명품 자바 프로그래밍 12장 실습 문제

✏️ 12장 실습문제 - 1번

// 1번
package ex;

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;

public class SolveProblem extends JFrame {

    private MyPanel panel = new MyPanel();

    public SolveProblem() {
        setTitle("이미지 그리기 연습");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setContentPane(panel);
        setVisible(true);
        setSize(400, 200);
    }

    class MyPanel extends JPanel {
        private JButton HideShow = new JButton("Hide/Show");
        private ImageIcon icon = new ImageIcon("images/티스토리.jpg");
        private Image image = icon.getImage();

        public MyPanel() {
            setLayout(new FlowLayout());
            add(HideShow);
        }

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.drawImage(image, 0, 0, this.getWidth(), this.getHeight(), this);
        }
    }


    public static void main(String[] args) {
        new SolveProblem();
    }

}

//2번
package ex;

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;

public class SolveProblem extends JFrame {

    private MyPanel panel = new MyPanel();

    public SolveProblem() {
        setTitle("이미지 그리기 연습");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setContentPane(panel);
        setVisible(true);
        setSize(400, 200);
    }

    class MyPanel extends JPanel {
        private JButton HideShow = new JButton("Hide/Show");
        private ImageIcon icon = new ImageIcon("images/티스토리.jpg");
        private Image image = icon.getImage();

        public MyPanel() {
            setLayout(new FlowLayout());
            add(HideShow);
            HideShow.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    if(image==null)
                        image = icon.getImage();
                    else
                        image=null;
                    repaint();
                }
            });
        }

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.drawImage(image, 0, 0, this.getWidth(), this.getHeight(), this);
        }
    }

    public static void main(String[] args) {
        new SolveProblem();
    }

}

 

✏️ 12장 실습문제 - 2번

package ex;

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;

public class SolveProblem extends JFrame {

    private MyPanel panel = new MyPanel();

    public SolveProblem() {
        setTitle("이미지 위에 원 드래깅 연습");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setContentPane(panel);
        setVisible(true);
        setSize(400, 200);
    }

    class MyPanel extends JPanel {
        private JButton HideShow = new JButton("Hide/Show");
        private ImageIcon icon = new ImageIcon("images/티스토리.jpg");
        private Image image = icon.getImage();
        private Point point = new Point(50, 50);

        public MyPanel() {
            setLayout(new FlowLayout());
            add(HideShow);
            this.addMouseListener(new MouseAdapter() {
                @Override
                public void mouseClicked(MouseEvent e) {
                    point = e.getPoint();
                    repaint();
                }
            });
        }

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.drawImage(image, 0, 0, this.getWidth(), this.getHeight(), this);
            g.setColor(Color.GREEN);
            g.fillOval((int)point.getX(),(int)point.getY(),20,20);
        }
    }


    public static void main(String[] args) {
        new SolveProblem();
    }
}

 

✏️ 12장 실습문제 - 3번

package ex;

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;

public class SolveProblem extends JFrame {

    private ImageIcon icon = new ImageIcon("images/네블.jpg");
    private JLabel label = new JLabel(icon);

    public SolveProblem() {
        setTitle("이미지 레이블 드래깅 연습");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container c = getContentPane();
        c.setLayout(null);

        label.setLocation(50,50);
        label.setSize(icon.getIconWidth(),icon.getIconHeight());
        c.add(label);

        label.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseDragged(MouseEvent e) {
                Point p = e.getPoint();
                label.setLocation((int)p.getX(),(int)p.getY());
            }
        });

        setSize(400, 200);
        setVisible(true);
    }
    
    public static void main(String[] args) {
        new SolveProblem();
    }
}

 

✏️ 12장 실습문제 - 4번

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class SolveProblem extends JFrame {
    private MyPanel panel = new MyPanel();
    private ImageIcon appleIcon = new ImageIcon("images/1.png");
    private Image appleImage = appleIcon.getImage();
    private int x = 50;
    private int y = 50;
    private int width = appleImage.getWidth(this);
    private int height = appleImage.getHeight(this);

    public SolveProblem() {
        setTitle("이미지 레이블 드래깅 연습");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setContentPane(panel);
        setSize(500, 500);
        setVisible(true);
    }

    class MyPanel extends JPanel {
        boolean okayToMove = false;

        public MyPanel() {
            setFocusable(true);
            requestFocus();

            addMouseListener(new MouseAdapter() {
                public void mousePressed(MouseEvent e) { //마우스가 눌러졌을 때
                    Point startP = e.getPoint();  //현재 마우스의 위치
                    if (startP.getX() >= x && startP.getX() <= x + width)
                        if (startP.getY() >= y && startP.getY() <= y + height)
                            okayToMove = true;
                    //마우스가 이미지 영역 안에 있는지 확인하고 이동 가능하다는 것을 표현
                }

                public void mouseReleased(MouseEvent e) {  //눌렀던 버튼을 뗐을 때
                    if (okayToMove == true) {  //이동 가능한 상태였다면
                        Point endP = e.getPoint();  //현재 마우스 위치
                        x = (int) endP.getX() - width / 2;
                        y = (int) endP.getY() - height / 2;  //이동할 위치 설정
                        okayToMove = false;
                        repaint();  //변경된 위치에 출력
                    }
                }
            });
        }

        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.drawImage(appleImage, x, y, width, height, this);
        }
    }

    public static void main(String[] args) {
        new SolveProblem();
    }
}

 

✏️ 12장 실습문제 - 5번

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class SolveProblem extends JFrame {
    private MyPanel panel = new MyPanel();
    private ImageIcon appleIcon = new ImageIcon("images/가위.jpg");
    private Image appleImage = appleIcon.getImage();
    private int x = 50;
    private int y = 50;
    private int width = appleImage.getWidth(this);
    private int height = appleImage.getHeight(this);

    public SolveProblem() {
        setTitle("이미지 레이블 드래깅 연습");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setContentPane(panel);
        setSize(500, 500);
        setVisible(true);
    }

    class MyPanel extends JPanel {

        public MyPanel() {
            setFocusable(true);
            requestFocus();
            addKeyListener(new KeyAdapter() {
                @Override
                public void keyTyped(KeyEvent e) {
                    if(e.getKeyChar()=='+'){
                        width *=1.1;
                        height*=1.1;
                    }
                    else if(e.getKeyChar()=='-'){
                        width*=0.9;
                        height*=0.9;
                    }
                    repaint();
                }
            });
        }

        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.drawImage(appleImage, x, y, width, height, this);
        }
    }

    public static void main(String[] args) {
        new SolveProblem();
    }

}

 

✏️ 12장 실습문제 - 6번

// 1번
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class SolveProblem extends JFrame {
    private MyPanel panel = new MyPanel();
    private ImageIcon appleIcon = new ImageIcon("images/가위.jpg");
    private Image appleImage = appleIcon.getImage();
    private int x = 50;
    private int y = 50;
    private int width = appleImage.getWidth(this);
    private int height = appleImage.getHeight(this);

    public SolveProblem() {
        setTitle("이미지 레이블 드래깅 연습");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setContentPane(panel);
        setSize(500, 500);
        setVisible(true);
    }

    class MyPanel extends JPanel {
        int width = this.getWidth() / 10;
        int height = this.getHeight() / 10;

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            for (int i = 0; i < 10; i++) {
                g.drawLine(0, (this.getHeight() / 10) * i, this.getWidth(), (this.getHeight() / 10) * i);
                g.drawLine((this.getWidth() / 10) * i, 0, (this.getWidth() / 10) * i, this.getHeight());
            }
        }
    }

    public static void main(String[] args) {
        new SolveProblem();
    }

}

// 2번
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class SolveProblem extends JFrame {
    private MyPanel panel = new MyPanel();
    private ImageIcon appleIcon = new ImageIcon("images/가위.jpg");
    private Image appleImage = appleIcon.getImage();
    private int x = 50;
    private int y = 50;
    private int width = appleImage.getWidth(this);
    private int height = appleImage.getHeight(this);

    public SolveProblem() {
        setTitle("이미지 레이블 드래깅 연습");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setContentPane(panel);
        setSize(500, 500);
        setVisible(true);
    }

    class MyPanel extends JPanel {
        int width = this.getWidth() / 2;
        int height = this.getHeight() / 2;

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            int w = this.getWidth();
            int h = this.getHeight();
            int[] x = { w / 2, 0, w / 2, w }; // 위 왼쪽 아래 오른쪽
            int[] y = { 0, h / 2, h, h / 2 };
            int xSpace = (int) this.getWidth() / 30;
            int ySpace = (int) this.getHeight() / 30;
            g.drawPolygon(x, y, 4);
            for (int i = 1; i < 10; i++) {
                y[0] += ySpace;
                x[1] += xSpace;
                y[2] -= ySpace;
                x[3] -= xSpace;
                g.drawPolygon(x, y, 4);
            }
        }
    }

    public static void main(String[] args) {
        new SolveProblem();
    }

}

 

✏️ 12장 실습문제 - 7번

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class SolveProblem extends JFrame {

    private MyPanel panel = new MyPanel();
    private int []x = new int[100];
    private int []y = new int[100];
    private int index=0;

    public SolveProblem(){
        setTitle("마우스로 폐다각형 그리기");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setContentPane(panel);
        setVisible(true);
        setSize(400,200);
    }

    class MyPanel extends JPanel{
        public MyPanel(){
            setFocusable(true);
            requestFocus();

            addMouseListener(new MouseAdapter() {
                @Override
                public void mouseClicked(MouseEvent e) {
                    Point p = e.getPoint();
                    x[index]=(int)p.getX();
                    y[index]=(int)p.getY();
                    index++;
                    repaint();
                }
            });
        }

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.drawPolygon(x,y,index);
        }
    }
    public static void main(String[] args) {
        new SolveProblem();
    }

}

 

✏️ 12장 실습문제 - 8번

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Vector;

public class SolveProblem extends JFrame {

    private MyPanel panel = new MyPanel();
    private Vector<Circle> v = new Vector<>();
    private int x, y, width, height;
    Point p;

    public SolveProblem() {
        setTitle("마우스로 원 그리기");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setContentPane(panel);
        setVisible(true);
        setSize(400, 200);
    }

    class MyPanel extends JPanel {
        Point startP, endP;

        public MyPanel() {
            setFocusable(true);
            requestFocus();

            addMouseListener(new MouseAdapter() {
                @Override
                public void mouseClicked(MouseEvent e) { // 중심 좌표를 Circle 객체에 만들어서 저장
                    startP = e.getPoint();
                }
            });

            addMouseListener(new MouseAdapter() {
                @Override
                public void mouseReleased(MouseEvent e) {
                    endP = e.getPoint();
                    x = (int) startP.getX();
                    y = (int) endP.getY();
                    width = (int) (Math.sqrt((Math.pow(startP.x - endP.x, 2) + Math.pow(startP.y - endP.y, 2))) * 2);
                    height = (int) (Math.sqrt((Math.pow(startP.x - endP.x, 2) + Math.pow(startP.y - endP.y, 2))) * 2);
                    Circle circle = new Circle(x,y,width,height);
                    v.add(circle);
                    repaint();
                }
            });
        }

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            for (int i = 0; i<v.size();i++){
                g.drawOval(v.get(i).x,v.get(i).y,v.get(i).width,v.get(i).height);
            }

        }
    }

    public static void main(String[] args) {
        new SolveProblem();
    }
}

class Circle {
    public  int x, y, width, height;

    public Circle(int x, int y, int width, int height) {
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
    }
}

 

✏️ 12장 실습문제 - 9번

package ex;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;

public class SolveProblem extends JFrame{
    public SolveProblem() {
        setTitle("Blue Label 만들기");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container c =getContentPane();
        c.setLayout(new FlowLayout());

        MyPanel helloLabel = new MyPanel("hello");
        helloLabel.setForeground(Color.YELLOW);
        helloLabel.setFont(new Font("Arial",Font.ITALIC,10));
        helloLabel.setOpaque(true);

        MyPanel BigHelloLabel = new MyPanel("Big Hello");
        BigHelloLabel.setForeground(Color.YELLOW);
        BigHelloLabel.setFont(new Font("Arial",Font.ITALIC,10));
        BigHelloLabel.setOpaque(true);

        c.add(helloLabel);
        c.add(BigHelloLabel);

        setVisible(true);
        setSize(400,200);
    }

    class MyPanel extends JLabel {
        public MyPanel(String s){
            super(s);
        }

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            setBackground(Color.blue);
        }
    }

    public static void main(String[] args) {
        new SolveProblem();
    }
}

 

✏️ 12장 실습문제 - 10번

package ex;

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;

public class SolveProblem extends JFrame {

    private MyPanel panel = new MyPanel();
    private ImageIcon icon = new ImageIcon("images/인스타.jpg");
    private Image image = icon.getImage();
    private int width, height;
    private int[] x = new int[4]; // 이미지를 그리기 시작할 좌표
    private int[] y = new int[4]; // 이미지를 그리기 시작할 좌표

    public SolveProblem() {
        setTitle("그래픽 이미지 연습");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setContentPane(panel);
        setVisible(true);
        setSize(400, 400);
    }


    class MyPanel extends JPanel {
        
        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            int width = getWidth();
            int height = getHeight();
            int imgwidth = this.getWidth();
            int imgheight = this.getHeight();

            g.drawImage(image, 0, 0, (width-10)/2, (height-10)/2, 0, 0, imgwidth/2, imgheight/2, this);
            g.drawImage(image, (width+10)/2, 0, width, (height-10)/2, imgwidth/2, 0, imgwidth, imgheight/2, this);
            g.drawImage(image, 0, (height+10)/2, (width-10)/2, height, 0, imgheight/2, imgwidth/2, imgheight, this);
            g.drawImage(image, (width+10)/2, (height+10)/2, width, height, imgwidth/2, imgheight/2, imgwidth, imgheight, this);
        }
    }
    public static void main(String[] args) {
        new SolveProblem();
    }
}

 

✏️ 12장 실습문제 - 11번

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class SolveProblem extends JFrame{
    JTextField[] amount=new JTextField[4];
    int sum=0;
    String[] fruit= {"apple", "cherry", "strawverry", "prune"};

    ImageIcon image=new ImageIcon("image/blue_square.png");
    Image img=image.getImage();

    SolveProblem(){
        setSize(550,400);
        setTitle("파이 차트 그리기");
        setLayout(new FlowLayout());
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        addKeyListener(new MyKeyListener());

        JPanel base=new JPanel();
        base.setLayout(new FlowLayout());
        JLabel[] specise=new JLabel[4];
        base.setBackground(Color.LIGHT_GRAY);
        base.setOpaque(true);

        for(int i=0; i<4; i++) {
            amount[i]=new JTextField(7);
            specise[i]=new JLabel(fruit[i]);
            amount[i].addKeyListener(new MyKeyListener());
            amount[i].setText("0");
            base.add(specise[i]);
            base.add(amount[i]);
        }

        MyPanel graph=new MyPanel();
        setContentPane(graph);

        add(base, BorderLayout.NORTH);

        setVisible(true);
        requestFocus();
    }

    class MyPanel extends JPanel{
        public void paintComponent(Graphics g) {
            int apple=0, cherry=0, strawberry=0, prune=0;
            super.paintComponent(g);



            for(int i=0; i<4; i++) {
                sum+=Integer.parseInt(amount[i].getText());
            }

            if(sum!=0) {
                apple=(int)((Integer.parseInt(amount[0].getText())*360)/sum);
                cherry=(int)((Integer.parseInt(amount[1].getText())*360)/sum);
                strawberry=(int)((Integer.parseInt(amount[2].getText())*360)/sum);
                prune=(int)((Integer.parseInt(amount[3].getText())*360)/sum);

                g.setFont(new Font("arial", Font.BOLD, 10));
                g.setColor(Color.RED);
                g.drawString("apple "+(int)(apple*100/360)+"%", 60,60);
                g.fillArc(125,100,200,200,0,apple);
                g.setColor(Color.BLUE);
                g.drawString("cherry "+(int)(cherry*100/360)+"%", 160,60);
                g.fillArc(125,100,200,200,apple,cherry);
                g.setColor(Color.MAGENTA);
                g.drawString("strawberry "+(int)(strawberry*100/360)+"%", 260,60);
                g.fillArc(125,100,200,200,apple+cherry,+strawberry);
                g.setColor(Color.YELLOW);
                g.drawString("prune "+(int)(prune*100/360)+"%", 360, 60);
                g.fillArc(125,100,200,200,apple+cherry+strawberry,prune);
            }
        }
    }

    class MyKeyListener extends KeyAdapter{
        public void keyPressed(KeyEvent e) {
            if(e.getKeyChar()=='\n') {
                repaint();
            }
        }
    }

    public static void main(String[] args) {
        new SolveProblem();
    }

}