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The current issue is in posTester(), this line :
if((charTally[pos]<0)){

You may want to relook at how you're making that constructor, take a look at my example and compare the form of my constructor to yours:

//Filename: Class1.java
public class Class1{
public...

I'm going to try and help by asking questions.
First tackle the error message... What does it tell you?
Line 12, can't find a symbol.
Line 12 is:

strObject compstr = new strObject(str1,...