Understanding Interfaces in Java || Lesson 62 || Java Programming || Learning Programming ||
Understanding Interfaces in Java
In this class, We discuss Understanding Interfaces in Java.
The reader should have prior knowledge of abstract classes and methods. Click Here.
Interface:
An interface is a fully abstract class.
The interface contains abstract methods and static constants.
Example:
interface A
{
int p=20;
void m1();
}
Class B implements A
{
public void m1()
{
System.out.println(“m1 method implemented in B”);
}
}
class test
{
public static void main(String args[])
{
B ob = new B();
ob.m1();
}
}
The Java compiler will convert void m1(); to public abstract void m1(); because A is an interface.
Similarly, int p = 20 is converted to public static final int p = 20;
The compiler adds the extra code.
To inherit the interface, we use the keyword “implements”.
Suppose a class implements an interface. Then all the methods should be implemented.
Interfaces can have static methods.
Example:
interface A
{
int p=20;
public static void staticmethod()
{
System.out.println(“static method”);
}
void m1();
}
Class B implements A
{
public void m1()
{
A.staticmethod();
System.out.println(“m1 method implemented in B”);
}
}
class test
{
public static void main(String args[])
{
B ob = new B();
ob.m1();
}
}
Inheritance for interfaces
interface A
{
int p=20;
void m1();
}
interface B extends A
{
void m2();
}
Class C implements B
{
public void m1()
{
System.out.println(“m1 method implemented in B”);
}
public void m2()
{
System.out.println(“m2 method”);
}
}
class test
{
public static void main(String args[])
{
C ob = new C();
ob.m1();
}
}
Yes, inheritance is applied for interfaces.
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