Code review

1.源代码
package Text1;

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.DefaultComboBoxModel;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.ImageIcon;
import javax.swing.JPasswordField;

public class Day extends JFrame {

    private JPanel contentPane;
    private JTextField textField;
    private JPasswordField passwordField;

    public static void main(String[] args) {
        
                    Day frame = new Day();
                    frame.setVisible(true);
            
    }

    
    public Day() {
        
        setTitle("用户登录");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);
        this.setResizable(false);
        
        JLabel label = new JLabel("用户名");
        label.setBounds(39, 45, 54, 15);
        contentPane.add(label);
        
        JComboBox comboBox = new JComboBox();
        comboBox.setModel(new DefaultComboBoxModel(new String[] {"u7BA1u7406u5458   ", "u6536u94F6u5458"}));
        comboBox.setBounds(126, 121, 173, 21);
        contentPane.add(comboBox);
        
        
        textField = new JTextField();
        textField.setBounds(126, 42, 173, 21);
        contentPane.add(textField);
        textField.setColumns(30);
        
        JButton button = new JButton("确定");
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                
                String userName=textField.getText();
                
                
                String passWord=String.valueOf( passwordField.getPassword());
                
                String role=(String)comboBox.getSelectedItem();
                
                if(userName==null||userName.length()<=0||passWord==null||passWord.length()<=0||role==null||role.length()<=0){
                    JOptionPane.showMessageDialog(contentPane,"请输入完整登录信息！");
                }
                else if(userName.equals("SMMS")&&passWord.equals("123456")&&role.equals("管理员"))
                
                JOptionPane.showMessageDialog(contentPane,"欢迎登录SMMS超市购物系统！");
                
                else
                    JOptionPane.showMessageDialog(contentPane,"输入信息错误，请重新输入！");

                
            }
        });
        button.setBounds(142, 194, 77, 23);
        contentPane.add(button);
        
        JLabel label_1 = new JLabel("密码");
        label_1.setBounds(39, 88, 54, 15);
        contentPane.add(label_1);
        
        JLabel label_2 =        new JLabel("角色");
        label_2.setBounds(39, 124, 54, 15);
        contentPane.add(label_2);
        
        passwordField = new JPasswordField();
        passwordField.setBounds(126, 85, 173, 21);
        contentPane.add(passwordField);
        
        JButton button_1 = new JButton("取消");
        button_1.setBounds(245, 194, 93, 23);
        contentPane.add(button_1);
        
        JLabel label_3 = new JLabel("");
        label_3.setIcon(new ImageIcon("C:\Users\lenovo.Lenovo-PC\Pictures\butterfly.jpg"));
        label_3.setBounds(0, 0, 434, 261);
        contentPane.add(label_3);
    }
}
2.Code review
Number	Problem
1	代码没有注释
2	代码有些杂乱，每段代码之间没有规范，没有让人很清楚该段代码的功能
3	命名不规范，大小写不注意，命名没有意义
4	代码格式布局都不合理
5	整个代码运行后，界面布局不整齐