How does inheritance work in java

You can not create instance of abstract class. If it is not, where are overridden method hold? I tried to Google, but all I found is common information about how to inherit classes and so on. Update: You are still telling me obvious things. Maybe my question was little misleading, but I'll try to rephrase it: When we are calling method with super , you say, we are accessing parent's method.

Is super same as this? Improve this question. Roman C Overridden methods will have an entry in the symbolic method table of the overriding class.

Ditto for concrete implementations of abstract methods. When you class super. When you call the superclass method with super. Add a comment. Active Oldest Votes. Improve this answer. Perception Perception Let's go, line by line through your code. Your first statement, in your 'foo' method is super.

Abstract Classes You can't create instances of Abstract classes, no, but with the super keyword, you can access the functionality of the superclass nonetheless. In context of the Java Virtual Machine So what happens, when you make a method call, is the Java Virtual Machine will look for the method in the local class, if it is an instance method.

I tried to google, but all I found is common information about how to inherit classes and so on. Edited to a more specific response. If it is not, where are overrided method hold? I'm not quite sure what you mean by this, but: the method which prints "Super" is held in the class definition of the superclass the method which prints "Sub" is held in the class definition of the subclass.

Previous Prev. Next Continue. Home Testing Expand child menu Expand. SAP Expand child menu Expand. Web Expand child menu Expand. Must Learn Expand child menu Expand. Big Data Expand child menu Expand. Live Project Expand child menu Expand. AI Expand child menu Expand. Toggle Menu Close. Search for: Search. The super keyword is similar to this keyword. Following are the scenarios where the super keyword is used. It is used to differentiate the members of superclass from the members of subclass, if they have same names.

If a class is inheriting the properties of another class. And if the members of the superclass have the names same as the sub class, to differentiate these variables we use super keyword as shown below. We are invoking display method of both classes and printing the value of the variable num of both classes.

Here you can observe that we have used super keyword to differentiate the members of superclass from subclass. If a class is inheriting the properties of another class, the subclass automatically acquires the default constructor of the superclass.

But if you want to call a parameterized constructor of the superclass, you need to use the super keyword as shown below. The program given in this section demonstrates how to use the super keyword to invoke the parametrized constructor of the superclass. This program contains a superclass and a subclass, where the superclass contains a parameterized constructor which accepts a integer value, and we used the super keyword to invoke the parameterized constructor of the superclass.

However, name and eat are the members of the Animal class. Since Dog inherits the field and method from Animal , we are able to access the field and method using the object of the Dog. In Java, inheritance is an is-a relationship. That is, we use inheritance only if there exists an is-a relationship between two classes. For example,. Here, Car can inherit from Vehicle , Orange can inherit from Fruit , and so on. In Example 1 , we see the object of the subclass can access the method of the superclass.

However, if the same method is present in both the superclass and subclass, what will happen? In this case, the method in the subclass overrides the method in the superclass. This concept is known as method overriding in Java. In the above example, the eat method is present in both the superclass Animal and the subclass Dog.

Now when we call eat using the object labrador , the method inside Dog is called. This is because the method inside the derived class overrides the method inside the base class. This is called method overriding. To learn more, visit Java Method Overriding.

Note : We have used the Override annotation to tell the compiler that we are overriding a method. However, the annotation is not mandatory. To learn more, visit Java Annotations.