Well heres your answer........
These are great tool to test the game/ Application before you upload them to your phone.
There are two tools with witch you can do that....
1) Sun Java Wireless Toolkit
2) S60 3rd Edition SDK for Symbian OS, Supporting Feature Pack 1, for MIDP
Sun Java Wireless Toolkit
The Sun Java Wireless Toolkit (formerly known as Java 2 Platform, Micro Edition (J2ME) Wireless Toolkit) is a state-of-the-art toolbox for developing wireless applications that are based on J2ME's Connected Limited Device Configuration (CLDC) and Mobile Information Device Profile (MIDP), and designed to run on cell phones, mainstream personal digital assistants, and other small mobile devices. The toolkit includes the emulation environments, performance optimization and tuning features, documentation, and examples that developers need to bring efficient and successful wireless applications to market quickly
Here are some of the screen shots of Sun Java Wireless Toolkit


Follow the Link to download Sun Java Wireless Toolkit . This is 37.3 Mb download
But for Wireless Toolkit First the jar file has to be conver to jad file and both of them kept at the same location

Download Jar To Jad converter 175 Kb
Mirror 1
Mirror 2
S60 3rd Edition SDK for Symbian OS, Supporting Feature Pack 1, for MIDP
This is an emulator from nokia where you can test your java applicaitons and games. Almost all applications and games run on it , but the applications which requires to use the phones memory ( Not the RAM memory ) or card memory may not even install at all. This thing can run symbian applications also. As the name suggests it is made for the Symbian S60 3rd Edition OS. So it can run applications and games having .sis and .sisx extension.
Here are some of the screen shots of the Nokia SDK


Click the link to download Nokia S60 3rd Editon SDK . This is a huge 240 Mb download
