Further discussion on objects

1. You can use an object as a member field in Java. It is similar to the basic data type as a member field. When using this field, you must first instantiate the object, there are two methods:

Class A {} Class B {A; B () {A = new A (); // first method} class c {A = new (); // type 2}

2. Access to object fields and Methods

Access methods are divided into object fields and object methods, and each method is divided into static and non-state methods.

3. Use an object as a method parameter for transmission.

4. Use an object as the return value of the method.

Further discussion on objects