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
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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
//创建字符输入流对象,关联aaa.txt BufferedReader br = new BufferedReader(new FileReader("aaa.txt")); //创建字符输出流对象,关联bbb.txt BufferedWriter bw = new BufferedWriter(new FileWriter("bbb.txt")); int ch; //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 while((ch = br.read()) != -1) { //write一次,是将数据装到字符数组,装满后再一起写出去 bw.write(ch); } br.close(); //关流 bw.close();