Consider the Following Example<\/p>\n
\r\n Collection<Integer> coll = new ArrayList<Integer>();\r\n\r\n coll.addAll(Arrays.asList(1,2,3,4,5));\r\n<\/pre>\nIn the above addAll the addition takes place in following steps as Below
\n1.varargs+autoboxing creates Integer[]
\n2.Arrays.asList creates a Listbacked by the array
\n3.addAll iterates over a Collectionusing Iterator <\/p>\n Now consider the Below Code<\/p>\n
\r\n Collection<Integer> coll = new ArrayList<Integer>();\r\n\r\n coll.addAll(coll, 1,2,3,4,5);\r\n<\/pre>\n1.varargs+autoboxing creates Integer[]
\n2.addAll iterates over an array (instead of an Iterable)<\/p>\n We can see now that b) may be faster because:<\/p>\n
Arrays.asList call is skipped, i.e. no intermediary List is created.
\nSince the elements are given in an array, iterating over them may be faster than using Iterator.<\/p>\n","protected":false},"excerpt":{"rendered":"Consider the Following Example Collection<Integer> coll = new ArrayList<Integer>(); coll.addAll(Arrays.asList(1,2,3,4,5)); In the above addAll the addition takes place in following steps as Below 1.varargs+autoboxing creates Integer[] 2.Arrays.asList creates a List backed by the array 3.addAll iterates over a Collection using Iterator Now consider the Below Code Collection<Integer> coll = new ArrayList<Integer>(); coll.addAll(coll, 1,2,3,4,5); 1.varargs+autoboxing creates… Continue reading