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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		new Child();
  13. 	}
  14. }
  15.  
  16. /**
  17.  * This example demonstrates the order of class and object initialization.
  18.  * Class initialization:
  19.  * 1. static fields and class initializers in order of declaration.
  20.  * Object initialization:
  21.  * 1. parent constructor execution
  22.  * 2. object fields and instance initializers in order of declaration
  23.  * 3. rest of constructor
  24.  */
  25. class Parent {
  26.     Parent() {
  27.         System.out.println("I'm parent!");
  28.     }
  29. }
  30.  
  31. class Child extends Parent {
  32.     static Field staticField = new Field("I'm static field!");
  33.  
  34.     Field field = new Field("I'm field!");
  35.  
  36.     {
  37.         System.out.println("I'm instance initializer");
  38.         field = new Field("I'm field in instance initializer!");
  39.     }
  40.  
  41.     static {
  42.         System.out.println("I'm class initializer");
  43.     }
  44.  
  45.     final static Field staticFinalField = new Field("I'm final static field!");
  46.  
  47.     final Field finalField = new Field("I'm Final field");
  48.  
  49.     public Child(){
  50.         System.out.println("I'm child constructor!");
  51.     }
  52.  
  53.     public static void main(String[] args) {
  54.         new Child();
  55.     }
  56. }
  57.  
  58. class Field {
  59.     public Field(String argument) {
  60.         System.out.println(argument);
  61.     }
  62. }
Success #stdin #stdout 0.04s 2184192KB
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Standard input is empty
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I'm static field!
I'm class initializer
I'm final static field!
I'm parent!
I'm field!
I'm instance initializer
I'm field in instance initializer!
I'm Final field
I'm child constructor!
https://ideone.com/NYDq8X
Class and object initialization
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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