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Insert Elements to HashMap

  1. put() - inserts the specified key/value mapping to the map.
  2. putAll() - inserts all the entries from specified map to this map
  3. putIfAbsent() - inserts the specified key/value mapping to the map if the specified key is not present in the map


\begin{lstlisting} import java . util . HashMap ; \par class Main { public stat... ... System.out.println(''HashMap of numbers : '' + numbers); } } \end{lstlisting}

Output


\begin{lstlisting} HashMap of even numbers : { Six =6 , Four =4 , Two =2} HashMap of numbers : { Six =6 , One =1 , Four =4 , Two =2} \end{lstlisting}