Java is pass/call by value or pass/call by reference [MOST IMP. JAVA INTERVIEW QUESTION]| ode Decode

Thank you ma'am, I have been asked this question in interview and I was unable to answer properly, now I am confident on this topic.

Ma'am I am having a doubt, starting 4 mins of the video where you said "to access a private method you have to make it static", I didn't get that point. Please explain.

Good Video

Nice Video

Nice explanation

The topics you cover here are so unique !!! I have seen many tutorials for Java..... But the type of topics you cover here and the explanation is top notch!!! ❤ Thank you for your efforts 🎉❤

Thanks for this crystal Clear Explanantion .

Did u said that u a passing object by value at the end ? When u actually passing the reference!

Excellent

Pass By Reference: Changing the value of the real address in the memory.
Pass By Value: Copying the value to another location and so the real value is not changed.(java)

you rock

Thank you mam I had understand very clearly but one doubt raised in mind that why java is particularly called pass by value here we are doing both pass by value and pass by reference can you please explain mam?

how to write junit ?


myovject oldermethod()
{
other call//
hashmap map = new hashmap():

NewObj obj = service.myservice(map);
//logic

value = map.get(0); // here i am getting null pointer in junit test

return myobject;
}


class myservice{

NewObj myservice(hashmap map)
{
//logic

map.put(key,value):
return Newobj;
}


}
after that i am getting null if i mock the myservice ...how to write junit for oldermethod()

call by rfrnce vs pass by rfrence same or
dfrnt

Thankyou mam.. for explaning this in a wonderful way

Mam im getting really confused with this concept? Please help me to understand

Hum value bhi pass kr rhe hai aur object reference bhi pass kr pa rahe hai to java sirf passed by value kyu 🤔?

JAVA IS ALWAYS PASS BY VALUE ALWAYS

Thanks 👍

God bless you mam for your good work…your work really helps people….keep up!!!

nice explanation however had a doubt, since java is pass by reference for object as per your example for Animal Object.
i tried the same example with Integer since its an Object, the same was not happening.

Please check the below example.
public static void main(String[] args) {
Integer i = 10;
change(i);
System.out.println("main"+i);//op is 10

}

public static void change(Integer i) {
i =11;
System.out.println("method"+i);//op is 11
}

Best explanation ❤️

Super 🌟

Need small clarification, when primitive variable 'a' passed as an argument to a method you said java copies the value of 'a' to a new memory location and that location address passed to that method as argument so value wouldn't update in parent class ? Same theory isn't applicable to objects ? Java doesn't copy the object to different memory location and sends that memory location address to method as an argument ?

Today this question asked by interviwer...I got trapped... there is mutable/immutable thing also matter to this pass by value or reference. Please clear this also.

Best explanation !

Nice explanation!

I am unable to understand madam

seen many videos from your channel, everything is on point explanation and also the slides are perfect to read even though there is no audio. where can we find all your presentation slides?

So can we say, java is pass by reference for non-premitive data types?

vera level

The video views is equal to your subscriber count

Best explanation by far

Pl make it more clear.

So we can say reference is passed as value so reference doesn't change but object value gets change in case of passing reference?

Its still not clear to me-
Example 1-
If I just add tempList in my base case then I get [] [] [] [] as and, as it holds the reference and it gets modified in the recursive calls, so at each step when it hits the base case I need to capture the then state of the arraylist and store it in the res.


private static void backtrack(List<List<Integer>> list, List<Integer> tempList, int[] nums, int remain, int start) {
if (start >= nums.length && remain != 0) {
return;
} else if (remain == 0) {
list.add(new ArrayList<>(tempList));--> if I do not make a new list out of it , it gets modified. REFERENCE VAIRABLE THATS WHY!!
} else {
for (int i = start; i < nums.length; i++) {
if (nums[i] > remain) {
break;
}
if ((i > start && nums[i] == nums[i - 1])) {
continue; // skip duplicates
}
tempList.add(nums[i]);
backtrack(list, tempList, nums, remain - nums[i], i + 1);
tempList.remove(tempList.size() - 1);
}
}
}

But in this example, even if I set the prev pointer when my left recurison ends for the first time
,still its value is null when it backtracks-

private void convertBtToDll(Node temp, Node prev) {
if (temp == null) {
return;
}

convertBtToDll(temp.left, prev);

// marks the head -- leftmost node
if (prev == null) {
head = temp;
}

// make the links for the other nodes
else {
temp.left = prev;
prev.right = temp;
}
prev = temp; ----> even if I set it here it is null?????? why? isn't it a reference variable?
convertBtToDll(temp.right, prev);
}

public static void main(String[] args) {
ConvertBTtoDLL2 btToDll = new ConvertBTtoDLL2();
Node root = new Node(10);
root = new Node(10);
root.left = new Node(12);
root.right = new Node(15);
root.left.left = new Node(25);
root.left.right = new Node(30);
root.right.left = new Node(36);


System.out.println("After conversion to DLL");
Node temp = root;
Node prev = null;
btToDll.convertBtToDll(temp, prev);
btToDll.printDll();

}

Real time example is very easy to understand, thank you...

This is too much of a hindi accent to take in..

Thank You for making this video. Need small clarification, when primitive variable 'a' passed as an argument to a method you said java copies the value of 'a' to a new memory location and that location address passed to that method as argument so value wouldn't update in parent class ? Same theory isn't applicable to objects ? Java doesn't copy the object to different memory location and sends that memory location address to method as an argument ?

This is very helpful video. Thanks a lot for explaining this👍

java is strictly pass-by-value method 'arguments' "value" initializes and assigns newly created method 'parameter'value

still a bit confusing about pass the object as a parameter

It is perfect explanation. But still, can you please add new video on this with detail explanation and example.

Awesome explanation

Thank you so much Ma'm to clearing my Concept... & Congratulations for a new subscriber 😉

You missed to mention difference between int and animal ...

THIS IS GR8!!!

You did an excellent job explaining, thank you so much!! =)