Extending Generic Classes in java

Extending Generic Classes in java

In Java, you can extend generic classes just like you would with non-generic classes. However, when extending a generic class, you may need to provide type arguments for the generic parameters if the parent class requires them. Here's how you can extend a generic class in Java:

Let's assume you have a generic class called Box<T>:

public class Box<T> { private T value; public Box(T value) { this.value = value; } public T getValue() { return value; } }

Now, you want to create a subclass that extends this generic class with a specific type. Here's an example:

public class StringBox extends Box<String> { public StringBox(String value) { super(value); } // You can add additional methods or override methods here }

In this example, StringBox extends the generic class Box<String>, specifying String as the type argument for the T parameter. The constructor of StringBox calls the superclass constructor using super(value) to initialize the value.

You can create instances of the StringBox class and use them as follows:

public class Main { public static void main(String[] args) { StringBox stringBox = new StringBox("Hello, world!"); String value = stringBox.getValue(); System.out.println(value); // Output: Hello, world! } }

You can extend generic classes in the same way with any specific type argument or even create new generic subclasses by providing a different type argument. Just make sure to specify the correct type argument when extending the generic class.

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