Character buffer output stream is used BufferedWriter

In order to efficiently read the character stream, but also provides a corresponding character buffer stream.

BufferedReader：字符缓冲输入流
BufferedWriter：字符缓冲输出流

Construction method:

BufferedWriter(Writer out) 

//BufferedWriter(Writer out) 
		//BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream("a.txt")));
		//下面这个更好，简洁
		BufferedWriter bw=new BufferedWriter(new FileWriter("h.txt"));
		
		//写数据
		bw.write("hello");
		bw.write("world");
		bw.write("java");
		bw.flush();
		//关闭资源
		bw.close();