How to create a abstract class?

Basic of a abstract class.

								
package AbstractClass;

/**
 *
 * @author MindClues
 */
public class Design {

    public static void main(String[] args) {
        Circle obj = new Circle();
        obj.area();
        obj.detail();
    }

}

class Circle extends Trangle {

    public void area() {
        System.out.println("Area method implementation");
        //To change body of generated methods, choose Tools | Templates.
    }

    public void detail() {
        System.out.println("Detail method implementation");
    }

}

abstract class Trangle {

    public abstract void area();

    abstract void detail();

}

							

								
Area method implementation
Detail method implementation