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();}
}