package text6; import java.sql.*; import java.awt.*; import java.awt.event.*; import javax.swing.*; public class domo extends JFrame implements ActionListener{ JPanel jp1=new JPanel(); JPanel jp2=new JPanel(); JLabel lbl_no=new JLabel("学号"); JLabel lbl_name=new JLabel("姓名"); JLabel lbl_birth=new JLabel("生日"); JLabel lbl_sex=new JLabel("性别"); JLabel lbl_study=new JLabel("学情"); JLabel lbl_live=new JLabel("宿舍"); JTextField txt_no=new JTextField(20); JTextField txt_name=new JTextField(20); JTextField txt_birth=new JTextField(20); JTextField txt_sex=new JTextField(20); JTextField txt_study=new JTextField(20); JTextField txt_live=new JTextField(20); JButton btn_add=new JButton("新增"); JButton btn_delete=new JButton("删除"); JButton btn_update=new JButton("更新"); public domo(){ jp1.add(lbl_no); jp1.add(txt_no); jp1.add(lbl_name); jp1.add(txt_name); jp1.add(lbl_birth); jp1.add(txt_birth); jp1.add(lbl_sex); jp1.add(txt_sex); jp1.add(lbl_study); jp1.add(txt_birth); jp1.add(lbl_live); jp1.add(txt_live); add(jp1,BorderLayout.CENTER); jp2.add(btn_add); jp2.add(btn_delete); jp2.add(btn_update); add(jp2,BorderLayout.SOUTH); setBounds(250,250,250,250); setVisible(true); } @Override public void actionPerformed(ActionEvent e) { // TODO 自动生成的方法存根 } public static void main(String args[]) { JFrame.setDefaultLookAndFeelDecorated(true); new domo(); } }改错

在代码中，lbl_study 和 txt_study 的添加顺序有误，应该是先添加标签 lbl_study，再添加文本框 txt_study。在代码中，txt_study 的添加应该替换为 txt_live。因此，正确的代码如下：

package text6; 

import java.sql.*; 
import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 

public class domo extends JFrame implements ActionListener{ 
	JPanel jp1=new JPanel(); 
	JPanel jp2=new JPanel(); 
	JLabel lbl_no=new JLabel("学号"); 
	JLabel lbl_name=new JLabel("姓名"); 
	JLabel lbl_birth=new JLabel("生日"); 
	JLabel lbl_sex=new JLabel("性别"); 
	JLabel lbl_study=new JLabel("学情"); 
	JLabel lbl_live=new JLabel("宿舍"); 
	JTextField txt_no=new JTextField(20); 
	JTextField txt_name=new JTextField(20); 
	JTextField txt_birth=new JTextField(20); 
	JTextField txt_sex=new JTextField(20); 
	JTextField txt_live=new JTextField(20); 
	JTextField txt_study=new JTextField(20); 
	JButton btn_add=new JButton("新增"); 
	JButton btn_delete=new JButton("删除"); 
	JButton btn_update=new JButton("更新"); 

	public domo(){ 
		jp1.add(lbl_no); 
		jp1.add(txt_no); 
		jp1.add(lbl_name); 
		jp1.add(txt_name); 
		jp1.add(lbl_birth); 
		jp1.add(txt_birth); 
		jp1.add(lbl_sex); 
		jp1.add(txt_sex); 
		jp1.add(lbl_study); 
		jp1.add(txt_study); 
		jp1.add(lbl_live); 
		jp1.add(txt_live); 
		add(jp1,BorderLayout.CENTER); 

		jp2.add(btn_add); 
		jp2.add(btn_delete); 
		jp2.add(btn_update); 
		add(jp2,BorderLayout.SOUTH); 

		setBounds(250,250,250,250); 
		setVisible(true); 
	} 

	@Override 
	public void actionPerformed(ActionEvent e) { 
		// TODO 自动生成的方法存根 		
	} 

	public static void main(String args[]) { 
		JFrame.setDefaultLookAndFeelDecorated(true); 
		new domo(); 
	} 
}