Java Data Type - 如何替换列表中每个字符串中的字符

import java.util.Arrays;
import java.util.List;

public class Main {
  public static void main(String[] args) {
    List<String> stringList = Arrays.asList(args);
    System.out.println("before: " + stringList);
    for (int i = 0; i < stringList.size(); ++i) {
      stringList.set(i, stringList.get(i).replaceAll("\\s+", ""));
    }
    System.out.println("after : " + stringList);
  }
}