How to Call Parent Methods In Java/Groovy?

In Java or Groovy, you can call a parent method within a subclass using the keyword super. This keyword allows you to access the superclass's method or variable.

To call a parent method in Java, you simply use the super keyword followed by the method name and any necessary arguments. For example, super.methodName(args).

In Groovy, you can also use the super keyword to call a parent method. However, Groovy allows you to omit the super keyword and directly call the parent method without it. This is because Groovy automatically delegates calls to the superclass if the method is not found in the subclass.

Overall, calling parent methods in Java or Groovy allows you to reuse code and avoid redundancy in your program.

What is the super.method() in Java?

In Java, the super.method() statement is used to call a method from the superclass of a subclass. It is often used when there is a method in the subclass with the same name as a method in the superclass and you want to specifically call the method in the superclass. This allows for method overriding in Java.

What is the purpose of calling a parent method in Java/Groovy?

Calling a parent method in Java/Groovy allows a subclass to inherit and extend the functionality of the parent class. By calling a parent method, a subclass can reuse the code already implemented in the parent class, while also adding additional functionality or behavior specific to the subclass. This helps to reduce code duplication and promotes code reusability, making the codebase more maintainable and easier to extend in the future.

How to extend a class in Java?

To extend a class in Java, you use the extends keyword followed by the name of the class you want to extend. Here is an example:

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public class Animal {
    public void eat() {
        System.out.println("Eating...");
    }
}

public class Cat extends Animal {
    public void meow() {
        System.out.println("Meow!");
    }
}

In this example, the Cat class extends the Animal class. This means that the Cat class inherits all the methods and properties of the Animal class, and can also have its own methods and properties.

How to access parent method in child class in Java?

To access a parent method in a child class in Java, you can use the super keyword. Here's an example:

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public class Parent {
    public void display() {
        System.out.println("Parent method");
    }
}

public class Child extends Parent {
    public void display() {
        super.display(); // calling the display method of the parent class
        System.out.println("Child method");
    }
    
    public static void main(String[] args) {
        Child child = new Child();
        child.display();
    }
}

In this example, we have a Parent class with a display() method and a Child class that extends the Parent class. In the display() method of the Child class, we call the super.display() method to access and call the display() method of the parent class before executing the child class' code.

How to access parent class methods in Java?

In Java, you can access parent class methods by using the super keyword.

For example, if you have a child class that extends a parent class, you can call the parent class method using super.methodName().

Here's an example:

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class ParentClass {
  public void parentMethod() {
    System.out.println("Parent method called");
  }
}

class ChildClass extends ParentClass {
  public void childMethod() {
    super.parentMethod();
    System.out.println("Child method called");
  }
}

public class Main {
  public static void main(String[] args) {
    ChildClass child = new ChildClass();
    child.childMethod();
  }
}

In this example, the parentMethod() from the ParentClass is called in the childMethod() of the ChildClass using super.parentMethod().