Question

当我点击登陆按钮的时候，就会跳转到聊天界面。但是我的java程序还是没有办法实现这个功能，帮我改一下

package sql;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;

import javax.swing.*;
class liaotian extends JFrame implements ActionListener{
JPanel jpanel1;
TextArea textArea1;
TextField textField3;
JButton jButton1;
liaotian(){
this.setTitle("对话");
this.setSize(600,600);
this.setVisible(true);
jpanel1=new JPanel();
textArea1=new TextArea(15,15);
jButton1=new JButton("发送");
textField3=new TextField(10);
jpanel1.add(textArea1);
jpanel1.add(jButton1);jpanel1.add(textField3);
}
public void actionPerformed(ActionEvent e) {
if(e.getSource()==jButton1){
textArea1.setText(textField3.getText());
textField3.setText("");
}}}
public class lianxi2 extends JFrame implements ActionListener{
JPanel jpanel;
Label label1;
TextField textField1;
Label label2;
TextField textField2;
JButton jButton;
static String col11,col12;
public lianxi2(){
super("登陆");
jpanel=new JPanel();
this.setVisible(true);
this.setSize(600,600);
label1=new Label("账号");
textField1=new TextField(15);
label2=new Label("密码");
textField2=new TextField(15);
jButton=new JButton("登陆");
jpanel.add(label1); jpanel.add(textField1);
jpanel.add(label2); jpanel.add(textField2);
jpanel.add(jButton);
this.add(jpanel);

}
public static void main(String[] args) {
lianxi2 lt = new lianxi2();
try{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");//加载数据库驱动
Connection conn=DriverManager.getConnection("jdbc:sqlserver://localhost:1433;Database=denglu","sa","123456");//链接数据库
Statement statement=conn.createStatement();

ResultSet rs = statement.executeQuery("select * from denglu ");
while(rs.next()){
col11= rs.getString("zhanghao");
col12 = rs.getString("mima");
}
conn.close();
}
catch(Exception e){
e.printStackTrace();
}
}
public void actionPerformed(ActionEvent e) {
if(e.getSource()==jButton){
if(textField1.getText()==col11){
if(textField2.getText()==col12){
liaotian m=new liaotian();
m.setVisible(true);
}
}
}

}}

Answer 1

 public Testc(){
	 super("登陆");
		jpanel=new JPanel();
		this.setVisible(true);
		this.setSize(600,600);
		label1=new Label("账号");
		textField1=new TextField(15);
		label2=new Label("密码");
		textField2=new TextField(15);
		jButton=new JButton("登陆");		
		jpanel.add(label1); jpanel.add(textField1);
		jpanel.add(label2); jpanel.add(textField2);
		jpanel.add(jButton);
		this.add(jpanel);
		jButton.addActionListener(this); //给jbutton加上监听
		
		}

 上面的也要修改一下

liaotian(){
		this.setTitle("对话");
		this.setSize(600,600);
		this.setVisible(true);
		jpanel1=new JPanel();
		textArea1=new TextArea(15,15);
		jButton1=new JButton("发送");
		textField3=new TextField(10);
		jpanel1.add(textArea1);
		jpanel1.add(jButton1);jpanel1.add(textField3);
		this.add(jpanel1);
	}

追问

我运行程序发现当点击登陆按钮的时候，还是没办法跳转到聊天界面。你是运行一下程序

追答

你肯定是用户名密码没有校验成功。。你这么写用户名密码取的是数据库最后一条数据，你用最后一个用户名密码试试

Answer 2

给登录按钮添加事件！当点击的时候先去验证账号密码是否正确 ，如果正确就直接调用聊天窗口的方法进入聊天，否则提示 账号密码错误！
事件自己去百度查询！