Quoting several sources here from a simple google for java vs C++
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The biggest potential stumbling block is speed: interpreted Java runs something like 20 times slower than C. Nothing prevents the Java language from being compiled and there are just-in-time compilers appearing at this writing which offer significant speed-ups. It is not inconceivable that full native compilers will appear for the more popular platforms, but without those there are classes of problems that will be insoluble with Java because of the speed issue.
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Java uses a singly-rooted hierarchy, so all objects are ultimately inherited from the root class Object. In C++ you can start a new inheritance tree anywhere, so you end up with a forest of trees. In Java you get a single ultimate hierarchy which is very restrictive.
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[quote]No inline methods. The Java compiler may decide on its own to inline a method, but you don