枚举
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//枚举类 : People.woman 等价于new People().womanpublic enum People { //woman, man;等价于如下 //public static final People2 woman=new People2(); //public static final People2 man=new People2(); woman, man;}
public enum People2 { //woman("女"), man("男");等价于如下 //public static final People2 woman=new People2("女"); //public static final People2 man=new People2("男"); woman("女"), man("男"); private String name; private People2(String name) { this.name = name; } public String getName() { return name; }}
public enum People3 { /* * woman("女") { @Override public void show() { System.out.println("女"); } }, 等价于 public static final People3 woman = new People3("女") { @Override public void show() { System.out.println("女"); } }; */ woman("女") { @Override public void show() { System.out.println("女"); } }, man("男") { @Override public void show() { System.out.println("男"); } }; private String name; private People3(String name) { this.name = name; } public String getName() { return name; } public abstract void show();}
测试:
public class Test { public static void main(String[] args) { System.out.println("------People-------"); People p = People.woman; System.out.println(p); // woman // public String toString()返回枚举常量的名称,它包含在声明中。 System.out.println("------People2-------"); People2 p2 = People2.woman; System.out.println(p2); System.out.println(p2.getName()); System.out.println("------People3-------"); People3 p3 = People3.woman; System.out.println(p3); System.out.println(p3.getName()); p3.show(); System.out.println("-----People3-switch--------"); People3 p32 = People3.woman; System.out.println(p32); switch (p32) { case woman: System.out.println("woman"); break; case man: System.out.println("man"); break; } People2 p21 = People2.woman; People2 p22 = People2.man; System.out.println("------ordinal 返回枚举常量的序数(它在枚举声明中的位置,其中初始常量序数为零--------"); // int ordinal() System.out.println(p21.ordinal()); System.out.println(p22.ordinal()); System.out.println("------compareTo(E o)比较此枚举与指定对象的顺序。---"); System.out.println(p21.compareTo(p22)); System.out.println("-------name 返回此枚举常量的名称--------"); // String name() System.out.println(p21.name()); System.out.println(p22.name()); System.out.println("--------toString------"); // String toString() System.out.println(p21.toString()); System.out.println(p22.toString()); System.out.println("-------valueOf回带指定名称的指定枚举类型的枚举常量-------"); // <T> T valueOf(Class<T> type,String name) People2 p223 = Enum.valueOf(People2.class, "woman"); System.out.println(p223.getName()); System.out.println("------values()----------"); // values() //遍历枚举类的所有枚举值 People2[] pirs = People2.values(); for (People2 p224 : pirs) { System.out.println(p224+"--------"+p224.getName()); } }}输出:------People-------woman------People2-------woman女------People3-------woman女女-----People3-switch--------womanwoman------ordinal 返回枚举常量的序数(它在枚举声明中的位置,其中初始常量序数为零--------01------compareTo(E o)比较此枚举与指定对象的顺序。----1-------name 返回此枚举常量的名称--------womanman--------toString------womanman-------valueOf回带指定名称的指定枚举类型的枚举常量-------女------values()----------woman--------女man--------男
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