Core Java With OCJP/SCJP: OOPs(Object Oriented Programming) Part-12 || instance control flow

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[@pradeepkumar-lb1ym]

Great class by durga sir on instance members , variables, methods and blocks

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[@sumitbadugu417]

Please make video on DSA

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[@najusg1762]

sir, you have mentioned order of instance control flow between parent and child classes during object creation in child class. 5 rules are mentioned for the flow. In 3rd point it is mentioned that execution parent construtor and in 5th point execution of child constructor. so my doubt is as compiler codes every constructor with super(); statement as its first statement therefore does parent constructor will again be called on execution of child constructor i.e 2 times execution once as per 3rd rule and once as per 5th rule but as per output parent constructor gets called only once. what are the reasons?? what is my misconception??

[@anand_kanekal]

I guess, your question is valid.

[@sandeepmachiraju1263]

class Parent { int i = 10; { System.out.println("IN PARENT INSTANCE::"+i); } Parent() {System.out.println("IN PARENT CONSTRUCTOR");} Parent(int x) {System.out.println("IN PARENT INTEGER CONSTRUCTOR::"+x);} } class Child extends Parent { int j = 10; { System.out.println("IN CHILD INSTANCE::"+j); } Child() { super(10); System.out.println("IN CHILD CONSTRUCTOR"); } public static void main(String[] args) { Child c = new Child(); } } Output: IN PARENT INSTANCE::10 IN PARENT CONSTRUCTOR integer::10 IN CHILD INSTANCE::10 IN CHILD CONSTRUCTOR

[@jonassx100]

so what you want to say

[@jonassx100]

i have sasme doubt

[@MoytriBarman]

It may help, after creating the child() constructor the flow of program jumps from Child class to parent class. Then after going to parent class it --> 1. it identifies the instance variable and blocks inside parent class. 2. execution variable assignment and blocks execution. 3. execute parent constructor --> Then come back to child class and repeat this steps for Child class. To understand the flow - best to do debug your code. stackoverflow.com/questions/19561332/in-what-order-do-static-blocks-and-initialization-blocks-execute-when-using-inhe

[@rajeshyadav-cw6vc]

Thank you sir🙏🙏🙏🙏

[@mohanrammanikandan7939]

Thank you so much , sir. I have a doubt. I see no difference in execution order between static flow and instance flow. Both will have their parents' members get executed and then comes to child. What is the difference in the order ?

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[@yajnaseneesahoo2079]

Respect u sir

[@AnishKumar-ie3ib]

sir i have one doubt when child constructor will be executed than super() will be added by compiler by default if we are not writing this or super than in this parent ,child instance control block flow why parent constructor is not executed again when chid class constructor is executed. can anyone tell me?

[@jonassx100]

i have the same doubt , did you get answer

[@dreamcatcher9712]

I too have same doubt 😅

[@shankars4281]

When we create object of child, childs constructor is called. If child constructor doesn't have super() as firsts line, compiler inserts it and this leads to loading of parent class. Then, in parent class, static block, variables are executed followed by parent constructor. So, parent constructor executed only once.

[@Iamnoone56]

Sir is there any difference between these oops video and that 10 hour video of oops uploaded in the same playlist here...does it is about new java version or content is same??

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[@balla4004]

Bro can u please say Is there any difference between those oops video's and that 10 hours video?

[@Iamnoone56]

@@balla4004 no bro no diff this is latest but i will recommend you to go with older one

[@balla4004]

@@Iamnoone56 thank you! Did you watched entire series'

[@Iamnoone56]

@@balla4004 ya all 203 videos 😅

[@indrajitpatil4864]

Sir, Can we call non-static method in static block directly ?

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[@vkj5742]

SIR, why is it necessary to create object in parent class, because by default every instance block is also available to the child?

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[@heavenlyway5824]

What is meant by at the time of class loading or class loading

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[@AbhishekKumar-su2du]

In the video, it is mentioned that compiling the parent source file generates two class files. I think this will only happen when we compile the child source file. Please confirm.

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[@bookswithpriya]

In only one source file both child and parent code is there . We can give any name to. Java file. We will get .Class for every class in that . java file

[@jonassx100]

At last when child constructor gets executed , wouldnt it call parent class constructor as super() is added by the compiler

[@shikharchaurasia1384]

no it has already called the parent constructor in the beginning

[@payelchowdhury5034]

what is about the parent class main method execution??

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[@shikharchaurasia1384]

parent class main method will only be executed if we call parent class

[@swathib7380]

sir, one doubt ! if static control flow is executed first, then in instance control flow the static main method should execute first why the instance blocks and constructor executed then the static? please clarify

[@DurgaSoftwareSolutions]

Hi swathi B can u access kzbin.info/www/bejne/p2XLk3SabMh7q7M&lc=z12fvzajpkzujd3ux23usfujbsqnsbl0p

[@ramcharan-vq9kx]

hello swathi, sorry to say this.....your question is absolutely wrong... please watch the video as many times as you can... then you will get clear idea... my question is --------- how can a static main method is executed in instance control flow they are two different flows.. so, don't mix them. you said wrong : " first instance blocks and constructor executed and then static......." then right is : "first static flow starts.... then instance flow starts after completing static flow and when we create an instance of a class(i.e., object) only. see my next comment for both control flows...

[@ramcharan-vq9kx]

first static control flow starts ...... 1. there is only on static block i.e., main method . so , starts its execution..... and static flow completes. 2. static flow completes because execution of static main method is the last step of static flow... 3. now in main method there is an object create right......i.e., the object calls to the constructor... 4. now instance flow starts.... but before calling the constructor..... 5. instance flow is.... a)identification of instance members from top to bottom b)execution of instance variable assignments and instance blocks c) then execution of constructor..... so, after execution of constructor ... the instance flow completes........ ============================================================ then if any statements present in the main method will be executed...... and here we completed the program......

[@ramcharan-vq9kx]

In facebook i have a page "JAVA and Android" you can post any doubt related to these beautiful technologies........... SURELY, we will answer you.... please like ----->>>>> facebook.com/java.android.forum =============== THANK YOU ===============

[@jonassx100]

At last when child constructor gets executed , wouldnt it call parent class constructor again as super() is added by the compiler

[@fazilzeynalov1098]

share lessons about java.swing library please

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[@surajbalore888]

sir, what will be output if we only execute parent class in your above video...(instance control flow)

[@devwithyash]

0 parent instance block parent constructor parent main

[@KeshavSharma-in4hk]

Well I have a doubt how can be instance methods be counted as Instance block ... Instance blocks are only executed when they are called IDK will the team will look at it So if anyone knows please tell me according to chatgpt instamce methods are not part of instance block

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[@lovefrommars7468]

What if there r multiple constructors in both parent and child class

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[@fazilzeynalov1098]

constructor is called whichever you use while creating the object

[@Yashkumar-m05]

What if we are creating parent object in child class ?

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[@ramcharan-vq9kx]

=========================== THANK YOU DURGA SIR........ YOU ARE MY @@@@@@ JAVA GOD@@@@@@ ===============================================

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thank you ram charan

[@atoz4055]

62 videos completed 😅

[@sureshkumarprajapat7470]

sir can u explain control flow to this code class par{ int i=15; int k=44; public static void main(String[] args) { System.out.println("its p main"); } { m1(); System.out.println("first in p"); } par(int y){ this.k=y; System.out.println(y+"its parent constructar"); System.out.println("its parent constructar"); } void m1() { System.out.println(i); System.out.println("its p private m1 "); } void m2(){ System.out.println("its p m2"); } int j=22; } class chi extends par { int i=5; public static void main(String[] args) { chi c=new chi(999); System.out.println(c.k); System.out.println("its c main"); } { m1(); System.out.println(k); System.out.println("first in c"); } chi(int x){ super(x); System.out.println("its child constructar"); } void m1() { System.out.println("its c private m1 "); } void m2(){ System.out.println("its c m2"); } int j=24; }