[Java] 자바의 정석 / chap7.객체지향 프로그래밍_연습문제

7-1)

package example01;

class SutdaDeck {
	final int CARD_NUM = 20;
	SutdaCard[] cards = new SutdaCard[CARD_NUM];

	SutdaDeck() {
		for (int i = 0; i < cards.length; i++) {
			int num = i % 10 + 1;
			boolean isKwang = (i < 10) && (num == 1 || num == 3 || num == 8);

			cards[i] = new SutdaCard(num, isKwang);
		}
	}
}

class SutdaCard {
	int num;
	boolean isKwang;

	SutdaCard() {
		this(1, true);
	}

	SutdaCard(int num, boolean isKwang) {
		this.num = num;
		this.isKwang = isKwang;
	}

	public String toString() {
		return num + (isKwang ? "K" : "");
	}
}

public class Ex05_Chapter7 {

	public static void main(String[] args) {
		SutdaDeck deck = new SutdaDeck();

		for (int i = 0; i < deck.cards.length; i++) {
			System.out.print(deck.cards[i] + ",");
		}
	}

}

 

 

7-2)

package example01;

class SutdaDeck {
	final int CARD_NUM = 20;
	SutdaCard[] cards = new SutdaCard[CARD_NUM];

	SutdaDeck() {
		for (int i = 0; i < cards.length; i++) {
			int num = i % 10 + 1;
			boolean isKwang = (i < 10) && (num == 1 || num == 3 || num == 8);

			cards[i] = new SutdaCard(num, isKwang);
		}	
	}
	
	public void shuffle() {
		for (int i = 0; i < cards.length; i++) {
			int rNum = (int)(Math.random() * cards.length);
			
			SutdaCard temp = cards[i];
			cards[i] = cards[rNum];
			cards[rNum] = temp;
		}
	}//shuffle()
	
	public SutdaCard pick(int index) {
		if (index < 0 || index >= CARD_NUM) {
			return null;
		}
		return cards[index];
	}//pick(int index)
	
	public SutdaCard pick() {
		int rNum = (int)(Math.random() * cards.length);
		return cards[rNum];
		//return pick(rNum);  //pick(int index) 호출도 가능
	}//pick()
	
}//Class SutdaDeck

class SutdaCard {
	int num;
	boolean isKwang;

	SutdaCard() {
		this(1, true);
	}

	SutdaCard(int num, boolean isKwang) {
		this.num = num;
		this.isKwang = isKwang;
	}

	public String toString() {
		return num + (isKwang ? "K" : "");
	}
}//Class SutdaCard

public class Ex05_Chapter7 {

	public static void main(String[] args) {
		SutdaDeck deck = new SutdaDeck();
		
		System.out.println(deck.pick(0));
		System.out.println(deck.pick());
		deck.shuffle();

		for (int i = 0; i < deck.cards.length; i++) {
			System.out.print(deck.cards[i] + ",") ;
		}
		
		System.out.println();
		System.out.println(deck.pick(0));
	}

}

Math.random() 사용하는 경우, 실행결과가 다를 수 있음

 

 

7-3)

package example01;

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

class Tv extends Product {
	//기본 생성자
	Tv() {}
	//= Tv() {super();} => super() 호출
	
	public String toString() {
		return "Tv";
	}
}//class Tv

public class Ex05_Chapter7 {

	public static void main(String[] args) {
		Tv t = new Tv();
	}

}

 

 

7-4)

package example01;

class MyTv {
	boolean isPowerOn;
	int channel;
	int volume;
	
	final int MAX_VOLUME = 100;
	final int MIN_VOLUME = 0;
	final int MAX_CHANNEL = 100;
	final int MIN_CHANNEL = 1;
	
	public void setChannel(int channel) {
		if (channel > MAX_CHANNEL || channel < MIN_CHANNEL) {
			return;
		}
		this.channel = channel;
	}
	public int getChannel() {
		return channel;
	}
	
	public void setVolume(int volume) {
		if (volume > MAX_VOLUME || volume < MIN_VOLUME) {
			return;
		}
		this.volume = volume;
	}
	public int getVolume() {
		return volume;
	}
	
}
public class Ex05_Chapter7 {

	public static void main(String[] args) {
		MyTv t = new MyTv();
		
		t.setChannel(10);
		System.out.println("CH: " + t.getChannel());
		t.setVolume(20);
		System.out.println("VOL: " + t.getVolume());
	}

}

 

 

7-5)

package example01;

class MyTv2 {
	private boolean isPowerOn;
	private int channel;
	private int volume;
	private int preChannel;
	
	final int MAX_VOLUME = 100;
	final int MIN_VOLUME = 0;
	final int MAX_CHANNEL = 100;
	final int MIN_CHANNEL = 1;
	
	public void setChannel(int channel) {
		if (channel > MAX_CHANNEL || channel < MIN_CHANNEL) {
			return;
		}
		preChannel = this.channel;
		this.channel = channel;
	}
	public int getChannel() {
		return channel;
	}
	
	public void setVolume(int volume) {
		if (volume > MAX_VOLUME || volume < MIN_VOLUME) {
			return;
		}
		this.volume = volume;
	}
	public int getVolume() {
		return volume;
	}
	
	public void gotoPreChannel() {
		setChannel(preChannel);
	}
	
}
public class Ex05_Chapter7 {

	public static void main(String[] args) {
		MyTv2 t = new MyTv2();
		
		t.setChannel(10);
		System.out.println("CH: " + t.getChannel());
		t.setChannel(20);
		System.out.println("CH: " + t.getChannel());
		t.gotoPreChannel();
		System.out.println("CH: " + t.getChannel());
		t.gotoPreChannel();
		System.out.println("CH: " + t.getChannel());
	}

}

 

 

7-6)

package j10_Exception;

class Outer {
	class Inner {
		int iv = 100;
	}
}


public class Ex05_Chapter7 {

	public static void main(String[] args) {
		Outer o = new Outer();
		Outer.Inner i = o.new Inner();
		
		System.out.println(i.iv);
	}

}

 

 

7-7)

package j10_Exception;

class Outer {
	static class Inner {
		int iv = 200;
	}
}


public class Ex05_Chapter7 {

	public static void main(String[] args) {
		Outer.Inner si = new Outer.Inner();
		System.out.println(si.iv);
	}

}

 

 

7-8)

package j10_Exception;

class Outer {
	int value = 10;

	class Inner {
		int value = 20;

		void method1() {
			int value = 30;

			System.out.println(value);
			System.out.println(this.value);
			System.out.println(Outer.this.value);
		}
	}
}

public class Ex05_Chapter7 {

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

}

 

 

7-9)

package j10_Exception;

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

public class Ex05_Chapter7 {

	public static void main(String[] args) {
		Frame f = new Frame();
		f.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				e.getWindow().setVisible(false);
				e.getWindow().dispose();
				System.exit(0);
			}
		});

	}

}

 

 

.......어제 저녁에 풀고

아침에.......... 이어서 풀었는데

왤케 어려워...?

 

눈물날 거 같아............................................