총 20개의 과일 사진에서 하나를 누르면 해당하는 과일의 큰 사진이 나오게 하라.

• 메인 창 / 보조창 나누기

✏️ 메인 창

• 20개의 작은 과일들이 4열 5행으로 나눠져있음.
• 마우스를 갖다대면 클릭 손모양 / 초록색 테두리로 바뀜
• 설명말풍선 나타내기

import javax.swing.*;
import javax.swing.border.LineBorder;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

public class FruitView extends JFrame {
    private String[] fruits;
    private JLabel[] labels;
    private JPanel pnl1;

    public FruitView() {
        init();
        setDisplay();
        addListeners();
        showFrime();
    }
    public String[] getFruits() {
        return fruits;
    }
    private void init() {
        fruits = new String[] { "apple", "asparagus", "banana", "broccoli", "cantaloupe", "carrot", "corn", "grapefruit",
                "grapes", "kiwi", "onion", "peach", "pear", "pepper", "pickle", "pineapple", "raspberry", "strawberry",
                "tomato", "watermelon" };
    }
    private void setDisplay() {
        pnl1 = new JPanel(new GridLayout(5, 4));
        labels = new JLabel[fruits.length];

        for (int idx = 0; idx < fruits.length; idx++) {
            ImageIcon icon = new ImageIcon(fruits[idx] + ".jpg");
            labels[idx] = new JLabel(icon);
            labels[idx].setToolTipText("Click the " + fruits[idx]);
            pnl1.add(labels[idx]);
        }

        add(pnl1, BorderLayout.CENTER);

    }
    private void addListeners() {
        MouseListener mouseListener = new MouseAdapter() {

            @Override
            public void mousePressed(MouseEvent e) {
                for(int idx = 0; idx < labels.length; idx++) {
                    if((JLabel) e.getSource() == labels[idx]) {
                        setVisible(false);
                        new Fruit(FruitView.this, idx);
                    }
                }
            }

            @Override
            public void mouseEntered(MouseEvent e) {
                JLabel select = (JLabel)e.getSource();

                for(JLabel lable : labels) {
                    if(select == lable) {
                        lable.setBorder(new LineBorder(Color.GREEN, 2));
                    }
                }
                pnl1.setCursor(new Cursor(Cursor.HAND_CURSOR));
            }

            @Override
            public void mouseExited(MouseEvent e) {
                for(JLabel lable : labels) {
                    lable.setBorder(null);
                }
            }
        };
        for(JLabel lable : labels) {
            lable.addMouseListener(mouseListener);
        }
    }
    public ImageIcon getImage(int idx) {
        Image img = ((ImageIcon)labels[idx].getIcon()).getImage();
        Image newImage = img.getScaledInstance(500, 500, Image.SCALE_SMOOTH);
        return new ImageIcon(newImage);

    }
    private void showFrime() {
        setTitle("Viewer");
        pack();
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);

    }

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

✏️ 보조 창

• 메인 창에서 선택한 과일의 큰 사진 나타내기.
• 오른쪽 클릭 시 다음 과일 사진, 왼쪽을 클릭 시 그 전의 과일 사진 나타내기.
• 마우스 갖다대면 초록 테두리 표시.

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

public class Fruit extends JDialog {

    int currentFruit;
    FruitView owner;
    int maxFruitNum;

    JLabel lblTitle;
    JLabel lblImage;
    JPopupMenu popMenu;
    JMenuItem menuBack;
    JMenuItem menuFront;
    public Fruit(FruitView owner, int idx) {
        super(owner, "Do u see ?", true);
        this.owner = owner;
        currentFruit = idx;
        init();
        setDisplay();
        addListeners();
        showFrame();
    }
    private void init() {
        maxFruitNum = owner.getFruits().length;
        lblTitle = new JLabel((currentFruit + 1) + " / " + maxFruitNum, JLabel.CENTER);
        lblImage = new JLabel(owner.getImage(currentFruit));

        popMenu = new JPopupMenu();
        menuBack = new JMenuItem("뒤로");
        menuFront = new JMenuItem("앞으로");
        popMenu.add(menuBack);
        popMenu.add(menuFront);


    }
    private void setDisplay() {

        add(lblImage, BorderLayout.CENTER);
        add(lblTitle, BorderLayout.NORTH);

    }

    private void addListeners () {
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent we) {
                dispose();
                owner.setVisible(true);
            }
        });

        lblImage.addMouseListener(new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {
                if (e.getButton() == MouseEvent.BUTTON3) {
                    popMenu.show(lblImage, e.getX(), e.getY());
                } else {
                    int half = lblImage.getWidth() / 2;
                    if (e.getX() < half) {
                        back();
                    } else {
                        front();
                    }

                }
            }

            @Override
            public void mouseEntered(MouseEvent e) {
                if(e.getSource() == lblImage) {
                    lblImage.setBorder(new LineBorder(Color.GREEN, 2));
                }

            }

            @Override
            public void mouseExited(MouseEvent e) {
                lblImage.setBorder(null);
            }
        });

        ActionListener actionListener = new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if(e.getSource() == menuFront) {
                    front();
                } else {
                    back();
                }
            }
        };
        menuFront.addActionListener(actionListener);
        menuBack.addActionListener(actionListener);
    }
    private void back() {
        currentFruit --;
        if(currentFruit < 0) {
            currentFruit += maxFruitNum;
        }
        setting();
    }
    private void front() {
        currentFruit++;
        if (currentFruit == maxFruitNum) {
            currentFruit -= maxFruitNum;
        }
        setting();
    }
    private void setting() {
        lblTitle.setText((currentFruit + 1) + " / " + maxFruitNum);
        lblImage.setIcon(owner.getImage(currentFruit));
    }
    private void showFrame () {
        pack();
        setLocationRelativeTo(null);
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        setVisible(true);

    }
}