You want to create a REST endpoint to get details of a book by its category and ISBN. Which method signature correctly uses @PathVariable for this URL pattern: /books/{category}/{isbn}?
hard📝 Application Q8 of 15
Spring Boot - REST Controllers
You want to create a REST endpoint to get details of a book by its category and ISBN. Which method signature correctly uses @PathVariable for this URL pattern: /books/{category}/{isbn}?
URI has {category} and {isbn}, so method must have two parameters annotated with @PathVariable for both.
Step 2: Use explicit names if parameter names differ
public String getBook(@PathVariable("category") String cat, @PathVariable("isbn") String id) uses @PathVariable("category") and @PathVariable("isbn") with different parameter names, which is valid.
Step 3: Check types and completeness
public String getBook(@PathVariable String cat, @PathVariable String isbn) has parameter names that do not match URI variables (cat != category); public String getBook(@PathVariable int category, @PathVariable String isbn) wrongly uses int for category; public String getBook(@PathVariable String category, String isbn) misses @PathVariable on isbn.
Final Answer:
public String getBook(@PathVariable("category") String cat, @PathVariable("isbn") String id) -> Option A
Quick Check:
Explicit names allow different parameter names [OK]
Quick Trick:Use @PathVariable("name") if parameter name differs [OK]
Common Mistakes:
Using wrong types for path variables
Omitting @PathVariable on parameters
Not matching URI variable names
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