명품 자바 프로그래밍 11장 실습 문제

✏️ 11장 실습문제 - 1번

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

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

      JCheckBox checkBox1 = new JCheckBox("버튼 비활성화");
      JCheckBox checkBox2 = new JCheckBox("버튼 감추기");
      JButton button = new JButton("test button");

      c.add(checkBox1);
      c.add(checkBox2);
      c.add(button);

      checkBox1.addItemListener(new ItemListener() {
          @Override
          public void itemStateChanged(ItemEvent e) {
              JCheckBox checkBox = (JCheckBox)e.getSource();
              if(checkBox.isSelected()==true)
                  button.setEnabled(false);
              else
                  button.setEnabled(true);
          }
      });

      checkBox2.addItemListener(new ItemListener() {
          @Override
          public void itemStateChanged(ItemEvent e) {
              JCheckBox checkBox = (JCheckBox)e.getSource();
              if(checkBox.isSelected()==true)
                  button.setVisible(false);
              else
                  button.setVisible(true);
          }
      });

      setVisible(true);
      setSize(300,150);
    }

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

 

✏️ 11장 실습문제 - 2번

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

public class SolveProblem extends JFrame{
    public SolveProblem(){
      setTitle("JTextFiled and Jcomponent");
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      Container c =getContentPane();
      c.setLayout(new FlowLayout());

      JTextField jTextField = new JTextField(20);
      JComboBox<String> jComboBox = new JComboBox<>();

      c.add(jTextField);
      c.add(jComboBox);

      jTextField.addActionListener(new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent e) {
              JTextField text = (JTextField)e.getSource();
              String string = text.getText();
              jComboBox.addItem(string);
          }
      });

      setVisible(true);
      setSize(300,150);
    }

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

 

✏️ 11장 실습문제 - 3번

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

public class SolveProblem extends JFrame {
    private JTextField priceTextField = new JTextField(12);
    private String[] texts = { "오만원", "만원", "천원", "500원", "100원", "50원", "10원", "1원" };
    private int[] money = { 50000, 10000, 1000, 500, 100, 50, 10, 1 };
    private JTextField[] outputs = new JTextField[8];

    public SolveProblem() {
        setTitle("Money Charger");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container c = getContentPane();
        c.setLayout(null);
        c.setBackground(Color.PINK);

        JLabel priceLabel = new JLabel("금액");
        priceLabel.setSize(65, 50);
        priceLabel.setHorizontalAlignment(SwingConstants.RIGHT);
        c.add(priceLabel);

        priceTextField.setBounds(90, 15, 100, 20);
        c.add(priceTextField);

        JButton btn = new JButton("계산");
        btn.setBounds(200, 15, 70, 20);
        c.add(btn);

        for (int i = 0; i < texts.length; i++) {
            JLabel price = new JLabel(texts[i]);
            price.setHorizontalAlignment(SwingConstants.RIGHT);
            price.setBounds(50, 45 + i * 20, 40, 20);
            c.add(price);

            outputs[i] = new JTextField(25);
            outputs[i].setBounds(110, 45 + i * 20, 70, 20);
            outputs[i].setHorizontalAlignment(SwingConstants.CENTER);
            c.add(outputs[i]);
        }

        btn.addActionListener(new MyActionListener());
        setSize(300, 300);
        setVisible(true);
    }

    class MyActionListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            int total = Integer.valueOf(priceTextField.getText());
            for (int i = 0; i < money.length; i++) {
                outputs[i].setText(Integer.toString(total / money[i]));
                total = total % money[i];
            }
        }
    }

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

 

✏️ 11장 실습문제 - 4번

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 String [] strings = {"오만원","만원","천원","500원","100원","50원","10원","1원"};
    private int [] moneys= {50000,10000,1000,500,100,50,10,1};
    private JTextField [] moneyText = new JTextField[8];
    private JCheckBox [] checkBoxes = new JCheckBox[8];
    private JLabel [] moneyLabel = new JLabel[8];
    private int sum;
    public SolveProblem(){
        setTitle("Money Changer With Checkbox");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container c =getContentPane();
        c.setLayout(new BorderLayout());
        c.setBackground(Color.PINK);

        JPanel paenl1=new JPanel();
        JLabel label = new JLabel("금액");
        JTextField textField = new JTextField(15);
        JButton jButton = new JButton("계산");

        paenl1.add(label);
        paenl1.add(textField);
        paenl1.add(jButton);
        paenl1.setBackground(Color.PINK);
        c.add(paenl1,BorderLayout.NORTH);

        jButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                Integer money = Integer.parseInt(textField.getText());
                for(int i=0;i<7;i++){
                    if(checkBoxes[i].isSelected()){
                        Integer q = money/moneys[i];
                        moneyText[i].setText(Integer.toString(q));
                        money %= moneys[i];
                    }
                    else{
                        moneyText[i].setText("0");
                    }
                }
                moneyText[7].setText(Integer.toString(money));

            }
        });



        // 중앙 부분 추가하기
        JPanel panel2 = new JPanel();
        panel2.setBackground(Color.PINK);
        panel2.setLayout(new GridLayout(8,3));
        for(int i=0;i<strings.length;i++){
            moneyLabel[i] = new JLabel(strings[i]);
            moneyText[i] = new JTextField();
            panel2.add(moneyLabel[i]);
            panel2.add(moneyText[i]);

            if(i<7){
                checkBoxes[i] = new JCheckBox();
                checkBoxes[i].setBackground(Color.PINK);
                panel2.add(checkBoxes[i]);
            }
        }
        c.add(panel2,BorderLayout.CENTER);

        JPanel west=new JPanel();
        west.setBackground(Color.pink);
        c.add(west,BorderLayout.WEST);

        JPanel east=new JPanel();
        east.setBackground(Color.pink);
        c.add(west,BorderLayout.EAST);

        JPanel south=new JPanel();
        south.setBackground(Color.pink);
        c.add(west,BorderLayout.SOUTH);

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

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

 

✏️ 11장 실습문제 - 5번

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

public class SolveProblem extends JFrame {

    private JLabel label;
    public SolveProblem() {
        setTitle("JSlider Practice Frame");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container c = getContentPane();
        c.setLayout(new FlowLayout());

        JSlider slider = new JSlider(100,200,130);
        slider.setPaintTrack(true);
        slider.setPaintLabels(true);
        slider.setMajorTickSpacing(20);
        slider.setOrientation(JSlider.HORIZONTAL);
        c.add(slider);

        label = new JLabel(Integer.toString(slider.getValue()));
        label.setOpaque(true);
        label.setBackground(Color.GREEN);
        c.add(label);

        slider.addChangeListener(new ChangeListener() {
            @Override
            public void stateChanged(ChangeEvent e) {
                label.setText(Integer.toString(slider.getValue()));
            }
        });

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

    }

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

 

✏️ 11장 실습문제 - 6번

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

public class SolveProblem extends JFrame {

    private JTextArea textArea;
    private JSlider slider;
    public SolveProblem() {
        setTitle("TextArea Practice Frame");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container c = getContentPane();
        c.setLayout(new FlowLayout());

        textArea = new JTextArea(4,24);
        c.add(textArea);

        slider = new JSlider(JSlider.HORIZONTAL,0,100,0);
        slider.setMinorTickSpacing(5);
        slider.setMajorTickSpacing(20);
        slider.setPaintTicks(true);
        slider.setPaintTrack(true);
        slider.setPaintLabels(true);
        c.add(slider);

        textArea.addKeyListener(new KeyAdapter() {
            @Override
            public void keyTyped(KeyEvent e) {
                JTextArea text = (JTextArea)e.getSource();
                String s = text.getText();
                if(s.length()<=100){
                    int len = s.length();
                    slider.setValue(len);
                }
                else{
                    s = s.substring(0,99);
                    text.setText(s);
                }
            }
        });

        slider.addChangeListener(new ChangeListener() {
            @Override
            public void stateChanged(ChangeEvent e) {
                JSlider jSlider = (JSlider)e.getSource();
                String currentString = textArea.getText();
                int len1 = currentString.length();
                int len2 = jSlider.getValue();
                if(len1>=len2){
                    currentString = currentString.substring(0,len2);
                    textArea.setText(currentString);
                }
                else{
                    jSlider.setValue(len1);
                }
            }
        });

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

    }

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

 

✏️ 11장 실습문제 - 7번

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

public class SolveProblem extends JFrame {
    public SolveProblem() {
        setTitle("JSlider Practice Frame");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container c = getContentPane();
        c.setLayout(new BorderLayout());

        JSlider slider = new JSlider(JSlider.HORIZONTAL,1,100,50);
        slider.setPaintLabels(true);
        slider.setMajorTickSpacing(20);
        slider.setMinorTickSpacing(5);
        slider.setPaintTrack(true);
        slider.setPaintTicks(true);
        c.add(slider,BorderLayout.NORTH);

        JLabel label = new JLabel("I Love Java");
        label.setFont(new Font("Arial",Font.ITALIC,slider.getValue()));
        label.setHorizontalAlignment(SwingConstants.CENTER);
        c.add(label,BorderLayout.CENTER);

        slider.addChangeListener(new ChangeListener() {
            @Override
            public void stateChanged(ChangeEvent e) {
                JSlider slider1 = (JSlider)e.getSource();
                int size = slider1.getValue();
                label.setFont(new Font("Arial",Font.ITALIC,size));
            }
        });

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

    }

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

 

✏️ 11장 실습문제 - 8번

package ex;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.File;
import java.util.Vector;

public class Exercise extends JFrame {
	private JRadioButton left = new JRadioButton("left");
	private JRadioButton right = new JRadioButton("right");
	private JLabel imageLabel;
	private Vector<ImageIcon> imagesVector = new Vector<ImageIcon>();

	public Exercise() {
		setTitle("Image Gallery Practice Frame");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container c = getContentPane();
		c.setLayout(new BorderLayout());

		File fp = new File("images");	//images 폴더를 가리키는 파일 포인터 fp
		File[] imageFiles = fp.listFiles();	//지정한 폴더에 있는 파일들을 File 배열에 저장
		for (File f : imageFiles) {
			if (f.isFile()) {
				ImageIcon icon = new ImageIcon(f.getPath()); //getPath는 파일 경로를 리턴
				imagesVector.add(icon);	//벡터에 이미지를 추가한다
			}
		}

		c.add(new MenuPanel(), BorderLayout.NORTH);
		imageLabel=new JLabel(imagesVector.get(0));	//초기에는 인덱스 0의 이미지를 보이도록
		c.add(imageLabel, BorderLayout.CENTER);
		imageLabel.addMouseListener(new MyMouseListener(0)); //이미지 레이블에 Mouse 리스너 추가

		setSize(500, 300);
		setVisible(true);
	}

	class MenuPanel extends JPanel {
		public MenuPanel() {
			setLayout(new FlowLayout());

			ButtonGroup g = new ButtonGroup();
			g.add(left);
			g.add(right);	//버튼 그룹에 라디오 버튼 추가

			add(left);
			add(right);
			
			left.setSelected(true);	//기본으로 left 버튼을 선택 상태로 함
		}
	}

	class MyMouseListener extends MouseAdapter {
		private int index;

		public MyMouseListener(int startIndex) {
			index = startIndex;
			//마우스 리스너 객체가 처음 생성될 때 지정한 시작 인덱스의 이미지를 초기 화면에 보인다
		}

		public void mouseReleased(MouseEvent e) {	//버튼을 눌렀다 뗐을 때
			if (left.isSelected()) {	//왼쪽 버튼이 선택된 상태이면
				index++;	//인덱스 증가
				if (index >= imagesVector.size())
					index = 0;
				//벡터 크기보다 크면 인덱스를 0으로 변경
			} else {	//오른쪽 버튼이 선택된 상태이면
				index--;	//인덱스 감소
				if (index == -1)
					index = imagesVector.size() - 1;
				//인덱스가 -1이 되면 인덱스 값을 최대로 변경
			}
			imageLabel.setIcon(imagesVector.get(index));
			//변경된 인덱스의 이미지를 이미지 라벨에 보이도록 설정
		}
	}

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

 

✏️ 11장 실습문제 - 9번

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[] imageIcons = { new ImageIcon("images/가위.jpg"),new ImageIcon("images/바위.jpg"),new ImageIcon("images/보.jpg")};
    private JButton [] buttons = new JButton[3];
    private JLabel me=new JLabel("me");
    private JLabel com=new JLabel("com");
    private JLabel result=new JLabel();
    public SolveProblem() {
        setTitle("가위 바위 보 게임");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container c = getContentPane();
        c.setLayout(new BorderLayout());

        JPanel jPanel = new JPanel();
        jPanel.setLayout(new FlowLayout());
        jPanel.setBackground(Color.GRAY);

        JPanel jPanel1 = new JPanel();
        jPanel1.setLayout(new FlowLayout());
        jPanel1.add(me);
        jPanel1.add(com);
        jPanel1.add(result);
        jPanel1.setBackground(Color.YELLOW);

        c.add(jPanel,BorderLayout.NORTH);
        c.add(jPanel1,BorderLayout.CENTER);

        for(int i=0;i<3;i++){
            buttons[i] = new JButton(imageIcons[i]);
            buttons[i].addActionListener(new MyAction(i));
            jPanel.add(buttons[i]);
        }

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

    class MyAction implements ActionListener{
        private int index;
        public MyAction(int i){
            index=i;
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            int i = (int)(Math.random()*3);
            if(index==i) {
                result.setText("Same !!!");
                result.setForeground(Color.RED);
                me.setIcon(imageIcons[i]);
                com.setIcon(imageIcons[i]);
            }
            else if(index-i==1||index-i==-2){
                result.setText("Me !!!");
                result.setForeground(Color.RED);
                me.setIcon(imageIcons[i]);
                com.setIcon(imageIcons[i]);
            }
            else{
                result.setText("Computer !!!");
                result.setForeground(Color.RED);
                me.setIcon(imageIcons[i]);
                com.setIcon(imageIcons[i]);
            }
        }
    }

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

 

✏️ 11장 실습문제 - 10번

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 JLabel [] jLabel = new JLabel[10];
    private int index = 0;
    public SolveProblem() {
        setTitle("Ten 레이블 클릭");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container c = getContentPane();
        c.setLayout(null);

        for(int i=0;i<10;i++){
            jLabel[i] = new JLabel(Integer.toString(i));
            int x= (int)(Math.random()*300);
            int y= (int)(Math.random()*300);
            jLabel[i].setLocation(x,y);
            jLabel[i].setSize(10,10);
            c.add(jLabel[i]);
        }

        for(int i=0;i<10;i++) {
            jLabel[i].addMouseListener(new MouseAdapter() {
                @Override
                public void mouseClicked(MouseEvent e) {
                    JLabel label = (JLabel) e.getSource();
                    int num = Integer.parseInt(label.getText());

                    if (num == index) {
                        label.setVisible(false);
                        index++;
                    } else
                        return;
                }
            });
        }
        setVisible(true);
        setSize(400,200);
    }

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