What is an ArrayList? #shorts #java #array

Let's solve the following computer science question. It asks, consider the following code segment. What is printed as a result of executing the code segment in order to solve this, let's read the code, let's understand it. And let's apply that to arrive at our answer. In the first line of the code, we are constructing an array list. In Java, an array list is a variable length list, which allows you to add values, set values, remove values, and so forth. The array list is called animals. Initially the value dog is added to the array list. Next, the value cat is added to the array list. Then the value snake is added to the array list. These values are at index zero one and two. At this point in the execution, this line here is setting the value at index two to lizard, which will effectively overwrite the valued index too. So snake will become lizard. And so we end up with dog cat lizard. Next, we are adding the value fish at index one. What this does is it will insert the value at index one, which means that fish will be inserted here. Index one is the second element in the list leading us to have dog fish, cat lizard as our four elements at this point, the next line removes the value at index three. So index one is dog, sorry. Index zero is dog index. One is fish index. Two is cat and index three is lizard. If we are removing index three, then lizard is gone. Meaning that the final state of our list is dog fish cat. That is our full array list. Looking at the options here, that corresponds to answer a, and that's our final solution here.