問題Exceptioninthread"main"java.lang.NoSuchMethodError:mainPressandkeytocontinue..代碼是importjava.sql.*;publicclassSqlCon{privateConnectionconn=null;publicConnectiongetc...

問題

Exception in thread "main" java.lang.NoSuchMethodError:main Press and key to continue..

代碼是

import java.sql.*;

public class SqlCon {

private Connection conn=null;

public Connection getconnection(){

String sql1="com.microsoft.jdbc.sqlserver.SQLServerDriver";

String sql2="jdbc:microsoft:sqlserver://localhost:1433;databasename=Admin";

try {

Class.forName(sql1);

conn=DriverManager.getConnection(sql2, "sa", "123");

} catch (Exception e)

{

System.out.println("OK");

e.printStackTrace();

}

return conn;

}

}

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.*;

import javax.swing.*;

import java.sql.*;

public class Loginframe extends JFrame implements ActionListener{

JLabel lable1=new JLabel("管理員賬號:");

JLabel lable2=new JLabel("管理員密碼:");

JTextField text1=new JTextField(15);

JTextField text2=new JTextField(15);

JButton bt1=new JButton("登陸");

JButton bt2=new JButton("取消");

public Loginframe() {

this.setTitle("管理員登陸窗體");

this.setBounds(200, 200, 260, 140);

this.setLayout(new GridLayout(3,1));

JPanel jp1=new JPanel();

JPanel jp2=new JPanel();

JPanel jp3=new JPanel();

bt1.addActionListener(this);

bt2.addActionListener(this);

jp1.add(lable1);

jp1.add(text1);

jp2.add(lable2);

jp2.add(text2);

jp3.add(bt1);

jp3.add(bt2);

this.add(jp1);

this.add(jp2);

this.add(jp3);

this.setResizable(false);

this.setVisible(true);

}

public void actionPerformed(ActionEvent ex) {

if(ex.getActionCommand().equals("登陸")) {

String name=text1.getText();

String password=text2.getText();

SqlCon sc = new SqlCon();

Connection conn=sc.getconnection();

PreparedStatement stmt=null;

ResultSet rs=null;

String sql="select * from admin where ADname=? and ADpwd=?";

try {

stmt=conn.prepareStatement(sql);

stmt.setString(1, name);

stmt.setString(2, password);

rs=stmt.executeQuery();

if(rs.next()){ //判斷數據集中是否有數據，有則表明當前輸入的用戶和密碼存在

this.setVisible(false);

new DataFrame();

}

else{

JOptionPane.showMessageDialog(null, "用戶名或密碼錯誤!!");

}

} catch (SQLException e) {

e.printStackTrace();

}

}

if(ex.getSource()==bt2) {

System.exit(0);

}

}

public static void main(String[] args) {

new Loginframe();

}

}

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