Java函数式编程如何把String返回给Supplier＜String＞?

缘由解决方法参考

开发项目时，使用方法如下static void play(String target, Supplier readGuess, Display display)，其第二个参数为method，方法体内使用readGuess.get()调用第二个parameter从而获取值。

static void play(String target, Supplier readGuess, Display display) {
  // do something	
  var guess = readGuess.get();
  // do something 
}

需要的返回类型是Supplier, 而我返回的是String，怎么办呢？

public Supplier readGuess() {
  waitForGuessButtonPressedLatch = new CountDownLatch(1);

  try {
    waitForGuessButtonPressedLatch.await();
  } catch (InterruptedException ignored) {}

  String guess = guessWord.toString();
  
  return guess.isEmpty() ? "" : guess;
}

直接把return string换成 return lambda expression即可。

public Supplier readGuess() {
  waitForGuessButtonPressedLatch = new CountDownLatch(1);

  try {
    waitForGuessButtonPressedLatch.await();
  } catch (InterruptedException ignored) {}

  String guess = guessWord.toString();
  
  //return guess.isEmpty() ? "" : guess;
  return () -> guess;
}

https://javabydeveloper.com/java-8-supplier-functional-interface-with-examples/