JAVA

java array to arraylist

List<Element> list = Arrays.asList(array);

java arraylist to array

List<String> list = new ArrayList<>();
list.add("a");
list.add("ab");
list.add("abc");
list.add("abcd");
// convert
String[] array = list.toArray();

arraylist to array java

ArrayList<String> ArrayLister=new ArrayList<>(){ArrayLister.add("Hi")};
String[] array=ArrayLister.toArray(String[]);

array to arraylist java

ArrayList<Integer> list = new ArrayList<>(OtherList);
//it will copy all elements from OtherList to this one
//time complexity - O(n)

arraylist to java

You can only use the to array method if you convert to any object type.