Assert statements

[Neha Daga]

 
int i=9;
 public void myMethod1(int x) {
 assert (x > 0);//line1
 switch(x) {
 case 2: x = 3;
 default: assert false; //line2} }
 
 private void myMethod2() { assert (myMethod3());//line3 }
 private boolean myMethod3() { i = 6; return false; }
   

which assert statements are used appropriately?
the answer is line2.

my question is why assert statement on line1 is not appropriate?

[Wouter Oet]

Because it is validating an argument of a public method

[Neha Daga]

thanks

[Raju Champaklal]

because x is the parameter of a public method and it is inappropriate to check them.....because after all it is public method which can be accessed by any client....and the client doesnt know if there were supposed by a check on the argument passed to the method...

[dimple bav]

Neha Daga wrote:

 
int i=9;
 public void myMethod1(int x) {
 assert (x > 0);//line1
 switch(x) {
 case 2: x = 3;
 default: assert false; //line2} }
 
 private void myMethod2() { assert (myMethod3());//line3 }
 private boolean myMethod3() { i = 6; return false; }
   

which assert statements are used appropriately?
the answer is line2.

my question is why assert statement on line1 is not appropriate?

----------------------------------------------
Its a rule that assertions should not be use to check the arguments passed to a public method

To know the reasons you can check SCJP5-Paul Sanghera CHP 7(pg 190).

I would like to know how assertions work with private methods ?