Java自动生成验证码带图形界面

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本代码只是基本完成要求，不太完善。<br>/*    自动生成验证码Java带图形界面，基本要求完成，还不太完善，请大神完善。    作者：hzl（何泽雷）/带土。  */ import java.util.Random; import java.util.Scanner; import javax.swing.JOptionPane; import java.awt.Color; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextField; import java.awt.event.ActionEvent; //监听键盘与鼠标。 import java.awt.event.ActionListener; public class zdyz implements ActionListener{     static Random s = new Random();     static Scanner sc;     static String b, c;     public static void switch1() {         for (int i = 0; i < 4; i++) {             int x = s.nextInt(1, 4);             switch (x) {                 case 1: {                     int y = s.nextInt(26);                     char a = (char) (y + 65);                     if (b == null)                         b = String.valueOf(a);                     else                         b += a;                     break;                 }                 case 2: {                     int y = s.nextInt(26);                     char a = (char) (y + 97);                     if (b == null)                         b = String.valueOf(a);                     else                         b += a;                     break;                 }                 case 3: {                     int y = s.nextInt(10);                     if (b == null)                         b = String.valueOf(y);                     else                         b += y;                     break;                   }             }         }     }    private JLabel yanz;    private JTextField tyan;    private JButton jb;     public void settu()     {switch1();         JFrame h = new JFrame("自动生成验证码");         h.setSize(400, 300);         h.setLocation(200, 200);         h.setLayout(null);         yanz = new JLabel("验证码：");         tyan = new JTextField("");         yanz.setBounds(20, 110, 300, 30);         tyan.setBounds(60, 110, 120, 30);         jb = new JButton("确定");         jb.setBounds(40, 150, 60, 30);         jb.addActionListener(this);         JButton yz = new JButton(b);         yz.setBounds(200, 110, 100, 30);         yz.setBackground(Color.gray);          yz.addActionListener(this);         h.add(yanz);         h.add(tyan);         h.add(jb);         h.add(yz);         h.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);         h.setVisible(true);     }     public void actionPerformed(ActionEvent e)     {         if(e.getSource()==jb)         {             if(b.equals(tyan.getText())) {JOptionPane.showMessageDialog(null, "登录成功");System.exit(0);         }             else {                  JOptionPane.showMessageDialog(null, "登录失败，请重新输入");b=null;                  settu();               }         }     }     public static void main(String[] args) {         sc = new Scanner(System.in);             zdyz t=new zdyz();             System.out.println("请按下图输入验证码");             t.settu();     } }