HashMap

Question 1

1. What are the classes we have in map interface?
2. What will happen if i give same key , value pair again in hashmap?
   3.What will happen if i give same key , different value pair again in hashmap?
3. Does HashMap follows insertion Order ?
4. If i insert Key value with New key and same value what will happen?
5. To get the records we can use key value ?

Answer 1

1. HashMap, LinkedHashMap,
   Legacy Class: HashTable, properties
   Map - SortedMap, TreeMap, Navigable Map
2. It won’t change anything, it remains unchanged.
3. it will change the value
4. No , there is no insertion order for HAshMap.
5. It will add a new record key map in the heap memory
6. Yes key should be used bcoz value can have duplicate so

hm.get(10);