUES;
public static Day[] values();
public static Day valueOf(java.lang.String);
public java.lang.String getDesc();
private Day(java.lang.String);
static {};
}
可以看到,public enum Day定义一个枚举类,反编译之后看到public final class Day extends java.lang.Enum<Day>Java枚举类不能被继承;
每一个枚举都是public static final只能被赋值一次,大概就是这些,如果想看更加详细的反编译可执行:javap -c Day (这里不要写文件后缀.class);
反编译可以输出常量池的信息以及元素个数:javap -verbose Day.class
Java枚举的简单例子:https://www.cnblogs.com/theRhyme/p/9996966.html