ArrayList In Java + Notes | Java Placement Course

Legend Watching at 2X

🥳 Good to learn it 🙇

Thank you so much Shraddha Didi you saved me from getting depressed!!

I use full ArrayList type 😊

Most weird thing when she moves her hand too much.

omg

What is the difference between Collection vs Collections...?
please anyone explain!!

Nice

Thank you Didi..:)

.

Explanation Level 💯
After your explanation about arryalist i have come to know about arraylist perfectly..🫡

Heap nahi karaya sayad

Can u teach in English it very useful 😅

Descending order me sorting kaise kare??

Thank you didi

madam can't access the notes

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Hii Dii I have a prblm in ArrayList when I type the same code according to you it show an error in which it say { This type ArrayList is not generic, it cannot be parameterized with arguments <Integer>} I have tried many times can you pls help me .........

No lag clear cut explanation without much theory

I think you explain well but there is a lack on concepts which I see. When we are teaching, we need to be much responsible and very clear on our concepts. I went through the video to understand the internal working on ArrayList then I went back to the open code of Java and checked the implementation. Arraylist internally uses ARRAY which is 100% continuous. However here instead of the values as primitives, each index stores the reference to an object in the memory. Thus, we call it stores the data in non-continuous way. But array in itself is continuous in Arraylsit too. Secondly, the YES we need to copy all the elements when an Arraylist goes beyond size and hence it is costly. Only thing which is better here is instead of copying the values we copy the references to the new Array. Thus, the previous objects stay in memory and need not be moved but the older array has to be copied to the newer one and older array becomes eligible for garbage collection.

Not to demoralise; you are doing great, but please study and prepare the things thoroughly when you post it as a lecture as it may give incomplete/incorrect concepts to the viewers.
Thanks for the video though. All the best!

Didi you're far better than any idiot on you tube creating junk videos

Why didn't we write Boolean in the closing generics (on the right side)?

I Liked the whole lec shraddha di❤thank you so much for such Content.

over perfection in your videos !

Hi ...why don't teach in English...so that everyone can understand... please make the tutorials in English....

hi, can you tell me how to add resultset of 500 rows inside a list? and pass it to view page. I have added my own model object in list in dao class and send it to controller. From controller, i added the list values in addAttribute method of Model class and fetch it in jsp page. I am facing the issue, it shows the last record of my resultset 500 times in view page..plz suggest on it....and i am printing my list it shows like my model class name 'DK_Model'@367387fe44 like something while printing the list

Didi please library classes pe vdo banao class 10th ke liye

you are so Kind, I think you looks like Punjabi? Isn't it? Though have to say this, You were Rocking, Utub has lot of platforms,channels to learn new things,but You hven done Great job, More informative,developing, thank you & team,🥰

public class CreateArrayList<T> {

T data[];
int size;

CreateArrayList()
{
this(1);
}
CreateArrayList(int inicap) {
if(inicap>0)
data=(T[]) new Object[inicap];
else if(inicap==0)
data=(T[]) new Object[inicap];
else
throw new IllegalArgumentException();
}
public void add(T value)
{
ensureCapacity();
data[size]=value;
size++;
}
public void ensureCapacity() {
if(data.length<=size)
{
int oldcap=data.length;
int newcap=oldcap+1;
T temp[];
temp=(T[]) new Object[newcap];

for (int i = 0; i < data.length; i++) {
temp[i]=data[i];
}
data=temp;
}
}

public void add(int index,T element)
{
if(index>size || index<0 )
throw new ArrayIndexOutOfBoundsException();

ensureCapacity();
for (int i = size-1; i >=index; i--) {
data[i+1]=data[i];
}
data[index]=element;
size++;
}

public T get(int index)
{
if(index>size || index<0 )
throw new ArrayIndexOutOfBoundsException();

return data[index];
}

public void remove(int index)
{
if(index>size || index<0 )
throw new ArrayIndexOutOfBoundsException();

for (int i = index; i < data.length-1; i++) {
data[i]=data[i+1];
}
size--;
data[size]=null;
}

public int indexOf(T v)
{
for (int i = 0; i < data.length; i++) {
if(data[i]==v)
{
return i;
}
}
return -1;
}

public boolean contains(T find)
{
if(indexOf(find)!=-1)
return true;
else
return false;
}

public String toString()
{
for (int i = 0; i < data.length; i++) {
if(data[i]!=null)
System.out.print(data[i] + "\t");
}
System.out.println();
return super.toString();
}
public static void main(String[] args) {
CreateArrayList<Integer> c=new CreateArrayList(3);
c.add(5);
c.add(9);
c.add(4);
c.add(7);
c.add(2,6);
System.out.println(c);
/*
* c.remove(2);
* System.out.println(c);
*/
System.out.println(c.indexOf(4));

}

}

Is Array list non contiguous or contiguous?

Great 👍👍

Too good, explained the concepts very well

At 3 : 21 min - as you mentioned ArrayList is non -contiguous.?? but
ArrayLists use contiguous memory. All elements in the ArrayList are located next to each other in the same memory space. This is why retrieving an element from an ArrayList is so fast.

Thanku bhen

Thank you Didi..

I love the energizing background music at start...

In one of interview I have been asked question on default size of collection, so would be better if you will cover same topic along with one explanation on why collection framework use only Objects not primitve data type? @apnacollege

Thank you ma'am

Very helpful this video

Thank You😇

i she speaking english?

Kaash mujhe starting se aisi hi teacher mili hoti toh mai top karta har baar

Next time try to title your so called content in the language used in the video. I'm tired of this nonsense

Arrays in java are not continuous. Please don't provide wrong knowledge here.Kind request!

You said, arraylist is a list of arrays... how can elements be like integers.. can you explain how do we use functions of arraylist to get, update, delete arrays in arraylist..?

how to sort list of list

Thank you so much for informative session 😊

teching style is good

please dont make the title english if the video is not going to be english