버튼을 등록하고 버튼을 누를때마다 이미지를 바꾸게 하자
package _1124_A; import javax.swing.*; import javax.swing.border.EmptyBorder; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public class main extends JFrame { private JLabel mImageLabel; private ImageIcon[] mImages; private int mImageIndex; public static void main(String[] args) { main frame = new main(); frame.setVisible(true); } public main() { this.setSize(500, 300); this.setTitle("GUI Test"); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setLayout(new BorderLayout()); JPanel bottom = new JPanel(); mImageLabel = new JLabel(); mImageLabel.setHorizontalAlignment(JLabel.CENTER); mImages = new ImageIcon[4]; for (int i = 0; i < 4; ++i) { mImages[i] = new ImageIcon("./Assets/image" + (i+1) + ".png"); } mImageIndex = 0; mImageLabel.setIcon(mImages[mImageIndex]); JButton btnL = new JButton(new ImageIcon("./Assets/button_Left.png")); JButton btnR = new JButton(new ImageIcon("./Assets/button_Right.png")); bottom.add(btnL); bottom.add(btnR); btnL.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { RefreshImageIndex(false); mImageLabel.setIcon(mImages[mImageIndex]); } }); btnR.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { RefreshImageIndex(true); mImageLabel.setIcon(mImages[mImageIndex]); } }); this.add(mImageLabel, BorderLayout.CENTER); this.add(bottom, BorderLayout.SOUTH); this.setVisible(true); } private void RefreshImageIndex(boolean isForward) { mImageIndex += isForward ? +1 : -1; if(mImageIndex == 4) mImageIndex = 0; if(mImageIndex == -1) mImageIndex = 3; } }
여러가지 기능을 섞은 마지막 문제
package _1124_B; import javax.swing.*; import javax.swing.border.EmptyBorder; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; public class main extends JFrame { JTextField tf = new JTextField(20); JTextField nameTf = new JTextField(20); JTextArea ta; JRadioButton[] radio = new JRadioButton[3]; int id = 20190001; String[] text = { "==선택==", "교수", "직원", "학생" }; String type; String name; JPanel lowerP; private JTextArea mTextArea; JComboBox nameCombo; main() { setTitle("사용자 등록 예제"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setSize(500, 300); setVisible(true); JPanel contentP = new JPanel(); contentP.setLayout(new GridLayout(2, 1)); JPanel upperP = new JPanel(); upperP.setLayout(new GridLayout(1, 2)); JPanel leftP = new JPanel(); leftP.setLayout(new GridLayout(3, 1)); leftP.add(new JLabel("학번")); leftP.add(new JLabel("타입")); leftP.add(new JLabel("이름")); upperP.add(leftP); JPanel rightP = new JPanel(); rightP.setLayout(new GridLayout(3, 1)); tf.setEditable(false); tf.setText(Integer.toString(id)); rightP.add(tf); nameCombo = new JComboBox(); for (int i = 0; i < text.length; i++) nameCombo.addItem(text[i]); rightP.add(nameCombo); rightP.add(nameTf); upperP.add(rightP); contentP.add(upperP); lowerP = new JPanel(); lowerP.setLayout(new GridLayout(2, 1)); //버튼 JButton addB = new JButton(new ImageIcon("./Assets/button.png")); addB.addActionListener(new MyActionListener()); lowerP.add(addB); mTextArea = new JTextArea(); lowerP.add(new JScrollPane( mTextArea)); contentP.add(lowerP, BorderLayout.SOUTH); lowerP.setBounds(0, 0, 500, 100); lowerP.setSize(500, 200); add(contentP); setSize(500, 300); setVisible(true); } public static void main(String[] args) { new main(); } private class MyActionListener implements ActionListener { public void actionPerformed(ActionEvent e) { if(nameCombo.getSelectedIndex() == 0) { JOptionPane.showMessageDialog(null, "콤보박스를 선택하세요", "ERROR", JOptionPane.ERROR_MESSAGE); return; } else if(nameTf.getText().length() == 0) { JOptionPane.showMessageDialog(null, "이름을 입력하세요", "ERROR", JOptionPane.ERROR_MESSAGE); return; } PrintScreen(); ResetInputField(); } } private void ResetInputField() { nameTf.setText(""); nameCombo.setSelectedIndex(0); } private void PrintScreen() { mTextArea.setText(mTextArea.getText() + "\n" + "id: " + tf.getText() + ", type: " + nameCombo.getItemAt(nameCombo.getSelectedIndex()) + ", name: " + nameTf.getText()); // ta = new JTextArea("id: " + id + ", type: " + type + ", name" + name, 5, 30); String beforeText = tf.getText(); int refreshNum = Integer.parseInt(beforeText); ++refreshNum; tf.setText(Integer.toString(refreshNum)); } }
