properties的配置添加、删除、修改操作

public void saveProperties()
	{
		try
		{
			Properties properties = new Properties();

			Properties p = new Properties();
			File file = new File("F://test.properties");
			p.load(new FileInputStream(file));
			Set<String> pSet = p.stringPropertyNames();
			Iterator i = pSet.iterator();
			while(i.hasNext())
			{
				String propertiesName = i.next().toString();
				//删除一个当获取的名称hk相同时，就返回到下一步;break;是退出循环
				if("hk".equalsIgnoreCase(propertiesName)) continue;
				properties.setProperty(propertiesName, p.getProperty(propertiesName));
				//修改
				if("japan".equalsIgnoreCase(propertiesName))
				{
					properties.setProperty(propertiesName, "123456789");
				}
			}
			properties.setProperty("usa", "美国");	
			properties.setProperty("hk", "香港");	
			properties.setProperty("japan", "日本");				
			properties.setProperty("china", "中国");	
                                                //添加			
			properties.store(new FileOutputStream(file), properties.toString());
			
		} catch (IOException e)
		{
			e.printStackTrace();
		}
	}