BufferedInputStream class

                                            
    java.lang.Object                                       
     |                                      
     |--java.io.InputStream                                   
         |                                  
         |--java.io.FilterInputStream                               
             |                              
             |--java.io.BufferedInputStream                           
                                            

A BufferedInputStream adds the ability to buffer the input and to support the mark and reset methods.

When the BufferedInputStream is created, an internal buffer array is created.

ConstructorSummary
BufferedInputStream(InputStream in)Creates a BufferedInputStream and saves its argument, the input stream in, for later use.
BufferedInputStream(InputStream in, int size)Creates a BufferedInputStream with the specified buffer size, and saves its argument, the input stream in, for later use.

ReturnMethodSummary
intavailable()Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream.
voidclose()Closes this input stream and releases any system resources associated with the stream.
voidmark(int readlimit)See the general contract of the mark method of InputStream.
booleanmarkSupported()Tests if this input stream supports the mark and reset methods.
intread()See the general contract of the read method of InputStream.
intread(byte[] b, int off, int len)Reads bytes from this byte-input stream into the specified byte array, starting at the given offset.
voidreset()See the general contract of the reset method of InputStream.
longskip(long n)See the general contract of the skip method of InputStream.
Revised from Open JDK source code

Create BufferedInputStream from FileInputStream


import java.io.BufferedInputStream;
import java.io.FileInputStream;

public class Main {

  public static void main(String args[]) throws Exception {
    FileInputStream fis = new FileInputStream("c:/a.htm");

    BufferedInputStream bis = new BufferedInputStream(fis);

    int i;
    while ((i = bis.read()) != -1) {
      System.out.println(i);
    }

    fis.close();
  }
}

Read byte array out of BufferedInputStream


import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;

public class Main {

  public static void main(String[] args) throws Exception {
    File file = new File("C:/ReadFile.txt");
    FileInputStream fin = new FileInputStream(file);
    BufferedInputStream bin = new BufferedInputStream(fin);

    byte[] contents = new byte[1024];
    int bytesRead = 0;
    String strFileContents;
    while ((bytesRead = bin.read(contents)) != -1) {
      strFileContents = new String(contents, 0, bytesRead);
      System.out.print(strFileContents);
    }
    bin.close();
  }
}
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