Assertion question

[Shiva Mohan]

    
class B {
  private static int x1;
  public void setX(int x) {x1 = x;}
  public int getX() {return x1;}
  public static void main(String[] args) {
    int i1 = 0, j1 = 0;
    do {
      System.out.print(j1++);
      assert (i1 = j1 + x1) < 6;
    } while (i1 < 3);
}}

Assuming that the setX method is never invoked, which statements are true?
a. With assertions enabled it prints 012345 followed by an AssertionError message.
b. With assertions enabled it prints 012.
c. With assertions disabled it prints: 012345
d. With assertions disabled it prints: 012
e. With assertions disabled it attempts to print an infinite sequence of numbers.
f. With assertions disabled the variable i1 is incremented with each pass through the loop.
g. As a rule, the boolean expression of an assert statement should not be used to perform actions that are required for normal operation of the program.
B,e,g are correct.
But my ananlysis says b and d are correct.

Can anyone please explain e an g options for me.(step by step if possible)

[Naseem Khan]

With assertion disabled, the assert line will not be executed so i1 will not be incremented by 1. This will make do-while loop run infinite times. So option e is correct.

Option b is correct wen assertion is enabled.

[Pramila Chinguru]

With Assertions disabled, assert (i1 = j1 + x1) < 6 is just ignored at run time, so it is equivalent to commenting that line.

do {
System.out.print(j1++);
// assert (i1 = j1 + x1) < 6;
} while (i1 < 3);}}
In this code, i1 is never modified, so while condition is always true and it loops infinite times.

option g is also correct since, assertions might be disabled at runtime, hence it should not include any code that must be performed in a normal execution.

[Shiva Mohan]

Thank you very much naseem and pramila.I got it on your help.

[Shiva Mohan]

Pramila! i have a question for you.Have you formed any study group of SCJP1.4 preparation.