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why a class cannot extend more than one class in java

by Bette Eichmann Sr. Published 3 years ago Updated 3 years ago

here the problem comes – Because D is extending both B & C so if D wants to use the same method which method would be called (the overridden method of B or the overridden method of C). Ambiguity. That's the main reason why Java doesn't support multiple inheritance
multiple inheritance
The "diamond problem" (sometimes referred to as the "Deadly Diamond of Death") is an ambiguity that arises when two classes B and C inherit from A, and class D inherits from both B and C.
https://en.wikipedia.org › wiki › Multiple_inheritance
.

Full Answer

Why can't a class extend two classes in Java?

That's because Java does not support multiple inheritance in order to avoid circular dependencies or ambiguity. If class C extends Both A and B class, then the super class while calling invoke would become ambiguous. Click to see full answer. Also know, can you extend two classes in Java?

Why can't we use multiple extends in Java?

Multiple inheritance is not implemented in Java so as to avoid a problem called Dreaded Diamond (and other causes) caused by multiple and hierarchical inheritance (together used) like in other languages like C++. So in short you cannot use multiple extends. – meain May 6 '14 at 14:36

Can a class extend an interface?

An interface is just a list of methods specifying their name, parameters and return type. It is possible for one interface to extend another interface but an interface cannot extend a class nor can a class extend an interface. The reason for this is that an interface does not specify the code (meaning implementation) for the methods it specifies.

Why can't we inherit multiple classes in Java?

Because, unlike C++, multiple inheritance isn't allowed in Java. You can inherit from (implement) multiple interfaces, but (extend) only one class. That's just the restriction of the language. , The aid of computers!

Why a class Cannot extend multiple classes?

"One class extending two classes" is against the specification of the language. If you do not want to consider interfaces, it cannot be done.Sep 20, 2012

Why a class Cannot extend multiple classes in Java?

Multiple Inheritance is a feature of an object-oriented concept, where a class can inherit properties of more than one parent class. The problem occurs when there exist methods with the same signature in both the superclasses and subclass.Dec 17, 2021

Can a class extend more than one classes?

A class can extend only one class, but implement many interfaces. An interface can extend another interface, in a similar way as a class can extend another class.

Why can you only extend 1 class?

In Java, multiple inheritances are not allowed due to ambiguity. Therefore, a class can extend only one class to avoid ambiguity.May 22, 2020

Which class Cannot extend?

The main purpose of using a class being declared as final is to prevent the class from being subclassed. If a class is marked as final then no class can inherit any feature from the final class. You cannot extend a final class. If you try it gives you a compile time error.Dec 29, 2017

Can Java extend more than one class Why discuss your thoughts?

Multiple inheritance is not supported in java, to get around this the concept of Interfaces is used. You can inherit from as many interfaces you like to achieve multiple inheritance.Apr 4, 2014

Can a Java class extend more than one?

3.1. A class can inherit another class and define additional members. We can now say that the ArmoredCar class is a subclass of Car, and the latter is a superclass of ArmoredCar. Classes in Java support single inheritance; the ArmoredCar class can't extend multiple classes.Jul 15, 2020

Can you extend an extended class Java?

It is not possible to extend multiple classes in Java because there is no support for multiple inheritances in Java. And therefore we cannot write multiple class names after the extended keyword. But, multiple classes can inherit from a single class as java supports hierarchical inheritance.

Can a subclass extend two superclasses in Java?

Java Only Supports Singular Inheritance The Java inheritance mechanism only allows a Java class to inherit from a single superclass (singular inheritance). In some programming languages, like C++, it is possible for a subclass to inherit from multiple superclasses (multiple inheritance).Sep 4, 2015

Can class both extend and implement?

A class can extend only one class; but can implement any number of interfaces. A subclass that extends a superclass may override some of the methods from superclass.Jan 29, 2022

What is difference between extends and implements in Java?

Difference: implements means you are using the elements of a Java Interface in your class. extends means that you are creating a subclass of the base class you are extending. You can only extend one class in your child class, but you can implement as many interfaces as you would like.

Why does Java not support multiple inheritance?

That’s because Java does not support multiple inheritance in order to avoid circular dependencies or ambiguity. If class C extends Both A and B class, then the super class while calling invoke would become ambiguous. The better approach would be to use Interfaces, as Java allows you to implement Multiple interfaces.

What is public class in Java?

The public class acts as the initial class from where the JVM instance for the Java application (program) is begun. So when we provide more than one public class in a program the compiler itself stops you by throwing an error.

What is inheritance class?

Inheritance means giving contents of one type of object to another object. Consider this example:

How many classes should a source file contain?

Each source file should contain only one public class and the name of that public class should be similar to the name of the source file. If you are declaring a main method in your source file then main should lie in that public class. If you are not follow. Continue Reading.

Can you extend more than one class in Java?

Continue Reading. Yes, We can’t extend more than one class in Java. This is so, as Java does not support multiple inheritance because of ambiguity. Scenario of Ambiguity: Consider the above diagram which shows multiple inheritance as Class D extends both Class B & C.

Can multiple inheritance be implemented in Java?

The concept of Multiple Inheritance, as shown below, cannot be implemented in Java. However, there is a work-around to this which involves the use of Interfaces. You can declare abstract methods in Interfaces and then define them in your derived class, so to speak.

Should every class have its own source file?

According to Java standards and common practices, we should declare every class in its own source file. And even if we declare multiple classes in a single source file (.java), still each class will have its own class file after compilation.

Solution 1

Say there are two methods in class A and class B. Both has same method named 'myMethod'. Now if you inherit class A and class B to class C and then you call myMethod, whic one has to get called? class A's one or class B's one.

Solution 3

I'm a little irritated Teena. As I wrote in my reply to your comment on JSOP's answer in your question here [ ^] I told you what exactly to google for: java multiple inheritance. The first four hits in google carry more than enough information to explain why this was done.

What happens when you extend a class?

Extending more than one class will lead to code execution failure. When a class extends a class, then it is called single inheritance. If a class extends more than one class, it is called multi-inheritance, which is not allowed in Java. Let’s see some examples and understand the complete concept.

What is inheritance in Java?

Inheritance is a Java OOPs feature that allows extending a class to another class to access properties of a class. Java allows extending class to any class, but it has a limit. It means a class can extend only a single class at a time. Extending more than one class will lead to code execution failure.

Can you extend two interfaces in Java?

Extend Two Interfaces in Java. Two classes are not allowed, but a class can extend two interfaces in Java. This language allows extending two or more interfaces in a class. This code executes smoothly without any error. So, if you want to extend multiple inheritances, it would be better to use the interface. See the example below.

Can Java extend to another class?

Extend a Class in Java. Java does not allow multiple inheritances. In this example, we created two classes. A class extends to another and executes fine; this means that Java allows the extension of a single class.

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