The Developer's Info » Java Basic I/O

Using InputStream in Java

Oleg Mazurashu — Wed, 24 Feb 2010 14:31:01 +0000

InputStream is the abstract super class for all input streams. It declares the three basic methods needed to read bytes of data from a stream. It also has methods for closing streams, checking how many bytes of data are available to be read, skipping over input, marking a position in a stream and resetting back . . . → Read More: Using InputStream in Java No related posts.

Using OutputStream in Java

Oleg Mazurashu — Wed, 24 Feb 2010 13:19:17 +0000

OutputStream class declares basic methods which you need to write bytes of data onto a stream.

Writing bytes to the OutputStream

OutputStream class has write() method which is fundamental:

public abstract void write(int b) throws IOException

This method writes a byte of data whose value should be between 0 and 255. If I pass a . . . → Read More: Using OutputStream in Java No related posts.

Using Scanner for reading data from system console in Java

Oleg Mazurashu — Mon, 22 Feb 2010 19:32:10 +0000

Java has one more way for reading data from system console. Scanner was introduced in Java 1.5. Scanner class allows to read data from system console. Here I want to show example about it. Example reads String and int values and then prints them:

import java.util.Scanner; /** * This class shows how to use Scanner . . . → Read More: Using Scanner for reading data from system console in Java No related posts.

Reading data from console with Console class in Java

Oleg Mazurashu — Mon, 22 Feb 2010 16:24:54 +0000

Java 6 allows to read data from system console with Console class. There are several ways to do it, but I personally like this one. Here I will show example about how to read data with Console class. It is very easy and I will not describe how it works. If you will not understand . . . → Read More: Reading data from console with Console class in Java No related posts.

Redirecting System.out, System.in, System.err in Java

Oleg Mazurashu — Mon, 22 Feb 2010 08:51:47 +0000

Sometimes need to redirect System.out, System.in, System.err. It is very easy. I am going to show here how you can do it. System class has for redirecting several methods:

System.setOut(new PrintStream(new FileOutputStream("outputFile"))); System.setErr(new PrintStream(new FileOutputStream("errorFile"))); System.setIn(new FileInputStream("inputFile"));

Of course I am going to show example of their usage. This is very simple example, but it . . . → Read More: Redirecting System.out, System.in, System.err in Java No related posts.