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java Programming Glossary: o1How do I sort a list with multiple sort parameters? http://stackoverflow.com/questions/1421322/how-do-i-sort-a-list-with-multiple-sort-parameters Comparator Person ID_SORT public int compare Person o1 Person o2 return Integer.valueOf o1.getId .compareTo o2.getId.. int compare Person o1 Person o2 return Integer.valueOf o1.getId .compareTo o2.getId NAME_SORT public int compare Person.. .compareTo o2.getId NAME_SORT public int compare Person o1 Person o2 return o1.getFullName .compareTo o2.getFullName ..
whats the difference between “.equals and ==” http://stackoverflow.com/questions/1643067/whats-the-difference-between-equals-and because it is so much for that. so here's an example if o1.equals o2 System.out.println Both integer objects are the same.. objects are the same instead of what i'm used to if o1 o2 System.out.println Both integer objects are the same What's..
Sorting an ArrayList of Contacts based on name? [duplicate] http://stackoverflow.com/questions/1814095/sorting-an-arraylist-of-contacts-based-on-name 1 .toUpperCase field.substring 1 public int compare Object o1 Object o2 try if o1 null o2 null o1 o1.getClass .getMethod.. 1 public int compare Object o1 Object o2 try if o1 null o2 null o1 o1.getClass .getMethod getter new Class 0 .invoke.. int compare Object o1 Object o2 try if o1 null o2 null o1 o1.getClass .getMethod getter new Class 0 .invoke o1 new Object..
Java dynamic binding and method overriding http://stackoverflow.com/questions/321864/java-dynamic-binding-and-method-overriding t1 new Test Object t2 new Test Test t3 new Test Object o1 new Object int count 0 System.out.println count prints 0 t1.equals.. 1 t1.equals t3 System.out.println count prints 2 t3.equals o1 System.out.println count prints 3 t3.equals t3 System.out.println.. result in the overridden method being called. So t3.equals o1 would be the only case that would not print. share improve..
Sort objects in ArrayList by date? http://stackoverflow.com/questions/5927109/sort-objects-in-arraylist-by-date myList new Comparator MyObject public int compare MyObject o1 MyObject o2 return o1.getDateTime .compareTo o2.getDateTime.. MyObject public int compare MyObject o1 MyObject o2 return o1.getDateTime .compareTo o2.getDateTime However the above works.. myList new Comparator MyObject public int compare MyObject o1 MyObject o2 if o1.getDateTime null o2.getDateTime null return..
http://stackoverflow.com/questions/780541/how-to-sort-hash-map new Comparator Person public int compare Person o1 Person o2 return o1.getAge o2.getAge for Person p peopleByAge.. Person public int compare Person o1 Person o2 return o1.getAge o2.getAge for Person p peopleByAge System.out.println..
how to sort Map values by key in Java http://stackoverflow.com/questions/922528/how-to-sort-map-values-by-key-in-java Foo comparator new Comparator Foo public int compare Foo o1 Foo o2 ... SortedSet Foo keys new TreeSet Foo map.keySet comparator..
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