java actionlistenerとは

package swing.sample; import java.awt.BorderLayout; import java.awt.Container; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.JTextField; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; public class SwingAppMain implements ActionListener { private JFrame mainFrame; private Container contentPane; private JTextField textField; private JTextArea textArea; private JScrollPane scrollPane; private JPanel buttonPane; private JButton addButton; private JButton clearButton; // �R���X�g���N�^ public SwingAppMain[]{ mainFrame = new JFrame["�T���v��"]; mainFrame.setDefaultCloseOperation[JFrame.EXIT_ON_CLOSE]; mainFrame.setSize[320, 200]; mainFrame.setLocationRelativeTo[null]; contentPane = mainFrame.getContentPane[]; textField = new JTextField[]; textArea = new JTextArea[]; scrollPane = new JScrollPane[textArea]; addButton = new JButton["�lj�"]; clearButton = new JButton["����"]; // �u�lj��v�{�^���ƃA�N�V�����E���X�i�[�̊֘A�t�� addButton.addActionListener[this]; // �u�����v�{�^���ƃA�N�V�����E���X�i�[�̊֘A�t�� clearButton.addActionListener[this]; buttonPane = new JPanel[]; buttonPane.add[addButton]; buttonPane.add[clearButton]; contentPane.add[textField, BorderLayout.NORTH]; contentPane.add[scrollPane, BorderLayout.CENTER]; contentPane.add[buttonPane, BorderLayout.SOUTH]; mainFrame.setVisible[true]; } // ���p�҂̑���ɉ��������������� public void actionPerformed[ActionEvent event]{ // ���[�U�̑���Ώۂ𔻒f if[event.getSource[] == addButton] { // �e�L�X�g�G���A�֕������lj� textArea.append[textField.getText[] + "\n"]; } if[event.getSource[] == clearButton] { // �e�L�X�g�G���A�̕������S���� textArea.setText[null]; } } // �A�v���P�[�V�����̋N�� public static void main[String[] args] { new SwingAppMain[]; } }

public class SwingAppMain implements ActionListener {

public void actionPerformed[ActionEvent event]{ }

// �u�lj��v�{�^���ƃA�N�V�����E���X�i�[�̊֘A�t�� addButton.addActionListener[this]; // �u�����v�{�^���ƃA�N�V�����E���X�i�[�̊֘A�t�� clearButton.addActionListener[this];

// ���p�҂̑���ɉ��������������� public void actionPerformed[ActionEvent event]{ // ���[�U�[�̑���Ώۂ𔻒f if[event.getSource[] == addButton] { // �e�L�X�g�G���A�֕������lj� textArea.append[textField.getText[] + "\n"]; } if[event.getSource[] == clearButton] { // �e�L�X�g�G���A�̕������S���� textArea.setText[null]; } }