applet1.java

一个涉及到多进程和Graphics画笔应用的java小程序！

package com;

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class Applet1 extends Applet implements ActionListener
{
	TextField tf,tf1;
	TextArea ta;
	Button bt;
	
	public Applet1()
	{
//		super("运行程序");
		tf=new TextField("运行程序",15);
		tf1=new TextField("打开文件",45);
		ta=new TextArea(20,60);
		bt=new Button("运行");
	}
	
	public void init()
	{
		setSize(600,400);
		setLocation(40,40);
		setLayout(new FlowLayout());
		
		add(tf);
		add(tf1);
		add(bt);
		add(ta);
		
		bt.addActionListener(this);
		
		setVisible(true);
	}
	
	public void actionPerformed(ActionEvent e) 
	{
		
		/**打开一个新的进程*/ /*
		ta.setText(ta.getText()+"执行actionPerformed(ActionEvent e)方法\n");
		String str,str1;
		str=tf.getText();
		str1=tf1.getText();
		if(str!=null && str1!=null)
		{
			String[] arg={str,str1};
			try
			{
				ta.setText(ta.getText()+str+"打开\n");
				Runtime rt=Runtime.getRuntime();
				ta.setText(ta.getText()+str+"得到Runtime对象\n");
				rt.exec(arg);
				ta.setText(ta.getText()+str+"运行成功\n");
			}
			catch(Exception en)
			{
				ta.setText(ta.getText()+en.toString()+"\n");
			}
		}			
		*/
			
		Graphics g=ta.getGraphics();
		g.draw3DRect(20,20,150,40,false);
		g.setColor(Color.RED);
		g.setFont(new Font(null,Font.BOLD,20));
		g.drawString("hello world !",30,50);
		ta.print(g);

	}	
}