returning to a catch block

[vuthlarhi donald]

how can I return to try statement froma a catch block...catching an Exception and then termionates..

for(int i =0 ;i<=persons.length;i++)            //Iterate through the instances.
{
   
    try{
       
if((k==persons[i].password) && (kc.equals(persons[i].username)) ){ 
  System.out.println("Welcome");
  System.out.println(persons[i]);
     break;                          // break the for loop.
}}
  /**
   * Catch ArrayIndexOutOfBondsException
   * for invalid username or password.
   */
catch(ArrayIndexOutOfBoundsException e){
    System.out.println("Invalid password or Username");//I want to return to the try block from here
    
}}}  

[chinmay s bedarkar]

if you put a "continue" in your catch block, then it should bring you back to the next iteration of for loop.

[Joanne Neal]

An ArrayOutOfBoundsException does not indicate an invalid password - it means you are trying to read outside the bounds of your array. As I told you in your previous post, change

for(int i =0 ;i<=persons.length;i++)

to

for(int i =0 ;i<persons.length;i++)

and you will no longer get the exception

[Joanne Neal]

Actually, thinking about it, an ArrayOutOfBoundsException would indicate an invalid password, because you would have checked the password against all the Person objects in your array and not found a match - it is just not the best way to do it. Of course, if this is the case, there is no need to return to your try statement, because you will have already checked all the possible passwords.

The better way to do it is using a boolean flag.

boolean isValid = false;
for(int i =0 ; (i<persons.length) && !isvalid;i++)
{
  if((k==persons[i].password) && (kc.equals(persons[i].username)) ){
    System.out.println("Welcome");
    System.out.println(persons[i]);     
    isValid = true;
  }
}
if (!isValid) {
  System.out.println("Invalid password or Username");
}

[Campbell Ritchie]

Joanne is quite right; you are setting up the "for" loop wrongly, and the format for "for" loops is a standard part of beginners' Java. In my opinion catching an ArrayIndexOutOfBoundsException means minus 1 mark automatically!

Welcome to the Ranch, Chinmay S Bedarkar. The "continue" is redundant; the loop will repeat after the catch regardless.

[Raghavan Muthu]

Originally posted by vuthlarhi donald:
how can I return to try statement froma a catch block...

To my knowledge, it is NOT possible at all.

As all other ranchers suggested, you can alter your program code so as to resolve the issue!