Multiple choice

public class Test2 { public static int x; public static int foo(int y) { return y * 2; } public static void main(String [] args) { int z = 5; assert z > 0; /* Line 11 / assert z > 2: foo(z); / Line 12 / if ( z < 7 ) assert z > 4; / Line 14 */

switch (z) { case 4: System.out.println("4 "); case 5: System.out.println("5 "); default: assert z < 10; }

if ( z < 10 ) assert z > 4: z++; /* Line 22 */ System.out.println(z); } } which line is an example of an inappropriate use of assertions?

  1. Line 11

  2. Line 12

  3. Line 14

  4. Line 22
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Assert statements should not cause side effects. Line 22 changes the value of z if the assert statement is false. Option A is fine; a second expression in an assert statement is not required. Option B is fine because it is perfectly acceptable to call a method with the second expression of an assert statement. Option C is fine because it is proper to call an assert statement conditionally.

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