java中讲讲BufferedReader的用法，举例？

2.3 BufferedReader的用法

马克-to-win：BufferedReader和BufferedInputStream差不多，只不过一个处理字符，一个处理字节。buffer（缓存）什么的原理都是一样的。

例：2.3.

import java.io.*;

public class TestMark_to_win {

public static void main(String args[]) throws Exception {

/* from file to string then to "multiline string" then to console. */

String s2, s3 = new String();

/*Creates a new FileReader, given the name of the file to read from.BufferedReader(Reader in) Create a buffering character-input stream

that uses a default-sized input buffer.*/

BufferedReader in = new BufferedReader(new FileReader("c:/4.txt"));

/*readLine is a method from BufferedReader: Read a line of text.

Returns: A String containing the contents of the line, not including

any line-termination characters, or null if the end of the stream has

been reached */

while ((s2 = in.readLine()) != null) {

s3 += s2 + "\n";

}

System.out.println(s3);

in.close();

}

}

例：2.3.2

import java.io.*;

public class TestMark_to_win {

public static void main(String args[]) throws Exception {

// /// from StringReader to file:

String s = "你们" + "\n" + "他们我们" + "\n";

String s1 = "";

StringReader in2 = new StringReader(s);

in2.reset();

BufferedReader in4 = new BufferedReader(in2);

while ((s1 = in4.readLine()) != null) {

System.out.println("output" + s1);

}

}

}

更多请见：https://blog.csdn.net/qq_44639795/article/details/102611549