Question

我不明白为什么会失败;

<form action="" method="">

<label>First Name <small>(required)</small></label>
<input name="firstname" type="text" class="form-control" placeholder="Andrew...">

<label>Last Name <small>(required)</small></label>
<input name="lastname" type="text" class="form-control" placeholder="Smith...">

<label>First Name <small>(required)</small></label>
<input name="cus-firstname" type="text" class="form-control" placeholder="John...">

<label>Last Name <small>(required)</small></label>
<input name="cus-lastname" type="text" class="form-control" placeholder="Williams...">

<label>Email <small>(required)</small></label>
<input name="cus-email" type="email" class="form-control" placeholder="John@paradime.com">

<input type="checkbox" name="design" value="design">
<p>The Original</p>

<input type="checkbox" name="design" value="design">
<p>Something Else</p>

<input type="checkbox" name="size" value="Small">
<input type="checkbox" name="size" value="Medium">
<input type="checkbox" name="size" value="Large">
<input type="checkbox" name="size" value="X-Large">
<input type="checkbox" name="size" value="XX-Large">

<label>Text</label><br>
 <select name="quantity" class="form-control">
 <option disabled="" selected="">- Quantity -</option>
 <option value="one"> 1 </option>
 <option value="two"> 2 </option>
 <option value="three"> 3 </option>
 <option value="four"> 4 </option>
 <option value="five"> 5 </option>
 <option value="six"> 6 </option>
 <option value="seven"> 7 </option>
 <option value="eight"> 8 </option>
 <option value="nine"> 9 </option>
 <option value="ten"> 10 </option>
</select>

<input type="text" class="form-control" placeholder="Price" name="price">

<label>Colour</label><br>
 <select name="colour" class="form-control">
    <option disabled="" selected="">- Colour -</option>
    <option value="ANTIQ-CHERRY-RED"> ANTIQ CHERRY RED </option>
    <option value="ANTIQUE-SAPPHIRE"> ANTIQUE SAPPHIRE </option>
 </select>                                                

<input type='button' name='finish' value='Finish'/>

</form>

错误消息：

Map<String, Boolean> iMap = Arrays.asList("1","2","3","4","5").stream()
  .collect(Collectors.toMap(k->k, Boolean.TRUE));

任何帮助表示感谢。

Answer 1

Collectors.toMap()预计两个参数均为Function。您尝试传递Boolean。试试这个：

Collectors.toMap(k->k, k->Boolean.TRUE)

Java的lambda to toMap <string，boolean =“”>

1 个答案: