Java Object-Oriented---class-to-object relationships

A class is a description of a certain class of things, which is an abstract, conceptual meaning. An object is the actual existence of every individual of that kind of thing, also known as an instance.

Creating objects: including declaring objects and instantiating objects

Person person;//Statement

person = new person ();//instantiation

Create an Object memory partition

1, the Declaration of a space to open a stack

2. Instantiation opens up a heap of memory space

3. Declaration point to instantiation: the person in the stack space is pointing to the instantiation of the heap space

Java Object-Oriented---class-to-object relationships