propertiesdemo.java

这是清华大学编写的JAVA教材中所有题目的源代码！

import java.util.*;
import java.io.*;

class PropertiesDemo
{
	public static void main(String[] args)
	{
		Properties settings=new Properties();
		
		try
		{
			settings.load(new FileInputStream("c:\\count.txt"));
		}
		catch(Exception e)
		{
			settings.setProperty("Count",new Integer(0).toString());
		}
		
		int c=Integer.parseInt(settings.getProperty("Count"))+1;
		System.out.println("这是本程序第"+c+"次被使用");
		settings.setProperty("Count",new Integer(c).toString());
		
		try
		{
			settings.store(new FileOutputStream("c:\\count.txt"),"This Program is used:");
		}
		catch(Exception e)
		{
			System.out.println(e.getMessage());
		}
	}
}