KwickClips Java · 41 sec · free
Why does my loop variable vanish?
Short answer. Its scope is the loop block, so it disappears when the loop ends.
What is the difference between scope and lifetime?
Scope is where the name works; lifetime is how long the variable exists.
Scope and lifetime
| Variable | Lives until |
|---|---|
| Local | block ends |
| Argument | method ends |
| Instance | object is gone |
| static | program ends |
Remember
| Scope: where a name works |
| Lifetime: how long it lives |
Your loop variable vanished. Here is why. Each has a lifetime. Local ends with its block, like a loop. Arguments end with the method. Instance lives with its object. Static lasts the whole run. Scope is where. Lifetime is how long.
This clip is from the full lesson: Access Specifiers, Encapsulation and Visibility — 5 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 9 Information Technology (402), ICSE Class 9 Computer Applications, ICSE Class 10 Computer Applications, ICSE Class 10 Computer Applications
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