msarmadqadeer / java-tasks

These are all java tasks that I created during studying programming fundamentals subject.

java-tasks

These are all java tasks that I created during studying programming fundamentals subject.

fun fact 😂

In the above Java files, there is a file SarmadiList.java.

story behind SarmadiList.java

When we studied Arrays in Java, we came to know that in Java the length of Arrays is immutable (fixed). And we cannot append any item to Arrays in Java as we do in Lists in Python.

At that time I created a method in Java that takes two arguments and returns a new array.

1. 1st Argument is an Array in which I want to insert another entry.
2. 2nd Argument is a Number that I want to insert at the end.

public static int[] append(int[] list, int value) {
    int[] newList = new int[list.length + 1];
    for (int i = 0; i < list.length; i++) {
        newList[i] = list[i];
    }
    newList[newList.length - 1] = value;
    return newList;
}

What it does is that it creates a new Array with the length of 1+ in the length of the previous Array. After that, it inserts all the values of a previous Array into the new Array, and the number that it takes as a 2nd argument is inserted at the last index of the new Array. Finally, it returns the new Array.

After doing this, I felt like I conquered something 🤣.

what I learned ✨

When I show this to my teacher, he told me that by doing this I am creating a new Array in memory and not appending it at the end of that previous Array, which is not memory efficient.