Java Object creation Process

Java Object creation Process

In some projects, a static block is used, and other objects are initialized in the constructor ... A deep understanding of the Java class initialization process, which will not be a problem.

What are the steps of the Java object?

Assuming that there is now a people class and no other classes are shown, the initialization process is like this.

1 The Java interpreter must look up the classpath to locate the People.class file. When the object is first created (the constructor is a static method), or when the static method/static domain of the People class is first accessed.

2 load People.class, all static initialization actions are performed, and static initialization occurs only once when the class object is first loaded.

3 When you create an object using New people (), you will first allocate enough storage space on the heap for the object.

4 Initialize the storage space to binary 0.

4 performs all initialization actions that appear at the property definition.

5 executes the constructor.

See an example:

 Public class Bowl {    Bowl (int  marker) {        System.out.println("Bowl (" + marker + ")");    }     void F1 (int  marker) {        System.out.println ("F1 (" + marker + ")");}    } 

 Public class Table {    staticnew Bowl (1);    Table () {        System.out.println ("table ()");        BOWL2.F1 (1);    }     void F2 (int  marker) {        System.out.println ("F2 (" + marker + ")");     staticnew Bowl (2);}

 Public class Cupboard {    new Bowl (3);     Static New Bowl (4);    Cupboard () {        System.out.println("cupboard ()");        BOWL4.F1 (2);    }     void f3 (int  marker) {        System.out.println ("F3 (" + Marker + ")");     staticnew Bowl (5);}

 Public classstaticinitialization { Public Static voidMain (string[] args) {System.out.println ("Creating New Cupboard () in main"); Newcupboard (); System.out.println ("Creating New Cupboard () in main"); Newcupboard (); TABLE.F2 (1); CUPBOARD.F3 (1); }    StaticTable Table =NewTable (); StaticCupboard cupboard =Newcupboard ();}

The results of the operation are as follows:

The initialization analysis is as follows:

Java Object creation Process