第十四周课程总结&实验报告（简单记事本的实现）

package Demo;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;

public class test1 implements ActionListener {
      ImageIcon newIcon,openIcon,saveIcon,closeIcon;
      JMenuItem newItem,openItem,saveItem,closeItem;
      JTextArea text;
      File file;
      
      public test1() {
          JFrame frame=new JFrame("TSL");
          JMenuBar bar=new JMenuBar();
          JMenu Menufile=new JMenu("文件");
          JMenu Menuedit=new JMenu("编辑");
          text=new JTextArea();
          text.setEditable(true);
          frame.getContentPane().add(new JScrollPane(text));
          
          newItem=new JMenuItem("新建",new ImageIcon("D:"+File.separator+"tang"+File.separator+"icons"+File.separator+"new.jpg"));
            openItem=new JMenuItem("打开",new ImageIcon("D:"+File.separator+"tang"+File.separator+"icons"+File.separator+"open.jpg"));
            closeItem=new JMenuItem("关闭",new ImageIcon("D:"+File.separator+"tang"+File.separator+"icons"+File.separator+"close.jpg"));
            saveItem=new JMenuItem("保存",new ImageIcon("D:"+File.separator+"tang"+File.separator+"icons"+File.separator+"save.jpg"));
          
            newItem.setMnemonic(‘N‘);
          openItem.setMnemonic(‘O‘);
          closeItem.setMnemonic(‘C‘);
          saveItem.setMnemonic(‘S‘);
        
          newItem.setAccelerator(KeyStroke.getKeyStroke(‘N‘,java.awt.Event.CTRL_MASK));
          openItem.setAccelerator(KeyStroke.getKeyStroke(‘O‘,java.awt.Event.CTRL_MASK));
          closeItem.setAccelerator(KeyStroke.getKeyStroke(‘C‘,java.awt.Event.ALT_MASK));
          saveItem.setAccelerator(KeyStroke.getKeyStroke(‘E‘,java.awt.Event.ALT_MASK));
          
          newItem.addActionListener(this);
          openItem.addActionListener(this);
          saveItem.addActionListener(this);
          closeItem.addActionListener(this);
          
          bar.add(Menufile);
          bar.add(Menuedit);
          Menufile.add(newItem);
          Menufile.add(openItem);
          Menufile.add(saveItem);
          Menufile.add(closeItem);        

          frame.setJMenuBar(bar);
          frame.setVisible(true);
          frame.setSize(600,500);
          frame.setLocation(300,200);
      }

      public void actionPerformed(ActionEvent event) {
          Object obj=event.getSource();
          if(obj instanceof JMenuItem) {
              JMenuItem item=(JMenuItem)obj;
              if(item==newItem) {
                  new test1();
              }else if(item==openItem) {
                  JFileChooser chooser = new JFileChooser();
                  chooser.showOpenDialog(null);
                  file=chooser.getSelectedFile();
                  try {
                      FileInputStream fis = new FileInputStream(file);
                      byte[] b=new byte[fis.available()];
                      fis.read(b);
                      text.append(new String(b));
                      fis.close();
                  }catch(FileNotFoundException e) {
                      e.printStackTrace();
                  } catch (IOException e) {               
                      e.printStackTrace();
                  }
              }else if(item==saveItem) {
                  JFileChooser chooser = new JFileChooser();
                  chooser.showSaveDialog(null);
                  file=chooser.getSelectedFile();
                  if(!file.exists()) {
                      try {
                          file.createNewFile();
                      }catch (IOException e) {
                          e.printStackTrace();
                      }
                  }
              }else if(item==closeItem) {
                  System.exit(0);
              }
          }
          
      }
  }

package Demo;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;

public class test2 {
    public static void main(String[] args) {
        new test1();
    }
}

insert into 表名称[(字段1，字段2，....字段n)]values(值1，值2.....值n)；

delete 表名称[删除条件];

update 表名称 set 字段1=值1......字段n=值1[where 更新条件];

select{*|column alias}
from 表名称 别名
[where condition(s)];        //设置查询条件