java小程序2

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import javax.swing.*;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;public class NULLLayoutDemo extends JFrame implements ActionListener { private JLabel lbUser = new JLabel(); private JLabel info = new JLabel(); private JLabel lbPassword = new JLabel(); private JButton btnLog = new JButton();/* 该行有错误什么问题呀 */ private Container container = getContentPane(); private JTextField jtextfield_1 = new JTextField(10); private JPasswordField jtextfield_2 = new JPasswordField(10); public NULLLayoutDemo() {  super("登陆器");  this.setSize(350, 200);  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public static void main(String[] args) {  NULLLayoutDemo frame = new NULLLayoutDemo();  frame.setLayout();  frame.setVisible(true); } public void setLayout() {  container.setLayout(null);  lbUser.setText("用户名");  container.add(lbUser);  container.add(jtextfield_1); // 增加输入用户名的文本框  jtextfield_1.setBounds(80, 26, 120, 26);// 设置用户名的文本框位置  lbUser.setBounds(16, 26, 42, 16);  lbPassword.setText("密码");  container.add(lbPassword);  lbPassword.setBounds(16, 56, 40, 16);  btnLog.setText("登陆");  jtextfield_2.setEchoChar('*');  container.add(jtextfield_2);// 设置密码的文本框位置  jtextfield_2.setBounds(80, 56, 120, 26);// 增加输入密码的文本框  container.add(btnLog);  btnLog.addActionListener(this);  btnLog.setBounds(125, 101, 73, 25);//  info.setBounds(0, 130, 300, 35); // 设置信息的标签  info.setText("用户名是：我爱你 密码是：520");  container.add(info);  /*   * public void ceshi(){ if() }   */ } public void actionPerformed(ActionEvent e) {  String name = jtextfield_1.getText(); // 取得用户名文本框的信息  String password = jtextfield_2.getText();// 取得密码文本框的信息  // 判断是否符合条件  if ("我爱你".equals(name) && "520".equals(password)) {   JOptionPane.showMessageDialog(this, "恭喜你!爱情登陆成功", "通过",     JOptionPane.INFORMATION_MESSAGE, null);  } else {   JOptionPane.showMessageDialog(this, "你的输入错误", "错误",     JOptionPane.INFORMATION_MESSAGE, null);  } }}
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