Abstract classes in Java

Java abstract classes

//1 parent class is abstract
package org.abstr.classes;

public abstract class AbstracClass {
	public static void main(String [] args )
	{
		
	}
	
	
	public int areaFinder(int length, int breadth)
	{
		return length * breadth;
	}
	
	abstract void volumeFinder();
	
	abstract int volumeOfRoom();

}

//2 Child class to abstract class
package org.abstr.classes;

public class ChildAbstract extends AbstracClass{
	int length=10;
	int breadth=10;
	int height=9;

void volumeFinder() {
		// TODO Auto-generated method stub
		System.out.println("WHTS THE VOLUME????????");
		
	}

int volumeOfRoom() {
		// TODO Auto-generated method stub
		return length*breadth*height;
	}

}

//3 how to view their functionality? here:

package org.abstr.classes;

public class AbstractDemo {
	public static void main( String [] ars)
	{
	
		AbstracClass c1 = new ChildAbstract();
		AbstracClass class1 = c1;
		System.out.println("Area of rectangle: "+class1.areaFinder(12, 12));
		class1.volumeFinder();
		System.out.println(class1.volumeOfRoom());
		
	}
}

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