FileReader、FileWriter

只能操作普通文本文件

以字符方式读取，写入

写入时write()方法可以直接传字符串　　write(String s)　　write("\n")

 

创建数组时创建char数组，按字符读取

FileReader fileReader = null;
try {
    fileReader = new FileReader("test");
    char[] chars = new char[2];
    int readCount = 0;
    while ((readCount = fileReader.read(chars)) != -1){
        System.out.println(new String(chars, 0, readCount));
    }