Java enum常见的用法
Java enum常见的用法
浮生夢 2019-08-05 16:23:29 60459 收藏 33
分类专栏： tool
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一,常量定义
public enum WeekDay {
SUN, MON, TUE, WED, THT, FRI, SAT
}
二,swich
public enum WeekDay {
SUN, MON, TUE, WED, THT, FRI, SAT
}
public class SelectDay{
WeekDay weekday = WeekDay.SUN;
public void select(){
switch(weekday){
case SUN:
weekday = WeekDay.SUN;
bread;
...
}
}
}
三,向枚举添加新方法
public enum Color {
RED("红色", 1), GREEN("绿色", 2), BLANK("白色", 3), YELLO("黄色", 4);
// 成员变量
private String name;
private int index;
// 构造方法
private Color(String name, int index) {
this.name = name;
this.index = index;
}
// 普通方法
public static String getName(int index) {
for (Color c : Color.values()) {
if (c.getIndex() == index) {
return c.name;
}
}
return null;
}
// get set 方法
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getIndex() {
return index;
}
public void setIndex(int index) {
this.index = index;
}
}
四,覆盖枚举方法
public enum Color {
RED("红色", 1), GREEN("绿色", 2), BLANK("白色", 3), YELLO("黄色", 4);
// 成员变量
private String name; private int index;
// 构造方法
private Color(String name, int index) {
this.name = name; this.index = index;
}
//覆盖方法
@Override
public String toString() {
return this.index+"_"+this.name;
}
}
五,实现接口
public interface Behaviour {
void print();
String getInfo();
}
public enum Color implements Behaviour{
RED("红色", 1), GREEN("绿色", 2), BLANK("白色", 3), YELLO("黄色", 4);
// 成员变量
private String name;
private int index;
// 构造方法
private Color(String name, int index) {
this.name = name; this.index = index;
}
//接口方法
@Override
public String getInfo() {
return this.name;
}
//接口方法
@Override
public void print() {
System.out.println(this.index+":"+this.name);
}
}
六,接口组织枚举
public interface Food {
enum Coffee implements Food{
BLACK_COFFEE,DECAF_COFFEE,LATTE,CAPPUCCINO
}
enum Dessert implements Food{
FRUIT, CAKE, GELATO
}
}
七,枚举集合
public class Test {
public static void main(String[] args) {
EnumSet
week.add(WeekDay.MON);
System.out.println("EnumSet中的元素：" + week);
week.remove(WeekDay.MON);
System.out.println("EnumSet中的元素：" + week);
week.addAll(EnumSet.complementOf(week));
System.out.println("EnumSet中的元素：" + week);
week.removeAll(EnumSet.range(WeekDay.FRI, WeekDay.SAT));
System.out.println("EnumSet中的元素：" + week);
}
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版权声明：本文为CSDN博主「浮生夢」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/echizao1839/article/details/80890490