An exercise about Assertion

Here's an exercise about Assertion:

In the following code, which lines do not use assertions appropriately?

class AssertDemo{

publicstatic Boolean message(){

System.out.println("Error!!");

returnnew Boolean("true");

}

publicstaticvoid main(String[] args){

boolean b =false;//line 11

assert b : message();//line 13

int x = -5;

assert (x+1)>0;//line 14

assert x>0 : (x = x *-1);//line 15

while(true){

System.out.println(x);

assert x-- >0;//line 19

}

}

}

Select multiple options:

A line 11

B line 13

C line 14

D line 15

E line 19

What would be your answers?

[1705 byte] By [blutch009a] at [2007-11-27 8:01:53]