小编Pav*_*nik的帖子

我可以在varArgs上使用forEach()或stream()吗？

   protected void getSomeIds (List<String>... varArgs) {
     for(List lst:varArgs) {
     System.out.println("This works");
    }
   //Following does not compile 
    varArgs.forEach();
   // nor 
    varArgs.stream();
   }

如何String从Optional<String>usingifPresent和 avoid返回值NullPointerException？

例子：

public String longestName() {
    Optional<String> longName = someList.stream().reduce((name1, name2) -> name1.length() > name2.length() ? name1 : name2);

    // If I do not want to use following
    // return longName.isPresent() ? longName.get() : "not present";

    // Can I achieve this using longName.ifPresent or longName.orElse("not present");
}