Can we convert ArrayList to map in Java?
In this post, we will see how to convert HashMap to ArrayList in java. Many times, you need to store keys or values into ArrayList or Store HashMaps Node objects in ArrayList. Show
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Here are the ways to convert HashMap to ArrayList in java. Using Java 8s Stream APIJava 8: Convert HashMaps keys to ArrayListWe can use HashMaps keyset() method to get a set of keys and use Java 8s Stream API to convert it to ArrayList. Java
Convert HashMaps values to ArrayListWe can use HashMaps values() method to get a collection of values and use Java 8s Stream API to convert it to ArrayList.
Convert HashMaps Entry objects to ArrayListWe can use HashMaps entrySet() method to get set of Entry object and use Java 8s Stream API to convert it to ArrayList.
Lets see the complete example. HashMapToArrayListMainJava8.java
Output: customerIds: [1001, 1002, 1003, 1004] Customer Names: [Arman, Javin, Mat, Joe] Customer ID and Names: [1001=Arman, 1002=Javin, 1003=Mat, 1004=Joe] Using ArrayLists constructorConvert HashMaps keys to ArrayListGet keySet() from HashMap and then convert it to ArrayList using its constructor.
Convert HashMaps values to ArrayListGet values()from HashMap and then convert it to ArrayList using its constructor.
Convert HashMaps Entry objects to ArrayListGet entrySet() from HashMap and then convert it to ArrayList using its constructor.
Java HashMap tutorial
Thats all about How to convert HashMap to ArrayList. import_contacts You may also like:How to remove element from Arraylist in java while iteratingPrint HashMap in JavaPrint LinkedList in javaJava Set to ArrayPrint ArrayList in JavaHow to Deep Copy Arraylist in JavaInitialize ArrayList with values in JavaPriorityQueue in Java 82d Arraylist java exampleHow HashMap works in java
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