This works for certain entries - why?

Question

im trying to find out the largest number/age but it only works for a certain set of data for some reason.
I tested it with ordinary numbers (no objects created) in a seperate program and it works fine but not this one :-/
ConsoleIO.out.println("\n\n\n\n\nPlease enter the employee number you wish to assign a Mentor to: ");
        int pn = ConsoleIO.in.readInt();
        //get this employees prog lang and age
        Iterator iter = theStaff.iterator();
        while(iter.hasNext() == true)
             Programmer programmer = (Programmer)iter.next();
             if(pn == programmer.getPayrollNumber()) //if the pn == payroll number in arraylist
                  ConsoleIO.out.println("They match\n");
                  thisproglang = programmer.getCertainLang(); //get their prog lang
                  thisage = programmer.getAge(); //and age
        //get other employee ages && proglangs
        iter = theStaff.iterator();
        while(iter.hasNext() == true)
             Programmer programmer2 = (Programmer)iter.next();
             getlang = programmer2.getCertainLang(); //get other employees lang
             getage = programmer2.getAge(); //and age
             if(getage > largeage)
                  largeage = getage; //store the largest age in a variable
        if((thisproglang.equals(getlang)) && (largeage == largeage))
                  ConsoleIO.out.println("Eldest Age: " + largeage + "\nLang: " + getlang + "\n\n");
        }if we type in the payrollnumber of an employee who does java - it shows the eldest employee doing that same language - which is great!
but if we do the same thing except for the employee who does VB - nothing shows but there ARE older employees doing the same language (VB) as them
:-/ - whats going on?

Answer 1

what im trying to do is that if the pn is == (equal
to) a pn number in the arrayList then go on further:
get thispn programming language
(programmer.getCertainLang())
and get the age
THEN I want the same thing to happen for all OTHER
objects (or programmers - same thing) and then compare
to see if the object's age is less than the other
objects ageDon't you want to compare the age ONLY IF the programmer is the same language as the first programmer? If you compare the age to all programmers, you will get the oldest programmer, not the oldest programmer of a specific language. Then, if your oldest programmer is not the specified language, nothing will display.
That's why you need to add a check for the same language before you check to see if the programmer is older.
For example, P1 and P2 are Java programmers. P1 has 5 years of experience, P2 has 10 years. P3 and P4 are VB programmers. P3 has 6 years and P4 has 9 years. So running your code with P1's pn will find that P2 is the oldest programmer and since P2 is a Java programmer, your code will show P2. Running with P3's pn will find that P2 is the oldest programmer, but since P3 is VB and P2 is Java, nothing will display.