Creating a list with repeating element

Question

Is there an utility method in Java that generates a list or array of a specified length with all elements equal to a specified value (e.g [\"foo\", \"foo\", \"foo\", \"foo\"

Answer 1

For an array you can use Arrays.fill(Object[] a, Object val)

String[] strArray = new String[10];
Arrays.fill(strArray, "foo");

and if you need a list, just use

List asList = Arrays.asList(strArray);

Then I have to use two lines: String[] strArray = new String[5]; Arrays.fill(strArray, "foo");. Is there a one-line solution?

You can use Collections.nCopies(5, "foo") as a one-line solution to get a list :

List strArray = Collections.nCopies(5, "foo");

or combine it with toArray to get an array.

String[] strArray = Collections.nCopies(5, "foo").toArray(new String[5]);