Looping and methods

Intermediate Java

Jim White

Java Developer

Combine loops and custom methods

Doubling values in an array
Finding the longest word in a list
...

Image of multiple gears connected

Loop through an array and square each element

class SquareIt {
    public static void main(String[] args) {
        int[] arr = {2, 3, 4, 5};
        int[] squaredArr = squareArray(arr); // squaredArr contains 4, 9, 16, and 25
    }

    static int[] squareArray(int[] arr) {
        for (int i = 0; i < arr.length; i++) { // Iterate through the array
            arr[i] = arr[i] * arr[i]; // Square each element
        }
        return arr;
    }
}

Find the longest word in an array

class LongestWord {
  public static void main(String[] args) {
    String[] arr = {"Jo", "Mia", "Emma", "Tom"};
    // Call the method to find longest word
    String longest = longestWord(arr); // Value is Emma
  }
  public static String longestWord(String[] arr) {
    String longest = "";
    for (String word : arr) { // Iterate through the array
      if (word.length() > longest.length()) { // Check if word is longer than longest 
        longest = word; // If word is longer, update longest
          }
      }
    return longest;
  }
}

Let's practice!

Intermediate Java