Good IDE and Compiler for JAVA

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http://androidforums.com – I am looking for a app that I can run on my tab that will replace my laptop in my CS2 class. I am looking for a app that is easy and that doesn't just compile apk or ment for android. Also one that will work with drop box. As of now I am using jGrasp but am trying to use Net Beans and ellipse. Free also helps but can be less then $10. Thanks (General)