readBytesWithLength.java

import java.io.IOException;
import java.util.Arrays;

public class InputStreamExample {

	public static void main(String[] args){
		byte[] bytes = new byte[30];

		try {	
			System.out.println("Available bytes :"+System.in.available());
			System.out.print("Write something :");
			int bytesread = System.in.read(bytes,5,14);

			System.out.println("I've read :"+bytesread +" bytes from the InputStream");
			System.out.println(Arrays.toString(bytes));

		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}	
	}
}