For many beginners only C language, the face of java learning basic grammar, but find it hard, in fact, the biggest problem is not the syntax difficult, but change a programming idea. Process-oriented is to package your code into a function, and then turn to do one thing, the process is for you to do as abstract objects, tell the object to do. So, we need to learn java entry, you must know the concept of classes and objects.
1. classes and objects;
2.java three characteristics language, encapsulation, inheritance, polymorphism;
3. Some key study (static, final, abstract, extends) and so on.