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Access HashMap Elements

  1. entrySet() - returns a set of all the key/value mapping of the map
  2. keySet() - returns a set of all the keys of the map
  3. values() - returns a set of all the values of the map


\begin{lstlisting} import java.util.HashMap; class Main { public static void ma... ... () System.out.println(''Values : '' + numbers.values()); } } \end{lstlisting}

Output


\begin{lstlisting} HashMap : { One =1 , Two =2 , Three =3} Key / Value mappings ... ...=2 , Three =3] Keys : [ One , Two , Three ] Values : [1 , 2, 3] \end{lstlisting}

Using get() and getOrDefault().

  1. get() - Returns the value associated with the specified key. Returns null if the key is not found.
  2. getOrDefault() - Returns the value associated with the specified key. Returns the specified default value if the key is not found.


\begin{lstlisting} import java.util.HashMap; class Main { public static void ma... ... 5); System.out.println(''Returned Number : '' + value2); } } \end{lstlisting}

Output


\begin{lstlisting} HashMap : { One =1 , Two =2 , Three =3} Returned Number : 3 Returned Number : 5 \end{lstlisting}