examples of Hash map in java programming

Hash Map:

Unordered and unsorted map.
Hashmap is a good choice when we don’t care about the order.
It allows one null key and multiple null values.

Example:

Public class Fruit{
Public static void main(String[ ] args){
HashMap&lt;Sting,String&gt; names =new HashMap&lt;String,String&gt;( );
names.put(“key1”,“cherry”);
names.put (“key2”,“banana”);
names.put (“key3”,“apple”);
names.put (“key4”,“kiwi”);
names.put (“key1”,“cherry”);
System.out.println(names);
}
 }

Output:

{key2 =banana, key1=cherry, key4 =kiwi, key3= apple}

Duplicate keys are not allowed in Map.

It doesn’t maintain any insertion order and is unsorted.

examples of Hash map in java programming

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