Custom Collection Development Part 6 | Core Java Tutorial | Mr. Hari Krishna

Core Java Tutorial | Mr. Hari Krishna

Welcome to the Core Java Tutorial Series! In this video, we introduce the essential concepts of Core Java and guide you through building a strong foundation in Java programming. Perfect for beginners and those refreshing their Java skills!

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Please write back to us at

[sureshgarine]

thank you, sir, for handling all the edge cases makes a difference between average and good programmers.

[MUKESHKUMAR-vhmb]

Thank you sir...Feeling comfortable and confident because of one and only ..You Sir

[gopichinna]

Hello sir, you haven't teach how to override the toString method to display the all contents(objects) of the Collection object at a time.Thank you.

[SassyLishC]

Hi
Please make videos on hash code & toString topics

[AbdulRehman-jbon]

when i run the program "system.out.println(col);

[Anilpal-hrwd]

sir, one question ask in interview that

Q -> i have ArrayList in that array list duplicate object is there to remove the duplicate from ArrayList without using Set or remove() i have to remove duplicate how can i do this

[sachinpandey]

public class Test {


Object objarr[]=new Object[10];
public int elementCount=0;

public void add(Object obj){



incrementCapacity();
}

objarr[elementCount]=obj;
elementCount++;
}
private void incrementCapacity() {
// TODO Auto-generated method stub
int newCapacity=objarr.length*2;

Object nextArray[]=new Object[newCapacity];
for(int i=0;i<objarr.length;i++){

nextArray[i]=objarr[i];
}
objarr=nextArray;
}

private void getArrayElement() {
// TODO Auto-generated method stub

for(int i=0;i<objarr.length;i++){

System.out.print(objarr[i]+" ");
}

}

public void remove(int index){

if(index < 0 || index>=elementCount){

throw new not exist");
}

else{

for(int


objarr[elementCount]=null;
}
}
}

public void replace(int index, Object rep_obj){

if(index<0 || index >=elementCount){

throw new not replace");
}
else{

objarr[index]=rep_obj;

}


}
public static void main(String[] args) {
// TODO Auto-generated method stub

Test test=new Test();
test.add("1");
test.add('2');
test.add(3);
test.add(4);

System.out.println("Element before deletion");
test.getArrayElement();
test.replace(0, "Sach");
// test.remove(3);
// System.out.println();
System.out.println("Element after replace");
test.getArrayElement();
}

}