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1Z0-811 Java Basics and Syntax Practice Question

Which assignment requires an explicit cast to compile?

⚠ Common exam trap

Oracle often tests the misconception that any numeric literal with a suffix (like `L` or `f`) automatically requires a cast, but the trap here is that only narrowing conversions (e.g., `long` to `int`) need explicit casting, not widening ones or assignments of the same type.

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

int i = 10L;

Requires an explicit cast because it assigns a `long` literal (10L) to an `int` variable. In Java, `long` is a 64-bit type and `int` is 32-bit, so this is a narrowing primitive conversion that loses precision and must be explicitly cast with `(int)`. Without the cast, the compiler rejects it as a possible lossy conversion.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
int i = 10L;
Why this is correct
Correct. long to int needs explicit cast.
✗
double d = 10;
Why it's wrong here
Incorrect. int to double is widening, no cast needed.
✗
long l = 10;
Why it's wrong here
Incorrect. int to long is widening, no cast needed.
✗
float f = 10.5f;
Why it's wrong here
Incorrect. float literal, no cast needed.

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1Z0-811 Java Basics and Syntax Practice Question

Why each option matters

Option-by-option breakdown

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