java - do I have to overwrite all versions of overloaded function in inheriting class?

java - do I have to overwrite all versions of overloaded function in inheriting class?

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Because I need a cancelable OutputStreamWriter, id did the following

public class CancelableStreamWriter extends OutputStreamWriter {

    public CancelableStreamWriter(OutputStream out, String charsetName) throws UnsupportedEncodingException {
        super(out, charsetName);
        //stuff
    }

    public CancelableStreamWriter(OutputStream out) {
        super(out);
        //stuff
    }

    public CancelableStreamWriter(OutputStream out, Charset cs) {
        super(out, cs);
        //stuff
    }

    public CancelableStreamWriter(OutputStream out, CharsetEncoder enc) {
        super(out, enc);
        //stuff
    }

    public void write(int c) throws IOException {
        if (myCancelCondition) {
            // cancel stuff
        }
        super.write(c);
    }

    public void write(char cbuf[], int off, int len) throws IOException {
        if (myCancelCondition) {
            // cancel stuff
        }
        super.write(cbuf, off, len);
    }

    public void write(String str, int off, int len) throws IOException {
        if (myCancelCondition) {
            // cancel stuff
        }
        super.write(str, off, len);
    }
}

I wonder, if I really have to overwrite all overloaded versions of the write function. Or is there something possible like:

    public void write(WHATEVERARGS) throws IOException {
        if (myCancelCondition) {
            // cancel stuff
        }
        super.write(WHATEVERARGS);
    }

Same with constrcutors.

Maybe this is not the most elegant approach at all, but I can't use a wrapper object for example, since the owning class is typed to OutputStreamWriter and I can't change that.


Keep your approach.

Unfortunately, it is not possible and there is no shortcut for overriding all methods (or "overriding" all constructors). Java methods and constructors must have fixed parameters. This is because of language design.

Fortunately, most IDEs support generating such code in a few clicks. You just have to select that you want to override all methods and constructors (and then add your custom functionality).

Everything About Method Overloading vs. Method Overriding, Unfortunately, it is not possible and there is no shortcut for overriding all methods (or "overriding" all constructors). Java methods and constructors must have fixed parameters. This is because of language design. Fortunately, most IDEs support generating such code in a few clicks. Overloading means two methods or more with the same name but with different parameters just like your example.While Overriding you implement a method from an interface or abstract class so the method in the super class has an implementation and in the subclass has a different one, Still they have the same method name and parameters.


It all depends on how internal logic is organized and what are public entry points.

For example, if youd super class would have some sort of set of overloaded methods, lets say A(X) A(X,Y) etc. and implementation of those methods would do some transformation only to call something like protected internalA(X,Y,Z...) than obviously overriding internalA will do the trick as all other paths will go trough that method. If all of them are doing different stuff, then you are out of luck and probably you have to override all possible entry points.

Another "hack" would be to use proxy that will intercept calls to an interface (if it is interface not class) and decide what to do with such call on runtime, but it might be overkill in your case. It seems that you suggest that you want to do exaclty the same thing - intercept call, process arguments, pass call trough. Thic can be done with proxy.

Since OutputStreamWriter internally does not delegate to single internal method, you should overload all of them, or accept the risk that "unpached" method will be used by someone.

Does overloading work with Inheritance?, As soon as we start learning Java, we get introduced to them and their Here, we will discuss method overloading and overriding in more detail, the the subclass inherits one version of the method from the parent class and then We need implement or, in other words, override all the abstract methods. Overriding is somewhat similar to overwriting in a sense of inheriting information from another source. When overriding a method in an inheriting class, the method must still remain the same as before (same as overloading), but this time the signature information MUST remain the same. This is the one of the main differences.


With looking into the sources or testing you might find out what does not need to be be overriden. Better seems to use a FilterWriter as base class, as that is its purpose.

Whether to combine your own Writer functionality with conversion from a binary OutputStream is the question: there are some overloaded constructors you would need to keep.

public class CancelableStreamWriter extends FilterWriter {

    public CancelableStreamWriter(OutputStream out, String charsetName)
            throws UnsupportedEncodingException {
        super(new OutputStreamWriter(out, charsetName));
        //stuff
    }

Can we Overload or Override static methods in java ?, If we have a function in base class and a function with same name in derived class, Java compiler determines correct version of the overloaded method to be  In Java it is possible to define two or more methods within the same class that share the same name, as long as their parameter declarations are different. When this is the case, the methods are said to be overloaded, and the process is referred to as method overloading.


What is difference between method overriding and method , A subclass (or derived class) provides a specific implementation of a method in Note that in both C++ and Java, methods cannot be overloaded according to return type. We can have two ore more static methods with same name, but differences in input Static method in base class which will be hidden in subclass. When inheriting, it is called overriding. A good example of this other scenario is when you want to alter the default behavior of a class by inheriting it, and particularly when you have something similar to the template method pattern, where you have each step of some algorithm implemented in a method.


Method Overloading and Overriding in Java, in this,it overwrite the base class method with derived class method. Method overload is when you have two methods of the same class with the same name All Answers (12) Generally, you should consider overloading a method when you have allowing the interpreter(java) choose the right method where it is used. Usually, method overloading happens inside a single class, but a method can also be treated as overloaded in the subclass of that class — because the subclass inherits one version of the method


11.8. Overriding vs Overloading, In our case, we have access to the source code for both classes, so we can clearly see that calling the accelerate() method on a base Vehicle  Function overloading in Javascript: Function overloading is the ability of a programming language to create multiple functions of the same name with different implementations. when an overloaded function is called it will run function a specific implementation of that function appropriate to the context of the call.