java中講講BufferedReader的用法

 BufferedReader的用法
馬克-to-win：BufferedReader和BufferedInputStream差不多，只不過一個處理字符，一個處理字節(jié)。buffer（緩存）什么的原理都是一樣的。馬克- to-win：馬克 java社區(qū)：防盜版實名手機尾號： 73203。



例：2.3.1
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();
    }
}

結(jié)果：
qi hello bye97我們
z
97
3.14




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 = "你們" + "\n" + "他們我們" + "\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);
        }
    }
}

結(jié)果：

output你們
output他們我們