rootapplet.java

Java语言是目前最流行

import java.awt.*;
//此程序为web程序

public class RootApplet extends javax.swing.JApplet
{//init（）和paint（）代替了main（）
	int number;
	public void init()
	{
		number = 225; 	
	}	
	
	public void paint(Graphics aa)
	{
		Graphics2D aa2D = (Graphics2D) aa;
		aa2D.drawString("这个根由 "+ number + "是" + Math.sqrt(number),5,50); 	
	}
}