Java Learning note--java object creation, initialization, reference parsing

If there is a Class A.

1. For example, the following expression:

A a1 = new A ();

So a is a class, A1 is a reference. New A () is an object. Just A1 this reference points to the object of New A ().

2, also such as:

A A2;

A represents a class, A2 is simply a reference, and only the object that the A2 points to is null null.

3, again such as:

a2 = A1;

It represents the A2 is a reference, A1 is also a reference, in this process A1 the address of the object to the A2, making A2. A1 points to the same object.

4. References

As in the following code snippet:

int k; Base data type

A; Reference data type

A = new A ();//Class A as a template in the heap of space to create a Class A object, also known as the initialization of the object

b b1,b2,,,, bn;//assumes that B is an abstract class or interface

Java Learning note--java object creation, initialization, reference parsing