public class Test2 { public static int x; public static int foo( int y) { return

Question

 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?

A. Line 11 B. Line 12 C. Line 14 D. Line 22

  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?

A. Line 11 B. Line 12 C. Line 14 D. Line 22

Explanation / Answer

Option D

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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