abstract code in java

/**
 * @author lautturi.com
 * Java example: abstract class
 */

import java.util.*;

abstract class Adapter {
	public abstract void powerSupply();

	public void turnOn() {
		System.out.println("turnOn the Power");
	}
}

class AC12VAdapter extends Adapter {
	public void powerSupply(){
		System.out.println("12V power");
	}
}

public class Lautturi {

	public static void main(String[] args) {

		AC12VAdapter obj = new AC12VAdapter();

		// access method of abstract class
		obj.turnOn();
		obj.powerSupply();

	}

}

Output:

turnOn the Power
12V power