java abstract class member variables code example
Example 1: java abstract class
// abstract class
abstract class Shape
{
// abstract method
abstract void sides();
}
class Triangle extends Shape
{
void sides()
{
System.out.println("Triangle shape has three sides.");
}
}
class Pentagon extends Shape
{
void sides()
{
System.out.println("Pentagon shape has five sides.");
}
public static void main(String[] args)
{
Triangle obj1 = new Triangle();
obj1.sides();
Pentagon obj2 = new Pentagon();
obj2.sides();
}
}
Example 2: how to use an abstract class in java
interface methods{
public void hey();
public void bye();
}
//unable to implement all the abstract methods in the interface so
// the other class automatically becomes abstract
abstract class other implements methods{
public void hey(){
System.out.println("Hey");
}
}
//able to implement all the methods so is not abstract
class scratch implements methods {
public void hey(){
System.out.println("Hey");
}
public void bye() {
System.out.println("Hey");
}
}
Example 3: Can you add instance variables into abstract class
Yes, we can add instance or static variables into abstract classes