The best way I know to solve that is (modifications are marked with
a '*':

> public  void MyInt(){
*boolean continue = true; //Control variable
*while(continue){ //evaluate
> try{
> int1 = Integer.parseInt(JOptionPane.showInputDialog("type the
1
> number"));
> int2 = Integer.parseInt(JOptionPane.showInputDialog("type the
2
> number"));
> int3 = Integer.parseInt(JOptionPane.showInputDialog("type the
3
> number"));
> y = "";}
* continue = false; //if no problem was detected
> catch(java.lang.NumberFormatException x){
* continue = true; //if a problem was detected, making possible
* another cicle
> JOptionPane.showMessageDialog(null, "you have to make an
entry");}
> }

I still can't isolate the Exception to the line  of code  that caused
it. I dont want to put  in 1000's of While/Catch statements  when I
have many variables. Is there some way to get the Catch back  to the
line that caused without 1000's of While/Catch statements?

Sometimes your code  may warrant lots of try/catch blocks. But when
that does happen, you should re-examine your design to see if perhaps
you are coding procedurally instead of objectly (is that a word?)

In this case, you might try the exception's toString() method to see
if it will give you enough detail to tease out the line  number. That
will work for a school project.

In this case, you might set up a loop:
While(...) {
try {
for (int i=1;i<4;i++) {
intV = Integer.parseInt(JOptionPane.showInputDialog("type the " + i
+ " number"));}
} catch  (Exception e) { examine value of i to determine which one
failed}
} // end while

a19859 suggests using a boolean variable. You could add that advice
into this advice and have strong control over the inputs.

There are several other ways to handle this issue, but the general
idea is to merge your design with suggestions to arrive at a solution.

The best way to handle this is not to use a try/catch block, but to
get the text from the JoptionPane and determine if it is null BEFORE
you parse the int... Otherwise you will have to put  a try/catch on
each call.

You could also create an array of int[] and loop through the

for(int i=0; i<numberOfIntegers; i++){
try{
int[i] = Integer.parseInt(JOptionPane.showInputDialog("type the
number"));
}
catch(NumberFormatException e){
JOptionPane.showMessageDialog(null, "you have to make an entry");}
i = i-1;
}
}

You could have an array of Strings which would give you a different
message for each loop... etc etc...

That way, you don't have to have 1000's of try/catches, and you
ALWAYS know which input failed.