Detailed explanation of the BufferedReader class in java

BufferedReader class in Java

Construction method:

1: public BufferedReader(Reader in,int sz )

1. Buffer character input stream with specified size input buffer;

2. in a Reader;

3. sz input buffer The size of the area.

2: public BufferedReader(Reader in)

1. Use the buffered character input stream of the default size input buffer.

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Commonly used methods:

public int read() throws IOException

Read a single character as an integer (range 0 to 65535 (0x00-0xffff)). If it reaches the end of the stream, -1 is returned.

public int read(char[] cbuf) throws IOException

Read one byte array cbuf at a time - the number of characters read from the target buffer, if it has been reached At the end of the stream, returns -1

public void close() throws IOException

Closes the stream and releases all resources associated with it.

Special usage:

public String readLine() throws IOException

1. Read a text line

2. One of the following characters can be considered to have terminated a line: line feed ('\n'), carriage return ('\r') or carriage return followed by a line feed.

3. If the end of the stream has been reached, return null

Sample code:

import java.io.BufferedReader;
import java.io.FileReader;

public class class1 {

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

        //创建字符缓冲输入流对象

        BufferedReader br = new BufferedReader(new FileReader("D:/1.txt"));

        //读数据

        //一次读取一个字符数组

        char[] chs = new char[1024] ;

        int len = 0 ;

        while((len=br.read(chs))!=-1) {

            System.out.println(new String(chs,0,len));

        }

        //释放资源

        br.close();

    }

}

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