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After adding all of the elements, call the trimToSize() method

public  void trimToSize() The trimToSize() method makes sure that there is no unused space in the internal data structure. import java.util.ArrayList; public class MainClass {   public static void main(String[] a) {     ArrayList list = new ArrayList();     list.add("A");     list.ensureCapacity(10);     list.trimToSize();   } }