Northstar Learning › Coding course

Learn Java by doing

300 quests · types, loops, methods, collections and exceptions

300 questions · free · no account needed · works offline once loaded

What you will cover

• Integer arithmetic
• String concatenation
• Integer division
• Comparison and logic
• Conditional branches
• For loops
• Methods and return
• Array indexes
• Array totals
• String length
• Substring boundaries
• ArrayList operations
• Maps and defaults
• Value equality
• Remainders
• Repair a boundary
• Repair a return
• Repair string comparison
• Choose a type
• Exceptions and parsing

Try some questions

Tap a question to see the answer and why.

public class Main {
  public static void main(String[] args) {
    int adults = 3;
    int kids = 2;
    int price = 8;
    System.out.println((adults + kids) * price);
  }
}

Play with friends

Northstar also has a group quiz: host a live room, run one on a single screen, or send a friend a challenge link.