Why do I get method does not exist or incorrect signature error using comparable interface?

Question

I am attempting to sort a list based on user clicking columns on visualforce page. Seems like the comparable interface is the best way to do this.

I can sort using static variables but it's messy. I would like to have dynamic variable to compare the list elements; however, I am receiving an error -- "Method does not exist or incorrect signature." Any help is greatly appreciated.

This works but I will need many more if else conditions, one for each column. Plus a check to see what column the user clicked.

if(Load.origincity > Loadtocomp.load.origincity)  
          return SortOrder.equals('asc') ? 1 : 0;  
        else  
          return sortOrder.equals('asc') ? 0 : 1;

This way is much cleaner but it's not working.

if((string)Load.get(comparefield) > (string)Loadtocomp.load.get(comparefield))  
          return SortOrder.equals('asc') ? 1 : 0;  
        else  
          return sortOrder.equals('asc') ? 0 : 1;

This is full comparable interface class (with error)::::

public class loadsort implements Comparable  
    {  
      public parseUtility.load load {get; set;}   

      public loadsort(parseutility.load ld)  
      {  
        load = ld;  
      }  

      public Integer compareTo(Object vLoad)  
      {  
        loadsort LoadToComp = (loadsort )vLoad;  

        if((string)Load.get(comparefield) > (string)Loadtocomp.load.get(comparefield))  
          return SortOrder.equals('asc') ? 1 : 0;  
        else  
          return sortOrder.equals('asc') ? 0 : 1;  
      }  
    }  

This is the error:::::: Method does not exist or incorrect signature: [ParseUtility.load].get(String)

Answer 1

The problem was I didn't have an instance method in my parseutiiity class. I just needed to pass the argument into the method and return a value based on some condition.

   public String get(String arg) {
      if (arg == 'age') {
        return age;
      }
      if (arg == 'companyName') {
        return companyName;
      }
}