我不明白为什么会失败;
Map<String, Boolean> iMap = Arrays.asList("1","2","3","4","5").stream()
.collect(Collectors.toMap(k->k, Boolean.TRUE));
错误消息:
Multiple markers at this line
- Type mismatch: cannot convert from T to K
- The method toMap(Function<? super T,? extends K>, Function<? super T,? extends U>)
in the type Collectors is not applicable for the arguments ((<no type> k) -> {}, Boolean)
任何帮助表示赞赏。
Collectors.toMap()
期望这两个参数都Function
。您正在尝试传递Boolean
。试试这个:
Collectors.toMap(k->k, k->Boolean.TRUE)