一个用Java编写的简单的单机留言板

import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Chat { public static void main(String[] args) { MyFrame aFrame = new MyFrame(); aFrame.setLayout( null ); aFrame.setBounds(100,100,485,600); aFrame.setResizable(false); aFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); aFrame.setVisible(true); } } class MyFrame extends JFrame { JTextField nameField = new JTextField(); //输入姓名 JTextArea inputArea = new JTextArea(5,40); //输入留言 JScrollPane inputScrollPane = new JScrollPane(inputArea); final JTextArea chatArea = new JTextArea("留言记录："); JScrollPane chatScrollPane = new JScrollPane(chatArea); JRadioButton redButton = new JRadioButton("RED",false); JRadioButton greenButton = new JRadioButton("GREEN",false); JRadioButton yellowButton = new JRadioButton("YELLOW",true); JButton enterButton = new JButton("发表"); public MyFrame() { chatArea.setEditable(false); chatArea.setLineWrap(true); inputArea.setLineWrap(true); chatArea.setLayout(null); chatArea.setBackground(Color.YELLOW); chatScrollPane.setBounds(0,0,480,400); add(chatScrollPane); setTitle("留言板"); setSize(480,600); JPanel southPanel = new JPanel(); southPanel.setLayout( null ); southPanel.setBounds(0,400,500,130); JLabel nameLabel = new JLabel("访客姓名"); nameLabel.setBounds(20,0,80,20); southPanel.add(nameLabel); nameField.setBounds(100,0,380,20); southPanel.add(nameField); JLabel inputLabel = new JLabel("访客留言"); inputLabel.setBounds(20,50,80,20); southPanel.add(inputLabel); inputScrollPane.setBounds(100,25,380,100); southPanel.add(inputScrollPane); add(southPanel); enterButton.setLayout(null); enterButton.setBounds(300,530,175,25); add(enterButton); ActionListener listener = new MyListener(); enterButton.addActionListener(listener); ButtonGroup colorGroup = new ButtonGroup(); colorGroup.add(redButton); colorGroup.add(greenButton); colorGroup.add(yellowButton); redButton.setLayout(null); greenButton.setLayout(null); yellowButton.setLayout(null); redButton.setBounds(20,530,80,25); greenButton.setBounds(110,530,80,25); yellowButton.setBounds(200,530,80,25); add(redButton); add(greenButton); add(yellowButton); redButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent re) { chatArea.setBackground(Color.RED); } }); greenButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ge) { chatArea.setBackground(Color.GREEN); } }); yellowButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ye) { chatArea.setBackground(Color.YELLOW); } }); } private class MyListener implements ActionListener { public void actionPerformed(ActionEvent e) { String strA = nameField.getText(); String strB = inputArea.getText(); chatArea.append('\n' + "&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&" + '\n' + strA +" : " + '\n' + strB); nameField.setText(""); inputArea.setText(""); } } }