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构造函数中缓冲区大小的含义是什么？

BufferedReader(Reader in, int size)

正如我写的程序:

import java.io.*;
class bufferedReaderEx{
    public static void main(String args[]){
        InputStreamReader isr = null;
        BufferedReader br = null;
            try{
                isr = new InputStreamReader(System.in);
//              System.out.println("Write data: ");
//              int i = isr.read();
//              System.out.println("Data read is: " + i);
                //Thus the InputStreamReader is useful for reading the character from the stream
                System.out.println("Enter the data to be read by the bufferedReader: ");
                //here isr is containing the lnefeed already so this is needed to be flushed. …