枚举
package com.loaderman.枚举; public class Demo1_Enum { /** * @param args */ public static void main(String[] args) { //demo1(); //demo2(); //demo3(); Week3 mon = Week3.TUE; switch (mon) { case MON: System.out.println("星期一"); break; case TUE: System.out.println("星期二"); break; } } public static void demo3() { Week3 mon = Week3.MON; mon.show(); } public static void demo2() { Week2 mon = Week2.MON; System.out.println(mon.getName()); } public static void demo1() { Week mon = Week.MON; System.out.println(mon); } }
package com.loaderman
.枚举; public class Demo2_Enum { /** * int ordinal() * int compareTo(E o) * String name() * String toString() * <T> T valueOf(Class<T> type,String name) * values() * 此方法虽然在JDK文档中查找不到,但每个枚举类都具有该方法,它遍历枚举类的所有枚举值非常方便 */ public static void main(String[] args) { //demo1(); // Week2 mon = Week2.valueOf(Week2.class, "MON"); //通过字节码对象获取枚举项 // System.out.println(mon); Week2[] arr = Week2.values(); for (Week2 week2 : arr) { System.out.println(week2); } } public static void demo1() { Week2 mon = Week2.MON; Week2 tue = Week2.TUE; Week2 wed = Week2.WED; /*System.out.println(mon.ordinal()); //枚举项都是有编号的 System.out.println(tue.ordinal()); System.out.println(wed.ordinal()); System.out.println(mon.compareTo(tue)); //比较的是编号 System.out.println(mon.compareTo(wed));*/ System.out.println(mon.name()); //获取实例名称 System.out.println(mon.toString()); //调用重写之后的toString方法 } } package com.loaderman
.枚举; public enum Week2 { MON("星期一"),TUE("星期二"),WED("星期三"); private String name; private Week2(String name) { this.name = name; } public String getName() { return name; } public String toString() { return name; } }
package com.loaderman
.枚举;
public enum Week {
MON,TUE,WED;
}
package com.loaderman
.枚举;
public enum Week3 {
MON("星期一"){
public void show() {
System.out.println("星期一");
}
},TUE("星期二"){
public void show() {
System.out.println("星期二");
}
},WED("星期三"){
public void show() {
System.out.println("星期三");
}
};
private String name;
private Week3(String name) {
this.name = name;
}
public String getName() {
return name;
}
public abstract void show();
}
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