Java OCP 21 (1Z0-830) | Controlling Flow | Loops — for, while, do-while, for-each

Java OCP 21 Exam (1Z0-830) — Controlling Program Flow Series
Video : Loops — for, while, do-while & for-each

In this video you will learn:
✅ for loop — exact execution order: init → condition → body → update
✅ Condition checked BEFORE body on every iteration including first
✅ Loop variable scoped to the for loop — not visible outside
✅ Tracing a for loop completely — step by step
✅ The off-by-one trap — less than vs less than = changes iteration count
✅ while loop — condition checked before every iteration
✅ If condition false from the start — body never executes
✅ Tracing while loop — why n=10, n-=3 gives final value of -2 not 0
✅ do-while loop — body always executes at least once
✅ Condition checked AFTER body — the key difference
✅ do-while with initially false condition — runs exactly once
✅ The mandatory semicolon after do-while closing parenthesis
✅ for-each loop — iterating arrays and Iterable collections
✅ No index access in for-each
✅ Modifying loop variable does NOT change original array element
✅ Cannot iterate in reverse with for-each
🎯 OCP 21 Exam Objective:
"Create program flow control constructs including loops"

📺 Full OCP 21 playlist:
https://www.youtube.com/playlist?list=PLXgr9iga1fVwr0UPtK4bqLINB9qjwr-zq

⬅ Previous — Pattern Matching Switch, Sealed Interfaces & Records:
[Previous video link]

➡ Next — break, continue & Labels:

📝 Practice Questions:
👉 OCA 8 (1Z0-808): https://javalearn.clustermicro.com — Live now
👉 OCP 21 (1Z0-830): https://javaocp.clustermicro.com — Coming Soon
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Видео Java OCP 21 (1Z0-830) | Controlling Flow | Loops — for, while, do-while, for-each канала Clustermicro Technologies