Member of entity template

Similar to Java, in MCFPP, members of entity template include attributes and methods. Attributes are the data members, used to store the data of the object; methods are the function of entity template member, used to operate the data of the object. Member of entity template can access by . operator.

Attributes

Attributes are the data member of entity template, used to store the data of a object. The grammar to define attributes is shown below:

class A{
    int a;
    int b = 5;
}

The code before defined a entity template A, it has two attributes a and b. a is a integer attribute, not initialized; b is a integer attribute, initialized as 5.

Method

Methods are the function member of entity template, used to operate the data of the object. The grammar to define a method is shown below:

class A{
    void test(){
        print("Hello, World!");
    }
}

Use keyword this can access the attributes of the object,such as:

class A{
    int a;
    void setA(int a){
        this.a = a;
    }
}

Access control

In MCFPP, members of entity template can use keywords public, protected and private to control the access rights. Default, members of entity template are private.

• public：public, accessible to outside.
• protected：protected, accessible to subclasses.
• private：private, only can access in the entity template.

class A{
    public int a;
    protected int b;
    private int c;
}

class B: A{
    void test(){
        a = 1;  # Allowed 
        b = 2;  # Allowed 
        c = 3;  # Error 
    }
}

func test(){
    A obj = new A();
    obj.a = 1;  # Allowed 
    obj.b = 2;  # Error 
    obj.c = 3;  # Error 
}