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ArrayList What’s an ArrayList? Oracle documentation defines an ArrayList as a resizable array that implements List interface. ArrayList comes with a ton of methods that allow manipulation of the array. Some of the methods applicable in ArrayLize include, size, add, get, set, isEmpty and more. I will show how some of the methods work with using code. When defining an ArrayList, it is important to specify the type because ArrayList holds objects. Above,we have specified the type as String. As such, the ArrayList defined will only be able to hold elements of type String. Adding Items to ArrayList ArrayList provides add method that can be used to add items to ArrayList. The method can be called using ArrayList variable defined earlier. In our case, we have created a method and passed an item that will be added to ArrayList using add method. See the following screenshot: : Print items in an ArrayList I mentioned earlier that ArrayList provides several methods to manipulate d...

For us to understand arrays in Java , we’ll write a small program that sorts a list of integers in descending order. The program uses arrays, and it is expected to sort the values in descending order- from the highest to the lowest value. For instance, if the user of the program passes in these values, 1,10,24,56,90,71,2. The values should be sorted in a descending order, meaning that the output should be 90,71,56,24,10,2,1. The program will be set up in a way that numbers to be sorted are read from the keyboard. In addition, the program implements the following methods, sortIntegers – to sort an array of integers and return a new array that contains sorted numbers. The printArray method to print sorted integers and getIntegers to return an array of numbers entered from the keyboard. getIntegers method The method takes one integer value which determines the size of an array and uses for-loop to get integer values from the keyboard and returns an array of integers. Here is a sc...

In many cases, text is one of the most common forms of data in a program. All programming languages have to handle strings in one way or another. Python makes it easy to handle data with strings. You can concatenate two strings using + operator, convert a letter uppercase or lowercase, remove spacing in string, check if string contains an alphabet character and more. Examples string literals “That’s a nice car.” “Today is Jane’s birthday.” We can assign any of string literals above to a variable and print them on an interactive shell. We can also change a string to lower or uppercase using some of the useful methods such as lower() and upper(). If we want to confirm if a string is in lowercase or uppercase, we can use islower() or isupper() functions. We can confirm this on interactive shell, see below. If we have a list of strings that we want to join, join() can be used. We can also split a string using split() method. I will write a code showing how the split meth...

  Problem and Solution  Here are the instructions of what is expected of this game: You have been assigned a task to implement the Hangman game. In hangman, one player chooses a secret word and the other player guesses letters. Each time the second player guesses a correct letter, all instances of that letter in the secret word are revealed. If the second player guesses a letter that is not in the word, then a portion of the hangman is drawn. The game ends once the entire hangman is drawn or the second player guesses all the letters that are in the word. NOTE: The second player has 7 guesses to guess the correct word After each incorrect guess, the pieces of the hangman are drawn in the following order; Rope, Head, Torso, Left arm, Right arm, Left leg, Right leg At the beginning of the game, the first player should be asked to enter the secret word The letters in the secret word should be displayed as '?' until the user guesses them  At the beginning of each round you sho...