帮我解读一下java代码

每句都解读一下，谢了
package 商品信息管理系统;
import java.awt.event.;
import java.sql.;
import javax.swing.*;
import 商品信息管理系统.Purchase;

class SetGoods extends JFrame implements ActionListener {
JLabel JL = new JLabel("请用以下任意一种方式查询您想要的商品", JLabel.CENTER);
JLabel number = new JLabel("商品编号");
JTextField Number = new JTextField();

JLabel JClass=new JLabel("类别");
String str[]={"无","食品","化妆品","日用品","饮品"};
JComboBox jcb=new JComboBox(str);

JLabel name = new JLabel("商品名称");
JTextField Name = new JTextField();
JLabel price=new JLabel("商品价格");
JTextField Price = new JTextField();
JLabel brand= new JLabel("品牌");
JTextField Brand = new JTextField();
JLabel vender = new JLabel("生产厂家");
JTextField Vender = new JTextField();

JTextField jt=new JTextField(10);
JButton Set = new JButton("查询");
JButton purchase = new JButton("购买");
JButton Reset = new JButton("重置");
JButton Exit = new JButton("退出");
String sql = "";
public SetGoods(){
    this.setTitle("商品管理系统");
    this.setLayout(null);
    JL.setBounds(100, 50,250, 20);
    this.add(JL);
    number.setBounds(100,100,100,20);
    this.add(number);
    Number.setBounds(200,100,100,20);
    this.add(Number);
    JClass.setBounds(100,150,100,20);
    this.add(JClass);
    jcb.setBounds(200,150,100,20);
    this.add(jcb);
    name.setBounds(100,200,100,20);
    this.add(name);
    Name.setBounds(200,200,100,20);
    this.add(Name);
    price.setBounds(100,250,100,20);
    this.add(price);
    Price.setBounds(200,250,100,20);
    this.add(Price);
    brand.setBounds(100,300,100,20);
    this.add(brand);
    Brand.setBounds(200,300,100,20);
    this.add(Brand);
    vender.setBounds(100,350,100,20);     
    this.add(vender);
    Vender.setBounds(200,350,100,20);
    this.add(Vender);
    Set.setBounds(100,400,60,20);
    this.add(Set);
    Set.addActionListener(this);
    purchase .setBounds(160,400,60,20);
    this.add(purchase );     
    purchase .addActionListener(this);
    Reset.setBounds(220,400,60,20);
    this.add(Reset);     
    Reset.addActionListener(this);
    Exit.setBounds(280, 400,60, 20);
    this.add(Exit);
    Exit.addActionListener(this);
    this.setVisible(true);
    this.setBounds(10,10,450,540);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
    new SetGoods();
}
public void actionPerformed(ActionEvent e) {
    if (e.getSource() == Set) {
        Statement stm=null;
        Connection cot;
        try{
            cot=ConnectionFactory.getConnection();
            stm=cot.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE ,ResultSet.CONCUR_UPDATABLE );
            if(Number.getText()!=null)
                sql="select * from goods where number='"+Number.getText()+"'";
            else if(Name.getText()!=null)
                sql="select * from goods where name='"+Name.getText()+"'";
            else if(Price.getText()!=null)
                sql="select * from goods where price='"+Price.getText()+"'";
            else if(Brand.getText()!=null)
                sql="select * from goods where brand='"+Brand.getText()+"'";
            else if(Vender.getText()!=null)
                sql="select * from goods where vender='"+Vender.getText()+"'";
            ResultSet rs=stm.executeQuery(sql);
            while(rs.next()) {
                System.out.println("商品编号 "+Number.getText());
                int s=jcb.getSelectedIndex();
                if(s==0)
                    JOptionPane.showMessageDialog( null, "请选择类别" );
                else if(s==1)
                    System.out.println("商品类别：食品");
                else if(s==2)
                    System.out.println("商品类别：化妆品");
                else if(s==3)
                    System.out.println("商品类别：日用品");
                else if(s==4)
                    System.out.println("商品类别:饮品");
                System.out.println("商品名称: "+rs.getString("name"));
                System.out.println("价格: "+rs.getString("price"));
                System.out.println("库存量: "+rs.getString("storage"));
                System.out.println("品牌: "+rs.getString("brand"));
                System.out.println("生产厂家: "+rs.getString("vender"));
            }
        }catch(Exception ee){
            JOptionPane.showMessageDialog( null, "该商品不存在" );
            ee.printStackTrace();
        }
    }
    else if(e.getSource()==purchase){
        
        new Purchase();
    }
    else if(e.getSource()==Reset){
        Number.setText(null);
        Name.setText(null);
        Vender.setText(null);
        Price.setText(null);
        Brand.setText(null);
    }
    else if(e.getSource()==Exit) {
        this.setVisible(false);
    }
}

}

把别人当奴仆是吧，每一句都解读，那你怎么自己不去学