Java Difference between abstract class and interface
Abstract class and interface both are used to achieve abstraction where we can declare the abstract methods. Abstract class and interface both can't be instantiated.
But there are many differences between abstract class and interface.
Abstract class Vs Interface
1) Abstract class can have abstract and non-abstract methods. Interface can have only abstract methods.
2) Abstract class doesn't support multiple inheritance. Interface supports multiple inheritance.
3) Abstract class can have final, non-final, static and non-static variables. Interface has only static and final variables.
4) Abstract class can have static methods, main method and constructor. Interface can't have static methods, main method or constructor.
5) Abstract class can provide the implementation of interface. Interface can't provide the
implementation of abstract class.
6) The abstract keyword is used to declare abstract class. The Interface keyword is used to declare Interface.
7) Example:
public abstract class Shape{
public abstract void draw();
} Example:
public interface Drawable{
void draw();
}
Simply, abstract class achieves partial abstraction (0 to 100%) whereas Interface achieves fully abstraction (100%).
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