Difference interface vs abstract class in java
In this tutorial, we will learn about:
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difference between abstract class and interface in java
Methods
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An abstract class can have both abstract methods and concrete methods.
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An interface has all the methods as abstract. Methods in interface is 100% abstract.
Keyword used to declare
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To declare abstract class use the keyword ‘abstract’.
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To declare interface use the word ‘interface’.
Method declaration
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In abstract class, to declare any method as abstract use of abstract keyword is mandatory.
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In interface, to declare methods as abstract use of abstract keyword is optional. Methods in interface is by default abstract.
Inheritance Supported
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Being a class, an abstract class cannot inherit multiple classes. It can only inherit one class.
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An Interface can extend (or inherit) multiple interfaces.
What can be extended?
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An abstract class can extend either normal class or abstract class.
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Interface can extend only interface but not a class.
Variable type & Access modifier
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An abstract class can have static, non-static, final or non-final variable with any access modifier.
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An interface can only have public static final variable. In interface variable is constant.
Example of abstract class
Given below is a simple example of abstract class:
abstract class TutorialsInHand{
//abstract method- body of the method not defined
public abstract void javaTutorial();
//concrete method or non-abstract method
public void motive(){
System.out.print("Provide best learning resources");
}
}
Read in detail about abstract method here
Example of Interface
Given below is a simple example of interface in java
interface SampleExample{
public static final int constVar = 9;
//abstract method
public void method1();
}
Read in detail about interface in java
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About the Author
Sonu Pandit
Technology geek, loves to write and share knowledge with the world. Having 10+ years of IT experience. B.Tech in Computer Science & Engineering
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Published Date :
Aug 30,2020
