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Abstract method: can only be used in an abstract class, and it does not have a body. The body is provided by the subclass (inherited from). Example are.."/>
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<h3><strong>Java Abstract Class and Abstract Methods</strong></h3>
<p><strong>In this tutorial, we will learn about abstraction in Java. We will learn about Java abstract classes and methods and how to use them in our program.
</strong></p>
<ul>The abstract keyword is a non-access modifier, used for classes and methods:
<li><strong>Abstract class:</strong> is a restricted class that cannot be used to create objects (to access it, it must be inherited from another class).
</li>
<li><strong>Abstract method: </strong>can only be used in an abstract class, and it does not have a body. The body is provided by the subclass (inherited from).
</li>
</ul>
<h4><strong>Java Abstract Class</strong>
</h4>
<p>A class which is declared as abstract is known as an <strong>abstract class.</strong> It can have abstract and non-abstract methods. It needs to be extended and its method implemented. It cannot be instantiated.<br>
<strong>Example of Abstract class that has an abstract method</strong><br>
In this example, Bike is an abstract class that contains only one abstract method run. Its implementation is provided by the Honda class.
</p>
<code><pre>
abstract class Bike{
abstract void run();
}
class Honda4 extends Bike{
void run(){System.out.println("running safely");}
public static void main(String args[]){
Bike obj = new Honda4();
obj.run();
}
}
<strong>Output:</strong>
running safely
</pre></code>
<ul>
Points to Remember:
<li>1.An abstract class must be declared with an abstract keyword.</li>
<li>2.It can have abstract and non-abstract methods.</li>
<li>3.It cannot be instantiated.</li>
<li>4.It can have constructors and static methods also.</li>
<li>5.It can have final methods which will force the subclass not to change the body of the method.</li>
</ul>
<h4><strong>Java Abstract Method</strong>
</h4>
<p>A method without body (no implementation) is known as <strong>abstract method.</strong> A method must always be declared in an abstract class, or in other words you can say that if a class has an abstract method, it should be declared abstract as well.<br></p>
<code><pre>abstract class Animal {
public void displayInfo() {
System.out.println(“I am an animal.”);
}
abstract void makeSound();
}
</pre></code>
<p>In the above example, we have created an abstract class Animal. It contains an abstract method makeSound() and a non-abstract method displayInfo()</p>
<ul>Rules of Abstract Method:
<li>1. Abstract methods don’t have body, they just have method signature as shown above.</li>
2.<li> If a class has an abstract method it should be declared abstract, the vice versa is not true, which means an abstract class doesn’t need to have an abstract method compulsory.</li>
<li>3. If a regular class extends an abstract class, then the class must have to implement all the abstract methods of abstract parent class or it has to be declared abstract as well. </li>
</ul>
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