我想学JAVA,但是不会C++.能行吗?

完全没问题！
这两种语言相关性不大啊，每一个都是独立的目前很流行的高级开发语言，可以只学java

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回答：行

虽然很多人建议不学习C++直接学习Java
根据我个人的经验和发展来看 我建议你先学习学习C++

可以，其实C++比Java难，或者说Java其实是C++的一个子集，C++被称为程序员的语言，所以先学Java是个很好的选择，或者你可以先学习C语言，在Java后C++。但无论如何，直接学习Java还是比较容易的

两种不同的语言，不存在必要性

java更多应用于网络编程方面，C应用于系统工程，应用软件编程

可以的