Monday, 4 January 2021

For Automation Testing and SDET profile, two concepts of Java are very important: List & Array. Let's try to explore some of the concepts below.

Check out the questions from 1 to 10 below:

Qus Set - 1 to 10

Question set 11 to 20:
Qus Set - 11 to 20

Question set 21 to 30:

Qus Set - 21 to 30

Question set 31 to 40:

Question Set 31-40

Question set 41 to 50:

Q&A Set 41-50

Let's assume we have below arraylist:

ArrayList<String> arrlst = new ArrayList<>();

How to remove a SubList from a List in Java ?

Ans: List.subList(int fromIndex, int toIndex).clear()
How to do Sorting of An Array?

Click Here For Answer
Difference between ArrayList and HashMap in Java?

==>ArrayList implement List Interface while HashMap is an implementation of Map interface.

==>ArrayList maintains the insertion order while HashMap does not maintain insertion order.

==>ArrayList allows duplicate elements while HashMap doesn’t allow duplicate keys but does allow duplicate values.
How to add element to arrlst?

Ans: arrlst.add(element);

Does list maintains insertion order?

Ans: Both the ArrayList and LinkedList maintain the elements insertion order which means while displaying ArrayList and LinkedList elements the result set would be having the same order in which the elements got inserted into the List.

Top Kubernetes Commands-Click Here
How to get length of Array and List?

Ans: arr.add(index,element);

How to get element or index in arrlst?

Ans: arr.get(element);
arr.get(index);
How to Declare, Create and Initialize Array on same line
Click Here For Answer
How to remove element and index in arrlst?

Ans: arr.remove(element); //returns boolean value
arr.remove(index);//returns boolean value

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How to get duplicate elements in an array?Very Imp
Click Here For Code
How to set a specified value to a specified index of arrlst?

Ans: arr.set(index,element);
Difference between an array and an ArrayList in Java?

Ans: The main difference between array and ArrayList is that the array is static and the arraylist is dynamic. We cannot change the size of the array once created, but ArrayList can increase its size automatically.
Explore more java related questions : Click here for Java Coding Q&A
Bonus Questions:
--> Difference between arraylist and linkedlist?
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