menu1.java

这是一些JAVA的例子,很经典,值得一看.建议初学者来

import java.awt.*;
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,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_O));
		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();
			StringSelection txt=new StringSelection(str);
			clp.setContents(txt,null);
		}
		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 e)
	{
		if(itm8.getState()==true)
		{
			txt2.setText(itm8.getLabel()+" checked ");
		}
		else 
		{
			txt2.setText(itm8.getLabel()+" unchecked");
		}
	}
	
	public static void main(String args[])
	{
		menu1 frm=new menu1();
	}
}