Text Editor

You can write your Java source code using any standard text editor, such as Notepad, Write, or Edit for Windows NT/95 users and TextEdit for Solaris users. A variety of text editors more suitable for development can be found on the Internet. You might want to use a text editor that comes with a development application, such as Visual C++. Java source code is generally saved with the extension .java.

The best and easy editor i suggest for writing a java program is editplus.You can download 30 days trial version from here