Java | The Developer's Info - Part 2

Using Filter Streams in Java

By Oleg Mazurashu,on March 15th,2010%

Filter input streams read data from a preexisting input stream such as a FileInputStream and have an opportunity to work with or change the data before it is delivered to the client program. Filter output streams write data to a preexisting output stream such as a FileOutputStream and have an opportunity to work with or . . . →Read More:Using Filter Streams in Java

Using URLConnection in Java

By Oleg Mazurashu,on March 8th,2010%

URLConnections are closely related to URLs. Indeed,you get a reference to a URLConnection by using the openConnection() method of an URL object. In many ways,the URL class is only a wrapper around the URLConnection class. URLConnections provide more control over the communication between the client and the server. In particular,URLConnections provide not . . . →Read More:Using URLConnection in Java

Using URL in Java

By Oleg Mazurashu,on March 1st,2010%

Here I am going to show example which works with URL. Each URL(Uniform Resource Locator) unambiguously identifies the location of a resource on the Internet. Example shows how to connect to an URL,download its data and show it in console via System.out

import java.io.IOException;import java.io.InputStream;import java.net.MalformedURLException;import java.net.URL;/** * This class . . . →Read More:Using URL in Java

Getting separator symbol in Java

By Oleg Mazurashu,on February 25th,2010%

This snippet of code allows to get symbol which represents separator in your file-system:

System.getProperty(“file.separator”);

Writing files in Java

By Oleg Mazurashu,on February 25th,2010%

I am going to show example which shows how to write a file in Java. If you want to write some file you should start with FileOutputStream. This class is a concrete subclass of OutputStream. Example:

package tutorial;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;/** * This class shows how to write a . . . →Read More:Writing files in Java

Reading files in Java

By Oleg Mazurashu,on February 25th,2010%

I am going to show example which shows how to read a file in Java. If you want to read some file you should start with FileInputStream. This class is a concrete subclass of InputStream. It provides an input stream connected to a particular file. Example:

package tutorial;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import . . . →Read More:Reading files in Java

Getting system root directory in Java

By Oleg Mazurashu,on February 25th,2010%

If you are working with file-system in Java,you should understand that your program can run in other types of OS:(Windows,Unix,Linux). These OS has own file-system structure. For example you need to read or write file in Windows,which located at disk C:\,you should write:

File root = new File(“C:\\”);File dir . . . →Read More:Getting system root directory in Java

Getting path to user’s home directory in Java

By Oleg Mazurashu,on February 25th,2010%

There is a way to find out path to user’s home folder. Need to get system property:

System.getProperty(“user.home”);

That’s all.

Getting working directory in Java

By Oleg Mazurashu,on February 25th,2010%

Sometimes need to know path to your working directory. It is very easy. Here I am going to show snippet of code which helps with this:

System.getProperty(“user.dir”);

It returns String. Call it and you will know your current working directory.

Using InputStream in Java

By Oleg Mazurashu,on February 24th,2010%

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