java:IO流(带缓冲的字符流)

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* BufferedReader的read()方法读取字符时会一次读取若干字符到缓冲区, 然后逐个返回给程序, 降低读取文件的次数, 提高效率
* BufferedWriter的write()方法写出字符时会先写到缓冲区, 缓冲区写满时才会写到文件, 降低写文件的次数, 提高效率
* 
		BufferedReader br = new BufferedReader(new FileReader("aaa.txt"));	//创建字符输入流对象,关联aaa.txt
		BufferedWriter bw = new BufferedWriter(new FileWriter("bbb.txt"));	//创建字符输出流对象,关联bbb.txt
		
		int ch;				
		while((ch = br.read()) != -1) {		//read一次,会先将缓冲区读满,从缓冲去中一个一个的返给临时变量ch
			bw.write(ch);					//write一次,是将数据装到字符数组,装满后再一起写出去
		}
		
		br.close();							//关流
		bw.close();