Difference of Enum between java and C++?

Question

I am learning Enums in java I like to know what are the major differences of Enum in java and C++. Thanks

Answer 1

In c++ an enum is just a list of integer values. In java an enum is a class which extends Enum and is more a nice way to write:

class MyEnum extends Enum<MyEnum>
{
public final static MyEnum VE01 = new MyEnum();
public final static MyEnum VE02 = new MyEnum();
}

as enum:

enum MyEnum
{
 VE01,VE02;
}

For the Methods of enum see this. Since a java enum is an object it supports everything a normal java object does. as giving them values or functions:

enum Binary{
 ZERO(0),ONE(1);
 Binary(int i)
 {
   value = i;
 }
 public final int value;
}

a nice one is anonymous classes:

enum State{
StateA{
   public State doSomething()
   {
     //state code here
     return StateB;
    }
},
StateB{
    public State doSomething()
    {
       return StateA;
    }
};
public abstract State doSomething();
}

Answer 2

In C++, an enumeration is just a set of named, integral constants. In Java, an enumeration is more like a named instance of a class. You have the ability to customize the members available on the enumeration.

Also, C++ will implicitly convert enum values to their integral equivalent, whereas the conversion must be explicit in Java.

More information available on Wikipedia.