ArrayList is an heterogeneous collection of objects where each object can be indexed individually. While writing an application there could be some scenarios where we have ArrayList object filled with ...

But we can use the Java classes Integer and Boolean instead. We can still add numbers and truth-values to the ArrayLists (for example 17 or false) and we can read the elements from the ArrayList () ...

1.a Add the following array as a global variable: int[] arr = { 28, 230, 9, 310,72} 1.b. Write a method, getRandom() that returns a random element from the above array. 1.c Add a setup method, from ...

To reset ArrayList we have two options, one is to use clear() method and another is to use removeAll(). We dont need to worry if size of the ArrayList is small i.e. 10 to 100. But if ArrayList size ...

We will focus on the relationship between polymorphism and Java inheritance. The main thing to keep in mind is that polymorphism requires an inheritance or an interface implementation. You can see ...