JAVA IDE'S

JAVA IDE'S FOR RUN JAVA PROGRAMS:
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An IDE (Integrated Development Environment) is a single program that lets you edit, compile, run, test, and debug programs, all in one place. If you do not have an IDE, you need to learn how to compile and run Java programs from the command line; this isn't difficult, just less convenient.

Except as noted, all these IDEs are free and will run on any computer system.
IDEs for beginners

BlueJ- is probably the simplest IDE; its main advantages are that it shows a diagram of how your classes relate to one another, and it has simple menus.

http://www.bluej.org/download/download.html

DrJava- is also simple; its main advantages are that it allows you to test out individual Java statements, and the editor is more powerful.

http://drjava.org/

JCreator- is another simple IDE; its main disadvantage is that it only runs on Windows. The LE version is free.

http://www.jcreator.com/index.htm

IDEs for professionals:
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Professional IDEs have many more features, Once you become reasonably comfortable with Java, you really should take the time to master a powerful IDE. You will be surprised at how much work it will save you.

Eclipse -is an extremely good and very popular IDE. It is the one I use.

http://download.eclipse.org/eclipse/downloads/

IntelliJ- Idea is said (by people who have used both) to be even better than Eclipse.

http://www.jetbrains.com/idea/download/index.html

NetBeans -is Sun's own IDE, and is said to be catching up with Eclipse. Its main advantage is that it can be downloaded along with the JDK (see above), hence is very well known. It also provides a visual GUI builder, but that relies on some packages that must be included with your program if it is to run outside the NetBeans environment.

http://www.oracle.com/technetwork/java/index.html

JBuilder-, by Borland, is probably the best commercial IDE; the "Foundation" version is free.