Predefined methods of enumeration types:
public static enumtype[] values() //枚举类型的数组，该数组包含枚举的所有枚举成员，并按他们的生命顺序存储 public static enumtype valueOf(String str) //返回名称为str的枚举成员
java example:
package java示例; enum Direction { EAST,NORTH,SOUTH,WEST } public class 不包含方法的枚举 { public static void main(String[] args) { Direction dir=Direction.EAST; Direction dir1=Direction.valueOf("NORTH"); System.out.print(dir); System.out.println(" "+dir1); for(Direction d:Direction.values()) //d.ordinal()返回枚举成员在枚举中的序号 //d.name()返回枚举常量的名称 System.out.println("序号："+d.ordinal()+"的值为："+d.name()); } } 运行结果： EAST NORTH 序号：0的值为：EAST 序号：1的值为：NORTH 序号：2的值为：SOUTH 序号：3的值为：WEST
Since all enumeration classes inherit java .lang,Enum, this class defines public methods of enumeration for users to use. Since the Enum class implements two interfaces, java.lang.Comoarable and java.lang.Serializable, enumeration types can use comparators and traversal operations.
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The following are common methods of the Enum class:
public final int comparaTo(E o) //返回当前枚举成员与参数枚举成员o在定义时顺序的比较结果 public final String name() //返回枚举常量的名称 public final int ordinal() //返回枚举成员在枚举中的序号 public final boolean equals(Object obj) //比较两个枚举引用的对象是否相等 public String toString() //返回枚举成员的名称 public static《T extends Enum《T》》T valueOf(Class《T》enumType,String name) //返回指定枚举类型和指定名称的枚举成员
java example:
package java示例; enum Direction{ EAST("东"),SOUTH("南"),WEST("西"),NORTH("北"); private String name; private Direction(String name) { this.name=name; } public String toString() { return name; } } public class 示例 { public static void main(String[] args) { //public static>T valueOf(ClassenumType,String name) //返回指定枚举类型和指定名称的枚举成员 Direction dir=Enum.valueOf(Direction.class, "NORTH"); System.out.println(dir); for(Direction d:Direction.values()) //d.name()返回枚举常量的名称 //d.toString()返回枚举成员的名称 System.out.println(d.name()+"的属性是"+d.toString()); } } 运行结果： 北 EAST的属性是东 SOUTH的属性是南 WEST的属性是西 NORTH的属性是北
package Example; enum Direction1 { EAST,SOUTH,WEST,NORTH } enum Direction2 { EAST,SOUTH,WEST,NORTH } public class Example5 { public static void main(String[] args) { Direction1 dir1=Direction1.WEST; Direction2 dir2=Direction2.NORTH; Direction1 dir3=Direction1.NORTH; System.out.println(dir1.compareTo(dir3)); System.out.println(dir1.equals(dir2)); } } 运行结果： -1 false ``
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