java - 调用对象方法并使用函数式 api 返回相同的对象

Question

目前我有:

cardLabels = cards.stream()
            .map(ImageSupplier::getCard)
            .map(JLabel::new)
            .collect(toList());

cardLabels.stream().forEach(container::add);

我会写 lambda 表达式:

.map(c ->{ 
  JLabel label = new JLabel(c);
  container.add(label);
  return label;
 })

但是好像很长。有什么我可以调用的东西，比如 .doStuff(container::add) 会返回 JLabel 流吗？

Answer 1

也许您正在寻找peek :

return cards.stream()
            .map(ImageSupplier::getCard)
            .map(JLabel::new)
            .peek(container::add);

Returns a stream consisting of the elements of this stream, additionally performing the provided action on each element as elements are consumed from the resulting stream.

This is an intermediate operation.