Menu

Creating Constructor in Abstract Class

Creating Constructor in Abstract Class

Yes, constructors can be created in abstract classes in Java. Abstract classes can have constructors just like any other class. These constructors are typically used to initialize the state of the abstract class and may also initialize fields that are common to all subclasses.

Creating Constructor in Abstract Class

Example of Abstract Class with Constructor
```java
public abstract class AbstractClass {
    private int value;

    // Constructor
    public AbstractClass(int value) {
        this.value = value;
    }

    // Abstract method
    public abstract void abstractMethod();

    // Concrete method
    public void displayValue() {
        System.out.println("Value: " + value);
    }
}

public class ConcreteClass extends AbstractClass {
    // Constructor chaining
    public ConcreteClass(int value) {
        super(value);
    }

    // Implementation of abstract method
    @Override
    public void abstractMethod() {
        System.out.println("Implementation of abstractMethod");
    }
}
```

Summary

In the example above, the `AbstractClass` has a constructor that initializes the `value` field. Subclasses, such as `ConcreteClass`, can extend this abstract class and use the constructor of the abstract class by using `super(value)` to invoke it. This allows for common initialization logic to be shared among subclasses.

Homepage

Readmore