Example #5: Conversion of Collection Hash Set to List using Constructor Here we declare and initialize a set, then create list and get set elements added to list. List stringList = new ArrayList(HashSet.size()) Example #4: Conversion of Collection Set to List, using Plain Java Collections.addAll() method is used to pass lists and array as arguments. Similar to the way in which Array, one of the Collections was converted to List, we shall see How a Set, a Collection will be converted to List. We initialized an empty array and created an empty list. So, here we are using addAll() method of Collection class as the array and the list are both parts of the collection framework. ("Array Before conversion: " + Arrays.toString(stringArr)) Example #2: Conversion of Array collection to a list using asList we shall convert the array to a list similar to how we convert a list to an array. So here we are using one of the Collection frameworks to convert data to a list.Īs the Collection framework includes List, Queue, Set, etc. Example #1: Java Collection to List conversion Let us look at few examples which will give an insight into the conversion of Collections. It enables the Java compiler to check if the user tries to use collection with the correct type of objects. Java Collection must get parameterized with the type declaration. List intVal = values.stream().collect(Collectors.toList()) Here is the syntax used for converting Java Collection to List.
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