Java midterm · 52 practice questions

Compiler executes line by line, interpreter whole program?

⬜ True

⬜ False

❌ False (opposite)

Logic errors easier than syntax errors?

⬜ True

⬜ False

❌ False — syntax caught by compiler.

String s="Java"; char c=s.charAt(5);

⬜ 'a'

⬜ runtime error

⏺ Runtime exception (index out of bounds)

Java features? (multiple)

⬜ simple

⬜ WORA

⬜ Windows only

✅ simple, WORA (not windows-only)

Invalid identifiers?

⬜ 123data

⬜ amount-

⬜ $amount

❌ 123data, amount- are invalid.

Java keywords?

⬜ switch

⬜ double

⬜ class

🔑 switch, double, class

int i=1; while(i<3){ i++; }

🖨️ prints 1 2 (no 3)

If x=3, from if/else?

z is 9

If x=1 from same code

y is 3

Q10

x=5; x>2 && x<10

true

Q11

"Java Code".indexOf("Code")

Q12

"Hello".charAt(2)

'l' (third char)

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