How to implement Hash Map?

Question Posted / shobha deepak

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How to implement Hash Map?..

Answer / rice

HashMap is a class that implements Map interface.

HashMap underlined data structure is Hash table.

If we want to describe the group of objects as key ,value
pairs then we go for HashMap class.

key are not duplicated but value can be any thing.

null insertion is possible.

insertion order is not preserved.

HashMap hm=new HashMap();
hm.put(1, "rice");
hm.put(3, "rice");
hm.put(2, "shine");
System.out.println(hm);

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How to implement Hash Map?..

Answer / brijendra-java (xavient)

HashMap is the implementaion of Map interface.
HashMap is key value pair storage concept.
HasMap does not allow duplicate key but value may be any
thing.
HasMap allow both key and Valuea as NULL.
HasMap is the Unordered collection.
When we change the iteration of HasMap then it give
concurrent Modification error.
HasMap is NonSyncronised class.

HashMap hMap = new HashMap();
hMap.put(Null, Null);
hMap.put(1, a);
hMap.put(2, b);
hMap.put(3, c);
system.out.println("Size"+hMap.size());