How a class refers to a member variable or method of another class

Commonly used are: A class has a variable c,b class want to call C
Method One:
Variable c is non-static (static), then an object of Class A is created in class B, using the object. Variable name.
Method Two:
Variable c is static and is used directly from the class. Variable name


For more information, refer to this library:
Http://wenku.baidu.com/link?url=tyAAmJNGxBnXLnGLDK5of8B23KOMltUXNIA3rpD6U23F460ot_ Y7gvfy51utrku2t6wyzugjx5wodmy623d5pgdwy-wr3ucxzzfvpn5i0e3

How a class refers to a member variable or method of another class