[JAVA] 인터페이스 구현

package hello;
class Pencil{
	public void write() {
		System.out.println("연필로 쓴다");
	}
}

class Ballpoint{
	public void writing() {
		System.out.println("볼펜으로 쓴다.");
	}
}
public class Mainclass {
	public static void main(String[] args) {
		Pencil pencil = new Pencil();
		Ballpoint ballpoint = new Ballpoint();
		pencil.write();
		ballpoint.writing();
	}
}

package hello;
interface Frindle {
	public void write();
}

class Pencil implements Frindle {
	public void write() {
		System.out.println("연필로 쓴다.");
	}
}

class Ballpoint implements Frindle {
	public void write() {
		System.out.println("볼펜으로 쓴다.");
	}
}

public class Mainclass{
	public static void main(String[] args) {
		Frindle frindle = new Pencil();
		frindle.write();
		Frindle frindle1 = new Ballpoint();
		frindle1.write();
	}
}

package hello;
interface PhoneInterface {
	final int TIMEOUT = 10000;
	void sendCall();
	void receiveCall();
	default void printLogo() {
		System.out.println("** phone **");
	}
}
class SamsungPhone implements PhoneInterface {

	@Override
	public void sendCall() {
		System.out.println("띠리리리링");
		
	}

	@Override
	public void receiveCall() {
		System.out.println("전화가 왔습니다.");
		
	}
	public void flash() {
		 System.out.println("전화기에 불이 켜졌습니다.");
	}
	
}

public class Mainclass {
	public static void main(String[] args) {
		SamsungPhone phone = new SamsungPhone();
		phone.printLogo();
		phone.sendCall();
		phone.receiveCall();
		phone.flash();
	}
}

package hello;
interface Mammal {
	abstract void giveBirth();
}
abstract class Fish {
	void swim() {
		System.out.println("물고기는 헤엄치며 움직입니다.");
	}
}

class Whale extends Fish implements Mammal{
	public void giveBirth() {
		System.out.println("고래는 새끼를 낳습니댜.");
	}
	public void swim() {
		System.out.println("고래는 헤엄치며 움직입니다.");
	}
}
public class Ifpr {
	public static void main(String[] args) {
		Whale w = new Whale();
		w.swim();
		w.giveBirth();
	}
}

package hello;
class OuterClass1 {
	void a() {
		System.out.println("method a");
	}
	void b() {}
}

public class Anonymous {
	public static void main(String[] args) {
		OuterClass1 o = new OuterClass1() {
			void a() {
				System.out.println("새롭게 정의한 익명 클래스의 메서드입니다.");
			}
		};
		o.a();
		OuterClass1 ok = new OuterClass1();
		ok.a();
	}
}

새롭게 정의한 익명 클래스의 메서드입니다.
method a