Building your own methods

Intermediate Java

Jim White

Java Developer

Combine everything!

Create your own methods
- Including parameters
Control flow

➕ Strings, arrays, ...

Image of mixing things together.jpg

Check if number is even

class IsItEven {
  public static void main(String[] args) {
    int number = 2345;
    // Call the method and print the result
    System.out.println("Number " + number + " is even: " + isEven(number));
    }

  static boolean isEven(int n) {
    return (n % 2) == 0;  // Use modulo operator, that returns the reminder
  }
}

Number 2345 is even: false

Iterate through given String and print each letter

class PrintItOut {
    public static void main(String[] args) {
        String name = "Hi";
        printLetters(name); // Call the method on name
    }
    static void printLetters(String str) {
        for (int i = 0; i < str.length(); i++) { // Iterates through given String
            System.out.println(str.charAt(i));  // Prints each letter out
        }
    }
}

H
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Let's practice!

Intermediate Java