menu1.java

java applet 程序

package test;
import java.awt.*;
import java.awt.color.*;
import java.awt.event.*;
import java.awt.datatransfer.*;

public class menu1 extends Frame implements ActionListener,ItemListener 
{
    MenuBar mnub;
    Menu mnu1,mnu2,mnu3,mnu31;
    MenuItem itm1,itm2,itm3,itm31,itm4,itm5,itm6,itm71,itm72;
    CheckboxMenuItem itm8;
    MenuShortcut stcte=new MenuShortcut(KeyEvent.VK_E);
    MenuShortcut stctn=new MenuShortcut(KeyEvent.VK_N);
    Clipboard clp=null;
    TextArea txt1,txt2;
    menu1()
    {
    	super("一个简单菜单");
    	setVisible(true);
        setBackground(Color.cyan);
        setResizable(true);
        setLayout(new FlowLayout());
        setBounds(10,10,100,60);
        txt1=new TextArea(12,30);
        txt2=new TextArea(12,30);
        mnub=new MenuBar();
        setMenuBar(mnub);
        mnu1=new Menu("文件");
        mnu2=new Menu("编辑");
        mnu3=new Menu("插入");
        mnu31=new Menu("文本框");
        itm1=new MenuItem("新文件",stctn);
        itm2=new MenuItem("打开",new MenuShortcut(KeyEvent.VK_0));
        itm3=new MenuItem("退出");
        itm3.setShortcut(stcte);
        itm4=new MenuItem("复制");
        itm5=new MenuItem("剪切");
        itm6=new MenuItem("粘贴");
        itm71=new MenuItem("横排");
        itm72=new MenuItem("竖排");
        itm8=new CheckboxMenuItem("图片");
        mnub.add(mnu1);
        mnub.add(mnu2);
        mnub.add(mnu3);
        mnu3.add(mnu31);
        mnu1.add(itm1);
        mnu1.addSeparator();
        mnu1.add(itm2);
        mnu1.addSeparator();
        mnu1.add(itm3);
        mnu2.add(itm4);
        mnu2.addSeparator();
        mnu2.add(itm5);
        mnu2.addSeparator();
        mnu2.add(itm6);
        mnu31.add(itm71);
        mnu31.addSeparator();
        mnu31.add(itm72);
        mnu3.addSeparator();
        mnu3.add(itm8);
        add(txt1);
        add(txt2);
        pack();
        clp=getToolkit().getSystemClipboard();
        itm1.addActionListener(this);
        itm2.addActionListener(this);
        itm3.addActionListener(this);
        itm4.addActionListener(this);
        itm5.addActionListener(this);
        itm6.addActionListener(this);
        itm71.addActionListener(this);
        itm72.addActionListener(this);
        itm8.addItemListener(this);
        addWindowListener(new cls());
 }
    
    class cls extends WindowAdapter
    {
    	public void windowClosing(WindowEvent e)
    	{
    		setVisible(false);
    		System.exit(0);
    	}
    }
  
	

	public void actionPerformed(ActionEvent e) 
	{
        if(e.getSource()==itm1)
        {
        	txt1.setText("单击"+itm1.getLabel());
        }
        else  if(e.getSource()==itm2)
        {
        	txt1.setText("单击"+itm2.getLabel());
        }
        else  if(e.getSource()==itm3)
        {
           setVisible(false);
           System.exit(0);
        }
        else  if(e.getSource()==itm4)
        {
        	String str=txt1.getSelectedText();//将ｔｘｔ１文本框中选取的字符串存放在字符串变量ｓｔｒ中
        	StringSelection txt=new StringSelection(str);//StringSelection是java.awt.datatransfer.*包中的一个类;
        	                                            //它具有传递字符串的功能
        	clp.setContents(txt,null);//调用setContents(txt,null)方法将ｔｘｔ中的字符串存放到剪贴板ｃｌｐ中
        }
        else  if(e.getSource()==itm5)
        {
        	String str=txt1.getSelectedText();
        	StringSelection txt=new StringSelection(str);
        	clp.setContents(txt,null);
        	int start=txt1.getSelectionStart();
        	int end =txt1.getSelectionEnd();
        	txt1.replaceRange("", start, end);
        }
        else if(e.getSource()==itm6)
        {
        	Transferable cnt=clp.getContents(this);
        	DataFlavor flv=DataFlavor.stringFlavor;
        	if(cnt.isDataFlavorSupported(flv))
        		try
        	{
        			String str;
        			str=(String)cnt.getTransferData(flv);
        			txt2.append(str);
        	}
        	catch(Exception ee)
        	{
        	}
        }
        else if(e.getSource()==itm71)
        {
        	txt1.setText("单击"+itm71.getLabel());
        }
        else if(e.getSource()==itm72)
        {
        	txt1.setText("单击"+itm72.getLabel());
        }
	}

	public void itemStateChanged(ItemEvent arg0) 
	{
           if(itm8.getState()==true)
           {
        	   txt2.setText(itm8.getLabel()+"ｃｈｅｃｋｅｄ");
        
           }
           else if(itm8.getState()==true)
           {
        	   txt2.setText(itm8.getLabel()+"unｃｈｅｃｋｅｄ");
        
           }

	}
	public static void main(String[] args) 
	{
	  menu1 frm=new menu1();
	}

}