What's the best way to trim() all elements in a List? [duplicate]

Answer 1

If you are on java-8, you can use :

    final List<Object> result = arrayList.stream()
        .map(String::trim)
        .collect(Collectors.toList());

Answer 2

In Java 8, you should use something like:

List<String> trimmedStrings = 
    originalStrings.stream().map(String::trim).collect(Collectors.toList());

also it is possible to use unary String::trim operator for elements of the initial list (untrimmed String instances will be overwritten) by calling this method:

originalStrings.replaceAll(String::trim);