java简单的页面制作

package 界面;
import java.awt.*;

import javax.swing.JFrame;
import javax.swing.*;
//import javax.swing.table.*;


public class DMGL_Interface extends JFrame{
    
    
    //定义 按钮和标签
        JLabel L_Header,L_Language,L_Type,L_Title;
        JComboBox  Language,Type;
        JTextField Title;
        JTextArea Code;
        JButton Confirm,Cancle;
    
    
    public DMGL_Interface ()
    {
        
        
        
        //布局
        Container contentPane = getContentPane();//定义容器类对象
        setLayout(new FlowLayout());//不设置布局
        setTitle("添加代码");
        //语言框
        JPanel P_Header=new JPanel();
        String [] SLanguage=new String[]{"默认","java","javaScript","c",
                "c++","c#","PHP","Delphi","SAS","PL/SQ","web","ABAP"};
        L_Header =new JLabel("语言");
        Language=new JComboBox(SLanguage);
    
    
        P_Header.add(L_Header);
        P_Header.add(Language);
        
        //类型框
        L_Type =new JLabel("类型");
        String [] SType=new String[]{"默认","函数","知识","模块","程序",};
        Type=new JComboBox(SType);
        
        P_Header.add(L_Type);
        P_Header.add(Type);
        add(P_Header);
        //标题框
        JPanel P_Title=new JPanel();
        L_Title =new JLabel("请输入标题");
        Title =new JTextField("",20);
        P_Title.add(L_Title);
        P_Title.add(Title);
        add(P_Title);
        //文本域
        Code = new JTextArea("",20,32);
        JScrollPane G_Code = new JScrollPane(Code,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); 
        add(G_Code);
        
        
        //按钮
        JPanel P_Button=new JPanel();
        Confirm=new JButton("保存");
        Cancle=new JButton("取消");
        P_Button.add(Confirm);
        P_Button.add(Cancle);
        add(P_Button);
        //设置窗口可见话和大小
        setSize(400,550);
        setVisible(true);
    }
    
    
    
    
    
    
    //主函数
    public static void main(String args[])
{
    new DMGL_Interface();
}

}