Two simple implementation methods of array conversion list in Java

Method 1: Use the () method

()Methods can convert an array into a fixed-size List.

public static void main(String[] args) {
    int[] array = {a, b, c, d, e};
    List<Integer> list = (array);
    (list);  // Output: [a, b, c, d, e]}

Note: However, the size of this List is fixed, if you try to add or delete elements, otherwise the program will throw itUnsupportedOperationException. If you need a list that can be modified, you need to convert the returned list to a new ArrayList or other type of list.

Method 2: Use ArrayList constructor

public static void main(String[] args) {
    int[] array = {a, b, c, d, e};
    List<Integer> list = new ArrayList<>((array));
    (list);  // Output: [a, b, c, d, e]    ("f");  // Add elements, no exception is thrown    (list);  // Output: [a, b, c, d, e, f]}

use()Convert the array to a List and then use the ArrayList's constructor to create a new ArrayList. The new ArrayList can be modified, you can add or delete elements.

Attached list to array:

List<String> strList = new ArrayList<String>();
("aa");
("bb");
Object[] objs = ();

If you want to become a String array, you need to force the type to rotate.

String[] strs = (String[]) ();

You can also specify the size:

final int size = ();String[] strs = (String[])(new String[size]);

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