SequenceInputStream available() in Java

available(): This method is available in the java.io.SequenceInputStream class of Java.

Syntax:

int java.io.SequenceInputStream.available() throws IOException

This method returns an estimate of the number of bytes that can be read (or skipped over) from the current underlying input stream without blocking the next invocation of a method for the current underlying input stream.

The next invocation might be the same thread or another thread.

Parameters: NA

Returns: an estimate of the number of bytes that can be read (or skipped over) from the current underlying input stream without blocking or 0 if this input stream has been closed by invoking its close() method.

Throws:

1. IOException - if an I/O error occurs.

Approach

Java

import java.io.FileInputStream;
import java.io.IOException;
import java.io.SequenceInputStream;

public class SequenceInputStreamavailable {
    public static void main(String[] args) throws IOException {
        FileInputStream input1 =
                   new FileInputStream("D:\\hello.txt");
        @SuppressWarnings("resource")
        FileInputStream input2 = 
                            new FileInputStream("D:\\hell.txt");
        SequenceInputStream sequenceInputStream = 
                       new SequenceInputStream(input1, input2);

        System.out.println(sequenceInputStream.available());
        sequenceInputStream.close();

    }
}

Output:

0

Some other methods of SequenceInputStream

available(): This method returns an estimate of the number of bytes that can be read (or skipped over) from the current underlying input stream without blocking the next invocation of a method for the current underlying input stream.

close(): This method closes this input stream and releases any system resources associated with the stream.

read(): This method reads the next byte of data from this input stream. 

read(byte[], int, int): This method reads up to len bytes of data from this input stream into an array of bytes.

SequenceInputStream(InputStream, InputStream): This method initializes a newly created SequenceInputStreamby remembering the two arguments, which will be read in order, first s1 and then s2, to provide the bytes to be read from this SequenceInputStream.

SequenceInputStream(Enumeration): This method initializes a newly created SequenceInputStream by remembering the argument, which must be an Enumeration that produces objects whose run-time type is InputStream.