InputStream skipNBytes(long) in Java

skipNBytes(long): This method is available in the java.io.InputStream class of Java.

Syntax:

void java.io.InputStream.skipNBytes(long n) throws IOException

This method takes one argument. This method skips over and discards exactly n bytes of data from this input stream.

If n is zero, then no bytes are skipped. If n is negative, then no bytes are skipped.

This method blocks until the requested number of bytes have been skipped, the end of the file is reached, or an exception is thrown.

If the end of the stream is reached before the stream is at the desired position, then an EOFException is thrown.

Parameters: One parameter is required for this method.

n: the number of bytes to be skipped.

Throws:

1. EOFException - if end of the stream is encountered before the stream can be positioned n bytes beyond its position when this method was invoked.

2. IOException - if the stream cannot be positioned properly or if an I/O error occurs.

Approach 1: When no exception

Java

import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

public class InputStreamskipNBytes {
    public static void main(String[] args) throws IOException {
        File file = new File("D:\\hello.txt");
        InputStream inputStream = new FileInputStream(file);

        long n = 100L;

        try {
            inputStream.skipNBytes(n);
            System.out.println("Successfully skipped n bytes");
        } catch (EOFException e) {
            System.out.println("EOFException occurs");
        } catch (IOException e) {
            System.out.println("IOException occurs");
        }

        inputStream.close();
    }
}

Output:

Successfully skipped n bytes

Approach 2: IOException

Java

import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

public class InputStreamskipNBytes {
    public static void main(String[] args) throws IOException {
        File file = new File("D:\\hello.txt");
        InputStream inputStream = new FileInputStream(file);

        long n = 100L;

        inputStream.close();
        try {
            inputStream.skipNBytes(n);
            System.out.println("Successfully skipped n bytes");
        } catch (EOFException e) {
            System.out.println("EOFException occurs");
        } catch (IOException e) {
            System.out.println("IOException occurs");
        }

    }
}

Output:

IOException occurs

Some other methods of InputStream

available(): This method returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking, which may be 0, or 0 when the end of the stream is detected.

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

mark(int):  This method marks the current position in this input stream.

markSupported(): This method tests if this input stream supports the mark and reset methods.

InputStream.nullInputStream(): This method returns a new InputStream that reads no bytes. The returned stream is initially open.

read(): This method reads the next byte of data from the input stream. The value byte is returned as an int in the range 0 to 255.

read(byte[]): This method reads some number of bytes from the input stream and stores them into the buffer array b.

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

readAllBytes(): This method reads all remaining bytes from the input stream.

readNBytes(int): This method reads up to a specified number of bytes from the input stream.

readNBytes(byte[], int, int): This method reads the requested number of bytes from the input stream into the given byte array.

reset(): This method repositions this stream to the position at the time the mark method was last called on this input stream.

skip(long):  This method skips over and discards n bytes of data from this input stream.

transferTo(OutputStream): This method reads all bytes from this input stream and writes the bytes to the given output stream in the order that they are read.