JAVA枚举类的简单使用

摘要: 枚举类型是Java 5中新增特性的一部分，它是一种特殊的数据类型。枚举类型具有的简洁、安全以及便捷等特点。

枚举类简介

枚举类型是Java 5中新增特性的一部分，它是一种特殊的数据类型。之所以特殊是因为它既是一种类(class)类型却又比类类型多了些特殊的约束，但是这些约束的存在也造就了枚举类型的简洁性、安全性以及便捷性。

枚举类的简单应用

1、常量的使用

enum Day {
MON, TUE, WED,
THU, FRI, SAT, SUN
}

public class Mian01 {

public static void main(String[] args) {
// 直接引用
Day day01 = Day.MON;
Day day02 = Day.THU;
Day day03 = Day.SUN;

System.out.println("-----------------toString()-------------------");
// 1、toString
System.out.println(day01.toString());
System.out.println(day02.toString());
System.out.println(day03.toString());

System.out.println("-----------------ordinal()-------------------");
// 2、ordinal()
System.out.println(day01.ordinal());
System.out.println(day02.ordinal());
System.out.println(day03.ordinal());

System.out.println("------------------name()--------------------");
// 3、name()
System.out.println(day01.name());
System.out.println(day02.name());
System.out.println(day03.name());

System.out.println("-----------------compareTo()------------------");
// 4、compareTo()
System.out.println(day01.compareTo(day01));
System.out.println(day01.compareTo(day02));
System.out.println(day03.compareTo(day01));
}
}

打印结果：

2、自定义函数

public enum Day {
MON("星期一", 1), TUE("星期二", 2), WED("星期三", 3),
THU("星期四", 4), FRI("星期五", 5), SAT("星期六", 6), SUN("星期日", 7);

private String chineseName;
private int number;

private Day(String chineseName, int number){
this.chineseName = chineseName;
this.number = number;
}

//重写toSting()
@Override
public String toString() {
return "chineseName:"+chineseName+" & number:"+number;
}

public String getChineseName() {
return chineseName;
}

public void setChineseName(String chineseName) {
this.chineseName = chineseName;
}

public int getNumber() {
return number;
}

public void setNumber(int number) {
this.number = number;
}
}

public class Mian01 {

public static void main(String[] args) {
// 直接引用
Day day01 = Day.MON;
Day day02 = Day.THU;
Day day03 = Day.SUN;

System.out.println("-----------------toString()-------------------");
// 1、toString
System.out.println(day01.toString());
System.out.println(day02.toString());
System.out.println(day03.toString());

System.out.println("-----------------ordinal()-------------------");
// 2、ordinal()
System.out.println(day01.ordinal());
System.out.println(day02.ordinal());
System.out.println(day03.ordinal());

System.out.println("------------------name()--------------------");
// 3、name()
System.out.println(day01.name());
System.out.println(day02.name());
System.out.println(day03.name());

System.out.println("-----------------compareTo()------------------");
// 4、compareTo()
System.out.println(day01.compareTo(day01));
System.out.println(day01.compareTo(day02));
System.out.println(day03.compareTo(day01));
}
}

打印结果：

小小的拓展

本篇blog是非常初级的，仅仅可用于枚举的了解。如果想深入的了解枚举，可参考blog：

http://blog.csdn.net/javazejian/article/details/71333103

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