Process analysis of object creation

Object creation process analysis

 Introducing constructors

Let's take a look at a case

class Person  //  class  Person
{
    
    int age = 90;
    String name;

    Person(String n,int a)  //  Constructors 
    {
    
        name = n;  //  Assign a value to a property 
        age = a;   // ...
    }
}

Person p=new Person(" Small qian ", 20);

stay JVM Memory analysis

Process analysis ( The order must not be disordered )

1. First, it will be loaded in the method area Person Class information ( Person.class), It will only load this time
2. Conduct new Person(“ Small qian ”,20) Allocate space in the heap ( Address ), Create objects
3. Complete object initialization
   a. Default initialization age = 0 name = null
   b. Explicitly initialize age = 90 name = null
   c. Constructor initialization age = 20 name = Small qian
4. Put the address of the object in the heap , Return to P(P Is the object name , It can also be understood as a reference to an object )

 Constructor not introduced

Deepen understanding and backtracking

Code

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