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how to add member variable and methods to in built class without subclassing it


how to add member variable and methods to in built class without subclassing it

By : mhdav
Date : October 16 2020, 11:12 PM
help you fix your problem For methods: you can use categories to add member methods without subclassing. It is a pretty common practice in Cocoa, to add per-framework extensions methods.
For instance variables: starting with Snow Leopard (Mac OS X 10.6), you can use associative references. You use them to simulate the addition of object instance variables to an existing class.
code :


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Class methods implementation: should it change a class' member variable or take in arguments?

Class methods implementation: should it change a class' member variable or take in arguments?


By : SlyKrysis
Date : March 29 2020, 07:55 AM
I wish did fix the issue. By using internal methods that take parameters rather than treating a class member variable as global for that class you not only make it easier to unit test those functions, but you also reduce the possibility of introducing bugs due to that member variable being altered out of sequence, especially if the class has any event or worker thread driven behaviour.
So I would go for the second example rather than the first.
code :
DoSomeWorkOn(pointerto int);
int newValue = DoSomeWorkOn(int oldValue);
Subclassing and built-in methods in Python

Subclassing and built-in methods in Python


By : user3390428
Date : March 29 2020, 07:55 AM
should help you out I know this doesn't answer your question, but you could put the socket into an instance variable. This is what Nobody also suggested in the comments.
code :
class ICMPSocket():
    def __init__(self):
        self.s = socket.socket(
            socket.AF_INET,
            socket.SOCK_RAW,
            socket.getprotobyname("icmp"))
    def sendto(self, data, host):
        self.s.sendto(data, (host, 1))
    def __getattr__(self, attr):
        return getattr(self.s, attr)
How is different methods of a class changing a member's data different from a global variable

How is different methods of a class changing a member's data different from a global variable


By : Олег Глитень
Date : March 29 2020, 07:55 AM
With these it helps You need access to the object to call those methods. That means you have a clear dependency on it. It would need to be passed to any class using it. Only code that you explicitly give access to this object can change the variable. That is different from a global variable.
code :
void foo(ChangeingMember member) { // <-- dependency
    member.test1();    
}

void bar() { // <-- no dependency
    SomeGlobal.someMethod();
}
ChangingMember obj = new ChangingMember();
foo(obj); // Giving 'foo' access to 'obj'
Why can't I modify class member variable outside any methods?

Why can't I modify class member variable outside any methods?


By : president
Date : March 29 2020, 07:55 AM
I hope this helps . It does not work because you are defining the instances outside of a constructor or methos which is not valid Java syntax.
A possible fix would be:
code :
class SomeVariables {
    String s;
    int dontneed;
}

class MainClass {
    public static void main(String[]args){
        SomeVariables vars = new SomeVariables();

        vars.s = "why this doesnt work?. IDE says Uknown class 'vars.s'";
        System.out.println(vars.s);
    }
}
class SomeVariables {
    private String s;
    private int dontneed;

    // Constructor method
    public SomeVariables() {
        // Initialize your attributes
    }

    public String getValue() {
        return s;
    }

    public void setValue(String value) {
        s = value;
    }
}

class MainClass {
    public static void main(String[]args){
        SomeVariables vars = new SomeVariables();

        vars.setValue("Some value");

        System.out.println(vars.getValue());
    }
}
Class member variable visibility in instance methods

Class member variable visibility in instance methods


By : Shiina Kaylie
Date : March 29 2020, 07:55 AM
like below fixes the issue , Try using Equilateral.angle instead of angle.
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