JAVA07강 객체지향 프로그래밍2자바200제 1~10

2021. 7. 26. 05:31

예제 7-1

public class CaptionTvTest {
	public static void main(String[] args) {
		CaptionTv ctv = new CaptionTv();
		ctv.power();
		ctv.channel = 10;
		ctv.channelUp();
		System.out.println(ctv.channel);
		ctv.display("Hello World");
		ctv.caption = true;
		ctv.display("Hello World2");
	}

}

class Tv {
	boolean power;
	int channel;
	
	void power() {power = !power;}
	void channelUp() {channel++;}
	void channelDown() {channel--;}
}
class CaptionTv extends Tv {
	boolean caption;
	void display(String text) {
		if(caption) {
			System.out.println(text);
		}
	}
}

11
Hello World2

예제7-2

public class DrawShape {
	public static void main(String[] args) {
		Point[] p = {	
				new Point(100, 100),
				new Point(140, 50),
				new Point(200, 100)
		};
		Triangle t = new Triangle(p);
		Circle c = new Circle(new Point(150, 150), 50);
		
		t.draw();
		c.draw();
	}

}

class Shape {
	String color = "black";
	void draw() {
		System.out.printf("[color=%s]%n", color);
	}
}

class Point {
	int x;
	int y;

	Point(int x, int y) {
		this.x = x;
		this.y = y;
	}

	Point() {
		this(0, 0);
	}

	String getXY() {
		return "(" + x + "," + y + ")"; // x와 y의 값을 문자열로 반환
	}
}

class Circle extends Shape {
	Point center;
	int r;

	Circle() {
		this(new Point(0, 0), 100);
}
	Circle(Point center, int r) {
		this.center = center;
		this.r = r;
	}
	
	void draw() {
		System.out.printf("[center=(%d, %d), r=%d, color=%s]%n", center.x, center.y, r, color);
	}
}

class Triangle extends Shape {
	Point[] p = new Point[3];
	
	Triangle(Point[] p) {
		this.p = p;
	}
	
	void draw() {
		System.out.printf("[p1=%s, p2=%s, p3=%s, color=%s]%n",
				p[0].getXY(),p[1].getXY(), p[2].getXY(), color);
	}
}

[p1=(100,100), p2=(140,50), p3=(200,100), color=black]
[center=(150, 150), r=50, color=black]

예제7-3

public class DeckTest {
	public static void main(String[] args) {
		Deck d = new Deck();
		Card c = d.pick();
		System.out.println(c);

		d.shuffle();
		c = d.pick(0);
		System.out.println(c);

	}
}

class Deck {
	final int CARD_NUM = 52;
	Card cardArr[] = new Card[CARD_NUM];

	Deck() {
		int i = 0;
		for (int k = Card.KIND_MAX; k > 0; k--) {	// 4
			for (int n = 0; n < Card.NUM_MAX; n++) {	//13
				cardArr[i++] = new Card(k, n + 1);
			}
		}
		
//		for(int i =0 ; i < CARD_NUM ; i++) {
//			cardArr[i++] = new Card(Card.KIND_MAX-i/Card.NUM_MAX, i%Card.NUM_MAX+1);
//		}
	}
		// cardArr[10] ?? 무늬, 숫자
		// diamond J 23
		// heart J 36
		//Clover J 49 50 51

	Card pick(int index) {
		return cardArr[index];
	}

	Card pick() {
		return pick((int) (Math.random() * CARD_NUM));
	}

	void shuffle() {
		for (int i = 0; i < cardArr.length; i++) {
			int r = (int) (Math.random() * CARD_NUM);

			Card temp = cardArr[i];
			cardArr[i] = cardArr[r];
			cardArr[r] = temp;

		}
	}
}

class Card {
	static final int KIND_MAX = 4;
	static final int NUM_MAX = 13;

	static final int SPADE = 4;
	static final int DIAMOND = 3;
	static final int HEART = 2;
	static final int CLOVER = 1;

	int kind;
	int number;

	Card() {
		this(SPADE, 1);
	}

	Card(int kind, int number) {
		this.kind = kind;
		this.number = number;
	}

	public String toString() {
		String[] kinds = { "", "CLOVER", "HEART", "DIAMOND", "SPADE" };
		String numbers = "0123456789XJQK"; // 숫자 10은 X로 표현
		return "kind : " + kinds[this.kind] + ", number : " + numbers.charAt(this.number);
	} // toString()의 끝
} // Card클래스의 끝

kind : SPADE, number : X
kind : DIAMOND, number : K

예제 7-4

class Tv {
	boolean power;
	int channel;
	
	void power()	{ power = !power; }
	void channelUP() { ++channel; }
	void channelDown() { --channel; }
}

class VCR {
	boolean power;
	int counter = 0;
	void power() {	power = !power; }
		void play() { }
		void stop() { }
		void rew() { }
		void ff() { }
	}

class TVCR extends Tv {
	VCR vcr = new VCR();
	
	void play() {
		vcr.play();
	}
	
	void stop() {
		vcr.stop();
	}
	void rew() {
		vcr.rew();
	}
	void ff() {
		vcr.ff();
	}
}

예제7-5

public class SuperTest {
	public static void main(String[] args) {
		Child c = new Child();
		c.method();
	}
}

class Parent {
	int x=10;
}

class Child extends Parent {
	void method() {
		System.out.println("x=" + x);
		System.out.println("this.x=" + this.x);
		System.out.println("super.x="+ super.x);
	}
}

x=10
this.x=10
super.x=10

예제7-6

public class SuperTest2 {
	public static void main(String[] args) {
		Child c = new Child();
		c.method();
	}
}

class Parent {
	int x=10;
}

class Child extends Parent {
	int x=20;
	void method() {
		System.out.println("x=" + x);
		System.out.println("this.x=" + this.x);
		System.out.println("super.x="+ super.x);
	}
}

x=20
this.x=20
super.x=10

예제7-7

public class PointTest {
	public static void main(String[] args) {
		Point3D p3 = new Point3D(1,2,3);
	}
}

class Point {
	int x, y;
	
	Point(int x, int y) {
		this.x = x;
		this.y = y;
	}
	
	String getLocation() {
		return "x :" + x + ", y :"+ y;
	}
}

class Point3D extends Point {
	int z;
	
	Point3D(int x, int y, int z) {
		
		this.x = x;
		this.y = y;
		this.z = z;
	}
	
	String getLocation() {
		return "x :" + x + ", y :" + y + ", z :" + z;
	}
}

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
	Implicit super constructor Point() is undefined. Must explicitly invoke another constructor

	at mypack.Point3D.<init>(PointTest.java:25)
	at mypack.PointTest.main(PointTest.java:5)

예제7-8

class PointTest2 {
	public static void main(String[] args) {
		Point3D p3 = new Point3D();
		System.out.println("p3.x="+ p3.x);
		System.out.println("p3.y="+ p3.y);
		System.out.println("p3.z="+ p3.z);

	}

}

class Point {
	int x = 10;
	int y = 20;

	Point(int x, int y) {

		this.x = x;
		this.y = y;
	}
}

class Point3D extends Point {
	int z = 30;

	Point3D() {
		this(100, 200, 300);
	}

	Point3D(int x, int y, int z) {
		super(x, y);
		this.z = z;
	}
}

p3.x=100
p3.y=200
p3.z=300

예제7-9

pacakge com.codechobo.book;

public class PackageTest {
	public static void main(String[] args) {
		System.out.println("Hello World!");
	}
}

예제7-10

public class ImportTest {
	public static void main(String[] args) {
		Date today = new Date();
		
		SimpleDateFormat date = new SimpleDateFormat("yyyy/mm/dd");
		SimpleDateFormat time = new SimpleDateFormat("hh:mm:ss a");
		
		System.out.println("오늘 날짜는 " + date.format(today));
		System.out.println("현재 시간은 " + time.format(today));
	}
}

오늘 날짜는 2021/30/26
현재 시간은 05:30:19 오전

예제7-11

import static java.lang.System.out;
import static java.lang.Math.*;

public class StaticImportEx1 {
	public static void main(String[] args) {
//		System.out.println(Math.random());
		out.println(random());
		
//		System.out.println("Math.PI :"+Math.PI);
		out.println("Math.PI :" + PI);
	}
}

0.16729015202127595
Math.PI :3.141592653589793

예제7-12

class Card {
	final int NUMBER;
	final String KIND;
	static int width = 100;
	static int height = 250;

	Card(String kind, int num) {
		KIND = kind;
		NUMBER = num;

	}

	Card() {
		this("HEART", 1);
	}

	public String toString() {
		return KIND + " " + NUMBER;
	}
}

class FinalCardTest {
	public static void main(String[] args) {
		Card c = new Card("HEART", 10);

//	c.NUMBER = 5;
		System.out.println(c.KIND);
		System.out.println(c.NUMBER);
		System.out.println(c);
	}
}

HEART
10
HEART 10

예제7-13

public class TimeTest {
	public static void main(String[] args) {
		Time t = new Time(12, 35, 30);
		System.out.println(t);
//		t.hour = 13;
		t.setHour(t.getHour() + 1); // 13을들고오고싶으면 getHour 바꾸고싶으면 setHour
		System.out.println(t);
	}
}

// VO, Component
class Time {
	private int hour, minute, second;
	boolean power;

	public Time(int hour, int minute, int second) {
		super();
		this.hour = hour;
		this.minute = minute;
		this.second = second;
	}
	public boolean isPower() {
		return power;
	}
	public void setPower(boolean power) {
		this.power = power;
	}
	public int getHour() {	return hour; }
	public void setHour(int hour) {
		
		if(hour < 0 || hour > 23) return;
		this.hour = hour;
	}
	
	public int getMinute() {	return minute; }
	public void setMinute(int minute) {
		
		if(minute < 0 || minute > 59) return;
		this.minute = minute;
	}
	public int getSecond() {	return second;}
	public void setSecond(int second) {
		if (second < 0 || second > 59) return;
		this.second = second;
	}
	public String toString() {
		return hour + ":" + minute + ":" + second;
	}

	}

12:35:30
13:35:30

예제7-14

final class Singleton {
	private static Singleton s = new Singleton();
	
	private Singleton() {
		//...
	}
	
	public static Singleton getInstance() {
		if(s==null)
			s = new Singleton();
		
		return s;
	}
}

class SingletonTest{
	public static void main(String[] args) {
//		Singleton s = new Singleton();
		Singleton s = Singleton.getInstance();
	}
}

예제7-15

public class CastingTest1 {
	public static void main(String[] args) {
		Car car = null;
		FireEngine fe = new FireEngine();
		FireEngine fe2 = null;

		fe.water();
		car = (Car)fe;	//Car타입의 참조형변수라고 명시하지 않아도 된다.
//		car.water();
		fe2 = (FireEngine) car;
		fe2.water();
	}
}

class Car {
	String color;
	int door;

	void drive() {
		System.out.println("drive, brrrr~");
	}

	void stop() {
		System.out.println("stop!!!");
	}
}

class FireEngine extends Car {
	void water() {
		System.out.println("water!!!");
	}
}

water!!!
water!!!

예제7-16

class CastingTest2 {
	public static void main(String[] args) {
		Car car = new Car();
		Car car2 = null;
		FireEngine fe = null;
		
		car.drive();
		fe = (FireEngine)car;
		fe.drive();
		car2 = fe;
		car2.drive();
	}
}

drive, brrrr~
Exception in thread "main" java.lang.ClassCastException: a210719.Car cannot be cast to a210719.FireEngine
	at a210719.CastingTest2.main(CastingTest2.java:10)

예제7-17

public class InstanceofTest {
	public static void main(String[] args) {
		FireEngine fe = new FireEngine();
		
		if(fe instanceof FireEngine) {
			System.out.println("This is a FireEngine instance.");
		}
		
		if(fe instanceof Car) {
			System.out.println("This is a Car instance.");
		}
		
		if(fe instanceof Object) {
			System.out.println("This is an Object instance.");
		}
		System.out.println(fe.getClass().getName());
	}
}// class
class Car {}
class FireEngine extends Car{}

This is a FireEngine instance.
This is a Car instance.
This is an Object instance.
FireEngine

예제7-18

public class BindingTest {
	public static void main(String[] args) {
		Parent p = new Child();
		Child c = new Child();
		
		System.out.println("p.x = " + p.x);
		p.method();
		
		System.out.println("c.x = " + c.x);
		c.method();
	}

}

class Parent {
	int x = 100;
	
	void method() {
		System.out.println("Parent Method");
	}
}

class Child extends Parent {
	int x = 200;
	
	void method() {
		System.out.println("Child Method");
	}
}

p.x = 100
Child Method
c.x = 200
Child Method

예제7-19

class BindingTest2 {
	public static void main(String[] args) {
		Parent p = new Child();
		Child c = new Child();

		System.out.println("p.x = " + p.x);
		p.method();

		System.out.println("c.x = " + c.x);
		c.method();
	}

}

class Parent {
	int x = 100;

	void method() {
		System.out.println("Parent Method");
	}
}
class Child extends Parent {
}

p.x = 100
Parent Method
c.x = 100
Parent Method

예제7-20

class BindingTest3 {
	public static void main(String[] args) {
		Parent p = new Child();
		Child c = new Child();

		System.out.println("p.x = " + p.x);
		p.method();
		System.out.println();
		System.out.println("c.x = " + c.x);
		c.method();
	}
}

class Parent {
	int x = 100;

	void method() {
		System.out.println("Parent Method");
	}
}

class Child extends Parent {
	int x = 200;

	void metohd() {
		System.out.println("x=" + x);
		System.out.println("super.x=" + super.x);
		System.out.println("this.x=" + this.x);
	}
}

p.x = 100
Parent Method

c.x = 200
Parent Method

예제7-21

class Product{
	int price;
	int bonusPoint;
	
	Product(int price) {
		this.price = price;
		bonusPoint = (int)(price/10.0);
	}
}
class Tv extends Product {
	Tv() {
		super(100);
	}
	public String toString() { return "Tv"; }
}
class Computer extends Product {
	Computer() { super(200); }
	
	public String toString() { return "Computer"; }
}

class Buyer {
	int money = 1000;
	int bonusPoint = 0;
	
	void buy(Product p) {
		if(money < p.price) {
			System.out.println("잔액이 부족하여 물건을 살 수 없습니다.");
			return;
		}
		
		money -= p.price;
		bonusPoint += p.bonusPoint;
		System.out.println(p + "을/를 구입하셨습니다.");
	}
}
class PolyArgumentTest {
	public static void main(String[] args) {
		Buyer b = new Buyer();
		
		b.buy(new Tv());
		b.buy(new Computer());
		
		System.out.println("현재 남은 돈은 " + b.money + "만원입니다.");
		System.out.println("현재 보너스 점수는" + b.bonusPoint + "점입니다.");
		
	}
}

Tv을/를 구입하셨습니다.
computer을/를 구입하셨습니다.
현재 남은 돈은 700만원입니다.
현재 보너스 점수는30점입니다.

예제7-22

class Product {
	int price;
	int bonusPoint;

	Product(int price) {
		this.price = price;
		bonusPoint = (int) (price / 10.0);
	}

	Product() {
	}
}

class Tv extends Product {
	Tv() {
		super(100);
	}

	public String toString() {
		return "Tv";
	}
}

class Computer extends Product {
	Computer() {
		super(200);
	}

	public String toString() {
		return "Computer";
	}
}

class Audio extends Product {
	Audio() {
		super(50);
	}

	public String toString() {
		return "Audio";
	}
}

class Buyer {
	int money = 1000;
	int bonusPoint = 0;
	Product[] item = new Product[10];
	int i = 0;

	void buy(Product p) {
		if (money < p.price) {
			System.out.println("잔액이 부족하여 물건을 살 수 없습니다.");
			return;
		}

		money -= p.price;
		bonusPoint += p.bonusPoint;
		item[i++] = p;
		System.out.println(p + "을/를 구입하셨습니다.");
	}

	void summary() {
		int sum = 0;
		String itemList = "";

		for (int i = 0; i < item.length; i++) {
			if (item[i] == null)
				break;
			sum += item[i].price;
			itemList += item[i] + ", ";
		}

		System.out.println("구입하신 물품의 총금액은 " + sum + "만원입니다.");
		System.out.println("구입하신 제품은 " + itemList + "입니다.");
	}
}

class PolyArgumentTest2 {
	public static void main(String args[]) {
		Buyer b = new Buyer();

		b.buy(new Tv());
		b.buy(new Computer());
		b.buy(new Audio());
		b.summary();
	}
}

Tv을/를 구입하셨습니다.
Computer을/를 구입하셨습니다.
Audio을/를 구입하셨습니다.
구입하신 물품의 총금액은 350만원입니다.
구입하신 제품은 Tv, Computer, Audio, 입니다.

예제7-23

import java.util.*;
	class Product {
		int price;
		int bonusPoint;
		
		Product(int price) {
			this.price = price;
			bonusPoint = (int)(price/10.0);
		}
		
		Product() {
			price = 0;
			bonusPoint = 0;
		}
	}



class Tv extends Product {
	Tv() { super(100); }
	public String toString() { return "Tv"; }
}

class Computer extends Product {
	Computer() { super(200); }
	public String toString() { return "computer";	}
}

class Audio extends Product {
	Audio() {	super(50);	}
	public String toString() {	return "Audio";	}
}

class Buyer {
	int money = 1000;
	int bonusPoint = 0;
	Vector<Product> item = new Vector<Product>();
	
	void buy(Product p) {
		if(money < p.price) {
			System.out.println("잔액이 부족하여 물건을 살 수 없습니다.");
			return;
		}
		money -= p.price;
		bonusPoint += p.bonusPoint;
		item.add(p);
		System.out.println(p + "을/를 구입하셨습니다.");
	}
	
	void refund(Product p) {
		if(item.remove(p)) {
			bonusPoint -= p.bonusPoint;
			System.out.println(p + "을/를 반품하셨습니다.");
		} else { System.out.println("구입하신 제품 중 해당 제품이 없습니다.");
	}
}
	
void summary() {
	int sum = 0;
	String itemList ="";
	
	if(item.isEmpty()) {
		System.out.println("구입하신 제품이 없습니다.");
		return;
	}
	
	for(int i = 0; i < item.size();i++) {
		Product p = (Product)item.get(i);
		sum += p.price;
		itemList += (i==0) ? "" + p : ", " + p;
	}
	System.out.println("구입하신 물품의 총금액은 " + sum + "만원입니다.");
	System.out.println("구입하신 제품은 "+ itemList + "입니다.");
}
}

public class PolyArgumentTest3 {
	public static void main(String[] args) {
		Buyer b = new Buyer();
		Tv tv = new Tv();
		Computer com = new Computer();
		Audio audio = new Audio();

		b.buy(tv);
		b.buy(com);
		b.buy(audio);
		b.summary();
		System.out.println();
		b.refund(com);
		b.summary();
	}
}

Tv을/를 구입하셨습니다.
computer을/를 구입하셨습니다.
Audio을/를 구입하셨습니다.
구입하신 물품의 총금액은 350만원입니다.
구입하신 제품은 Tv, computer, Audio입니다.

computer을/를 반품하셨습니다.
구입하신 물품의 총금액은 150만원입니다.
구입하신 제품은 Tv, Audio입니다.

예제7-24

public class FighterTest {
	public static void main(String[] args) {
		Fighter f = new Fighter();
		Fightable fightable = new Fighter();
				
		if(f instanceof Unit) {
			System.out.println("f는 Unit의 자손입니다");
		}
		if(f instanceof Fightable) {
			System.out.println("f는 Fightable인터페이스를 구현했습니다");
		}
		if(f instanceof Attackable) {
			System.out.println("f는 Attackable인터페이스를 구현했습니다");
		}
		if(f instanceof Movable) {
			System.out.println("f는 Movable인터페이스를 구현했습니다");
		}
		if(f instanceof Object) {
			System.out.println("f는 Object클래스의 자손입니다");
		}
		
	}
}

class Fighter extends Unit implements Fightable {
	public void attack(Unit u) {
		// 내용생략
	}
	public void move(int x, int y) {
		// 내용생략
	}
}
class Unit {
	int currentHP;
	int x;
	int y;
	
}
interface Fightable extends Movable, Attackable{}
interface Movable { void move(int x, int y); }
interface Attackable { void attack(Unit u); }

f는 Unit의 자손입니다
f는 Fightable인터페이스를 구현했습니다
f는 Attackable인터페이스를 구현했습니다
f는 Movable인터페이스를 구현했습니다
f는 Object클래스의 자손입니다

예제7-25

interface Parseable {
	public abstract void parse(String fileName);
}

class ParserManager {
	public static Parseable getParser(String type) {
		if (type.equals("XML")) {
			return new XMLParser();
		} else {
			Parseable p = new HTMLParser();
			return p;
		}

	}
}

class XMLParser implements Parseable {
	@Override
	public void parse(String fileName) {
		System.out.println(fileName + "- XML parsing completed.");
	}
}

class HTMLParser implements Parseable {
	@Override
	public void parse(String fileName) {
		System.out.println(fileName + "-HTML parsing completed.");

	}
}

class parserTest {
	public static void main(String args[]) {
		Parseable parser = ParserManager.getParser("XML");
		parser.parse("document.xmml");
		parser = ParserManager.getParser("HTML");
		parser.parse("document2.html");
	}
}

예제7-26

public class RepairableTest {
	public static void main(String[] args) {
		Tank tank = new Tank();
		Dropship dropship = new Dropship();
		
		Marine marine = new Marine();
		SCV scv = new SCV();
		scv.repair(tank);
		scv.repair(dropship);
//		scv.repair(marine);
	}
}

interface Repairable{}

class Unit {
	int hitPoint;
	final int MAX_HP;
	Unit(int hp) {
		MAX_HP = hp;
	}
	//...
}

class GroundUnit extends Unit {
	GroundUnit(int hp) {
		super(hp);
	}
}

class AirUnit extends Unit {
	AirUnit(int hp) {
		super(hp);
	}
}


class Tank extends GroundUnit implements Repairable {
	Tank() {
		super(150);
		hitPoint = MAX_HP;
	}
	
	public String toString() {
		return "Tank";
	}
	//...
}

class Dropship extends AirUnit implements Repairable {
	Dropship() {
		super(125);
		hitPoint = MAX_HP;
	}
	
	public String toString() {
		return "Dropship";
	}
	//...
}

class Marine extends GroundUnit {
	Marine() {
		super(40);
		hitPoint = MAX_HP;
	}
	//...
}

class SCV extends GroundUnit implements Repairable{
	SCV() {
		super(60);
		hitPoint = MAX_HP;
	}
	
	void repair(Repairable r) {
		if (r instanceof Unit) {
			Unit u = (Unit)r;
			while(u.hitPoint!=u.MAX_HP) {
				u.hitPoint++;
			}
			System.out.println( u.toString() + "의 수리가 끝났습니다.");
		}
		//...
	}
}

Tank의 수리가 끝났습니다.
Dropship의 수리가 끝났습니다.

예제7-27

class A {
	public void methodA(B b) {
		b.methodB();
	}
}

class B  {
	public void methodB() {
		System.out.println("methodB()");
	}
}

public class InterfaceTest {
	public static void main(String[] args) {
		A a = new A();
		a.methodA(new B());
	}
}

methodB()

예제7-28

class A {
	void autoPlay(I i) {
		i.play();
	}
}

interface I {
	public abstract void play();
}

class B implements I {
	public void play() {
		System.out.println("play in B class");
	}
}

class C implements I {
	public void play() {
		System.out.println("play in C class");
	}
}

class InterfaceTest2 {
	public static void main(String[] args) {
		A a = new A();
		a.autoPlay(new B());
		a.autoPlay(new C());
	}
}

play in B class
play in C class

예제7-29

public class InterfaceTest3 {
	public static void main(String[] args) {
		A a = new A();
		a.methodA();
	}
}

class A {
	void methodA() {
		I i = InstanceManager.getInstance();
		i.methodB();
		System.out.println(i.toString());
	}
}

interface I {
	public abstract void methodB();
}

class B implements I {
	public void methodB() {
		System.out.println("methodB in B class");
	}

	public String toString() {
		return "class B";
	}
}

class InstanceManager {
	public static I getInstance() {
		return new B();
	}
}

methodB in B class
class B

예제7-30

public class DefaultMethodTest {
	public static void main(String[] args) {
		Child c = new Child();
		c.method1();
		c.method2();
		MyInterface.staticMethod();
		MyInterface2.staticMethod();
	}
}

class Child extends Parent implements MyInterface, MyInterface2 {
	public void method1() {
		System.out.println("method1() in Child"); // 오버라이딩
	}
}

class Parent {
	public void method2() {
		System.out.println("method2() in Parent");
	}
}

interface MyInterface {
	default void method1() {
		System.out.println("method1() in MyInterface");
	}

	default void method2() {
		System.out.println("method2() in MyInterface");
	}

	static void staticMethod() {
		System.out.println("staticMethod() in MyInterface");
	}
}

interface MyInterface2 {
	default void method1() {
		System.out.println("method1() in MyInterface2");
	}

	static void staticMethod() {
		System.out.println("staticMethod() in MyInterface2");
	}
}

method1() in Child
method2() in Parent
staticMethod() in MyInterface
staticMethod() in MyInterface2

예제 7-31

class InnerEx1 {
	class InstanceInner {
		int iv = 100;
//		static int cv = 100;
		final static int CONST = 100;
	}

	static class StaticIneer {
		int iv = 200;
		static int cv = 200;
	}

	void myMethod() {
		class LocalInner {
			int iv = 300;
//			static int cv = 300;
			final static int CONST = 300;
		}
	}

	public static void main(String[] args) {
		System.out.println(InstanceInner.CONST);
		System.out.println(StaticIneer.cv);
	}
}

100
200

예제 7-32

class InnerEx2 {
	class InstanceInner {
	}

	static class StaticInner {
	}

	InstanceInner iv = new InstanceInner();
	static StaticInner cv = new StaticInner();

	static void staticMethod() {
//		InstanceInner obj1 = new InstanceInner();
		StaticInner obj2 = new StaticInner();

		InnerEx2 outer = new InnerEx2();
		InstanceInner obj1 = outer.new InstanceInner();
	}

	void instanceMethod() {
		InstanceInner obj1 = new InstanceInner();
		StaticInner obj2 = new StaticInner();
//		LocalInner lv = new LocalInner();
	}

	void myMethod() {
		class LocalInner {
		}
		LocalInner lv = new LocalInner();
	}
}

예제7-33

class InnerEx3 {
	private int outerIv = 0;
	static int outerCv = 0;
	
	class InstanceInner {
		int iiv = outerIv;
		int iiv2 = outerCv;
	}
	
	static class StaticInner {
//		int siv = outerIv;
		static int scv = outerCv;
	}
	
	void myMethod() {
		int lv = 0;
		final int LV = 0;
		
		class LocalInner {
			int liv = outerIv;
			int liv2 = outerCv;
			int liv3 = lv;
			int liv4 = LV;
		}
	}

}

예제7-34

class Outer {
	class InstanceInner {
		int iv = 100;
	}
	
	static class StaticInner{
		int iv = 200;
		static int cv = 300;
	}
	
	void myMethod() {
		class LocalInner {
			int iv = 400;
		}
	}

}

class InnerEx4 {
	public static void main(String[] args) {
		Outer oc = new Outer();
		Outer.InstanceInner ii = oc.new InstanceInner();
		
		System.out.println("ii.iv : "+ ii.iv);
		System.out.println("Outer.StaticInner.cv : "+ Outer.StaticInner.cv);
		
		Outer.StaticInner si = new Outer.StaticInner();
		System.out.println("si.iv : "+ si.iv);
	}
}

ii.iv : 100
Outer.StaticInner.cv : 300
si.iv : 200

예제 7-35

class Outer {
	int value = 10;

	class Inner {
		int value = 20;

		void method1() {
			int value = 30;
			System.out.println("value :" + value);
			System.out.println("this.value :" + this.value);
			System.out.println("Outer.this.value :" + Outer.this.value);
		}
	}

}

class InnerEx5 {
	public static void main(String[] args) {
		Outer outer = new Outer();
		Outer.Inner inner = outer.new Inner();
		inner.method1();
	}
}

value :30
this.value :20
Outer.this.value :10

예제7-36

public class InnerEx6 {
	Object iv = new Object () { void method() {} };
	static Object cv = new Object() { void method() {} };
	
	void myMethod() {
		Object lv = new Object() { void method() {} };
	}
}

예제7-37

import java.awt.*;
import java.awt.event.*;

class InnerEx7 {
	public static void main(String[] args) {
		Button b = new Button("Start");
		b.addActionListener(new EventHandler());
	}
}
class EventHandler implements ActionListener {
	public void actionPerformed(ActionEvent e) {
		System.out.println("ActionEvent occurred!!!");
	}
}

예제7-38

import java.awt.*;
import java.awt.event.*;

class InnerEx8 {
	public static void main(String[] args) {
		Button b = new Button("Start");
		b.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				System.out.println("ActionEvent occurred!!!");
			}
		});
	}
}

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