Java图形用户界面(GUI)工具包swing来写一个简单的留言板程序（不带数据库）

Java图形用户界面(GUI)工具包swing来写一个简单的留言板程序（不带数据库）

package demo2;
import java.awt.BorderLayout;
import javax.swing.JPanel;
import javax.swing.JFrame;
import java.awt.Rectangle;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import java.awt.Font;
import javax.swing.JTextArea;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.JComboBox;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.util.Date;

public class jiang1 extends JFrame {

 private static final long serialVersionUID = 1L;
 private JPanel jContentPane = null;
 private JLabel jLabel = null;
 private JTextArea jTextArea = null;
 private JScrollPane jScrollPane = null;
 private JLabel jLabel1 = null;
 private JComboBox jComboBox = null;
 private JLabel jLabel2 = null;
 private JTextField jTextField = null;
 private JButton jButton = null;
 private JButton jButton1 = null;
 private JButton jButton2 = null;
 private JButton jButton3 = null;
 /**
  * This is the default constructor
  */
 public jiang1() {
  super();
  initialize();
 }

 /**
  * This method initializes this
  * 
  * @return void
  */
 private void initialize() {
  this.setContentPane(getJContentPane());
  this.setTitle("留言板程序");
  this.setBounds(new Rectangle(0, 0, 640, 680));
  this.setVisible(true);
 }

 /**
  * This method initializes jContentPane
  * 
  * @return javax.swing.JPanel
  */
 private JPanel getJContentPane() {
  if (jContentPane == null) {
   jLabel2 = new JLabel();
   jLabel2.setBounds(new Rectangle(210, 407, 90, 24));
   jLabel2.setFont(new Font("Dialog", Font.BOLD, 14));
   jLabel2.setText("输入留言：");
   jLabel1 = new JLabel();
   jLabel1.setBounds(new Rectangle(40, 407, 90, 24));
   jLabel1.setFont(new Font("Dialog", Font.BOLD, 14));
   jLabel1.setText("选择角色：");
   jLabel = new JLabel();
   jLabel.setBounds(new Rectangle(283, 15, 45, 20));
   jLabel.setHorizontalAlignment(SwingConstants.CENTER);
   jLabel.setFont(new Font("Dialog", Font.BOLD, 14));
   jLabel.setText("留言板");
   jContentPane = new JPanel();
   jContentPane.setLayout(null);
   jContentPane.add(jLabel, null);
   jContentPane.add(getJScrollPane(), null);
   jContentPane.add(jLabel1, null);
   jContentPane.add(getJComboBox(), null);
   jContentPane.add(jLabel2, null);
   jContentPane.add(getJTextField(), null);
   jContentPane.add(getJButton(), null);
   jContentPane.add(getJButton1(), null);
   jContentPane.add(getJButton2(), null);
   jContentPane.add(getJButton3(), null);
  }
  return jContentPane;
 }

 /**
  * This method initializes jTextArea 
  *  
  * @return javax.swing.JTextArea 
  */
 private JTextArea getJTextArea() {
  if (jTextArea == null) {
   jTextArea = new JTextArea();
   jTextArea.setText("留言内容：");
   jTextArea.setEditable(false);
  }
  return jTextArea;
 }

 /**
  * This method initializes jScrollPane 
  *  
  * @return javax.swing.JScrollPane 
  */
 private JScrollPane getJScrollPane() {
  if (jScrollPane == null) {
   jScrollPane = new JScrollPane();
   jScrollPane.setBounds(new Rectangle(22, 49, 534, 347));
   jScrollPane.setViewportView(getJTextArea());
  }
  return jScrollPane;
 }

 /**
  * This method initializes jComboBox 
  *  
  * @return javax.swing.JComboBox 
  */
 private JComboBox getJComboBox() {
  if (jComboBox == null) {
   jComboBox = new JComboBox();
   jComboBox.setBounds(new Rectangle(110, 407, 100, 24));
   String[] mycbox={"管理员","博主","游客"};
   jComboBox.addItem(mycbox[0]);
   jComboBox.addItem(mycbox[1]);
   jComboBox.addItem(mycbox[2]);
  }
  return jComboBox;
 }

 /**
  * This method initializes jTextField 
  *  
  * @return javax.swing.JTextField 
  */
 private JTextField getJTextField() {
  if (jTextField == null) {
   jTextField = new JTextField();
   jTextField.setBounds(new Rectangle(280, 407, 231, 200));
  }
  return jTextField;
 }

 /**
  * This method initializes jButton 
  *  
  * @return javax.swing.JButton 
  */
 private JButton getJButton() {
  if (jButton == null) {
   jButton = new JButton();
   jButton.setBounds(new Rectangle(505, 407, 70, 24));
   jButton.setText("发帖");
   jButton.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent e) {
     Date date = new Date();
     jTextArea.setText(jTextArea.getText()+"\r\n"+date.toString()+ "  " + jComboBox.getSelectedItem().toString()+"   留言："+jTextField.getText());
    }
   });
  }
  return jButton;
 }

 /**
  * This method initializes jButton1 
  *  
  * @return javax.swing.JButton 
  */
 private JButton getJButton1() {
  if (jButton1 == null) {
   jButton1 = new JButton();
   jButton1.setBounds(new Rectangle(565, 51, 60, 32));
   jButton1.setText("删帖");
   jButton1.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent e) {
 //    jTextArea.setText("留言内容：");
     //  if(jComboBox.getSelectedItem().toString() == "管理员" || jComboBox.getSelectedItem().toString() =="博主" )｛

    }
   });
  }
  return jButton1;
 }

 /**
  * This method initializes jButton2 
  *  
  * @return javax.swing.JButton 
  */
 private JButton getJButton2() {
  if (jButton2 == null) {
   jButton2 = new JButton();
   jButton2.setBounds(new Rectangle(560, 112, 80, 32));
   jButton2.setText("从头浏览");
   jButton2.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent e) {
     jTextArea.setCaretPosition(0);
    }
   });
  }
  return jButton2;
 }

 /**
  * This method initializes jButton3 
  *  
  * @return javax.swing.JButton 
  */
 private JButton getJButton3() {
  if (jButton3 == null) {
   jButton3 = new JButton();
   jButton3.setBounds(new Rectangle(560, 173, 80, 32));
   jButton3.setText("从尾浏览");
   jButton3.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent e) {
     jTextArea.setCaretPosition((int)jTextArea.getText().length());
    }
   });
  }
  return jButton3;
 }
 public static void main(String args[]){
  new jiang1();
 }

}