How treemap handles case of putting key on same index?

I tried out following code: public static void main (String[] args) throws java.lang.Exception { // sorting based on number of dots Map map =new TreeMap((o1, o2) -&…

Why do I get an error when entering child classes to a TreeMap defined for their parent? [closed]

In my program I have an abstract class TelephoneEntry which holds a TelephoneNumber(it implements Comparable) and an addres, then I have child classes Person and Company that extend the …

How to write custom comparator in java?

I want to store key-value pairs in TreeMap and sort the entries based on the value of key as per the following logic: “type” (case insensitive) key should be at first. the key start with &…

Does using an Iterator over a TreeMap in Java interfere with the order of keys?

I want to know that if using an Iterator over a TreeMap in Java interfere with the order of keys?