How to compare generic type objects?

Question

Java

Task: Sort objects by property with custom annotation Stuck
while comparing two objects, can't get property value with field.get(obj) nor use compareTo() because they don't work with generics. types.
PS If this task is solved only by using some interface, please advise where you can read about it

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;

public class ASort<T>{

  public void SortByAnatation(ArrayList<T> tList) {
    
    Field[] fields = tList.get(0)
        .getClass()
        .getFields();
    Field anotatedF = null;
    for (Field field : fields) {
      if(field.isAnnotationPresent(SortAnatation.class)) {
        anotatedF = field;
        break;
      }
    }
    if(anotatedF == null) {
      System.out.println("Not anotated!");
      return;
    }
         
        boolean isSorted = false;
        T buf;
        for(;!isSorted;) {
            isSorted = true;
            for (int i = 0; i < tList.size()-1; i++) {
                if(compareBy(tList.get(i), tList.get(i+1), anotatedF) == 1){
                    isSorted = false;
 
                    buf = tList.get(i);
                    tList.set(i, tList.get(i + 1));
                    tList.set(i+1, buf);
                }
            }
        }
    
  }

  public int compareBy(T o1, T o2, Field compareF) {
    
    Class<?>  fType = compareF.getType();
    
    if(fType==Byte.class||fType==Character.class||fType==Long.class||fType==Integer.class
        ||fType==String.class||fType==Double.class||fType==Boolean.class) {
      return (compareF.get(o1)).compareTo(compareF.get(o2));  // Не компилируется,
                         //оставил для примера
    }
    
  }
}
<code lang="java">