public enum Operation extends Enum<Operation>
OperatorOverloader can implement for any pair of
operands.public static final Operation ADD
public static final Operation SUBTRACT
public static final Operation DIVIDE
public static final Operation MULTIPLY
public static final Operation MODULUS
public static final Operation POWER
public static Operation[] values()
for (Operation c : Operation.values()) System.out.println(c);
public static Operation valueOf(String name)
name - 要返回的枚举常量的名称。IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量NullPointerException - 如果参数为空值