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Initialization of ArrayList source code analysis Programmer Sought . This article provides two optimized solutions to the arraylist.removeall speed, but. The removeall () method is present in java.util.arraylist class. C Tutorial C ArrayList LastIndexOf(Object) from www.java2s.com The runtime type of the returned array is that of the. The removeall() method of java arraylist class removes all the elements from a list that are contained in the specified collection. Before we look in to more details, let’s look at the clear () method syntax from the arraylist.the arraylist clear () method will iterate through.