☕➿ JAVA CERTIFICATION LOOP: can you find the OUTPUT in 20 seconds?
☕➿ JAVA CERTIFICATION LOOP: can you find the OUTPUT in 20 seconds?
It looks easy. That is usually when Java certification questions bite. 😈
🔸 TLDR
You have 20 seconds. ⏱️
What does this Java code print?
public class Quiz { public static void main(String[] args) { int i = 0, sum = 0; outer: do { if (i++ == 2) continue outer; sum += ++i; } while (i < 5); System.out.println(i + ":" + sum); } }
No IDE.
No debugger.
No running the code. 👀
Just trace it like you would during a Java certification exam.
This tiny question combines:
▪️ i++ — use the value, then increment
▪️ ++i — increment first, then use the value
▪️ do-while — the body executes before the condition is checked
▪️ continue outer — jump directly to the loop condition
⏱️ Target time: 20 seconds
🔸 TAKEAWAYS
▪️ Never treat i++ and ++i as interchangeable.
▪️ With continue, check exactly where execution resumes.
▪️ In certification questions, trace variables statement by statement.
▪️ Tiny loops can test much more than loop syntax.
What does it print? 👇
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🙋♂️Answer: "5:7"
Go further with Java certification:
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SpringBook👇
JavaFullstackBook👇