字符流-->字符流的底层其实就是字节流

public class Stream {
    public static void main(String[] args) throws IOException {
        //1.创建对象并关联本地文件
        FileReader fr=new FileReader("abc\\a.txt");
        //2.读取资源read()

        int ch;
        while((ch=fr.read())!=-1){
            System.out.print(ch);
        }
        //3.释放资源
        fr.close();
    }
}

public class Stream {
    public static void main(String[] args) throws IOException {
        //1.创建对象
        FileReader fr=new FileReader("abc\\a.txt");
        //2.读取资源read()
        char [] chars=new char[2];
        int len;
        while((ch=fr.read(chars))!=-1){
            System.out.print(new String(chars,0,len));
        }
        //3.释放资源
        fr.close();
    }
}

FileWriter

public class Stream1 {
    public static void main(String[] args) throws IOException {
        FileWriter fw=new FileWriter("abc\\a.txt");
        char[] chars={'a','b','c','你'};
        fw.write(chars);

        fw.close();
    }
}