小编Jai*_*tel的帖子

我目前正在学习Java中的Threads基础知识,我正在尝试编写一个简单的Thread Group程序.虽然我得到了不同类型的输出,但我和教程网站一样写了它.下面是我的代码,我得到不同的输出.

public class ThreadGroupDemo implements Runnable {

    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName());
        // get the name of the current thread.
    }

    public static void main(String[] args) {
        ThreadGroupDemo runnable = new ThreadGroupDemo();
        ThreadGroup tg1 = new ThreadGroup("Parent Group");
        // Creating thread Group.

        Thread t1 = new Thread(tg1, new ThreadGroupDemo(), "one");
        t1.start();
        t1.setPriority(Thread.MAX_PRIORITY);

        Thread t2 = new Thread(tg1, new ThreadGroupDemo(), "second");
        t2.start();
        t2.setPriority(Thread.NORM_PRIORITY);

        Thread t3 = new Thread(tg1, new ThreadGroupDemo(), "Three");
        t3.start();

        System.out.println("Thread Group name : " + tg1.getName()); …

如何使用Javascript更改DropDownList中的默认选定值？

我是JavaScript新手,我坚持在下拉列表中更改默认选择值.在这里,我想将默认选择值"111"更改为新值.它必须改变我输入文本,例如"abc"进入模态和当我点击"确定"按钮.现在它必须显示默认选择("abc")到我从文本框获得的下拉列表模态.并且列表中的旧值也没有改变.

代码片段:

<form>
<select id="myList">
            <option>111</option>
            <option>222</option>
            <option>333</option>
        </select> <br>
        <br> 
</form>
<!-- Trigger/Open The Modal -->
<button id="myBtn">Open Modal</button>

<!-- The Modal -->
<div id="myModal" class="modal">

  <!-- Modal content -->
  <div class="modal-content">
    <span class="close">&times;</span>
    <input type="text" id="addtext" size="50" /><br>
    Write & add text in the Dropdown list..</text>
    <br><br>
    <button id="okBtn">OK</button>

  </div>

</div>

<script>
// Get the modal
var modal = document.getElementById('myModal');

// Get the button that opens the modal
var btn = document.getElementById("myBtn");


// Get the button that …

而不是Stack,Queue也可以用于它.为什么JVM对本地变量使用"Stack"并调用内存管理方法？我已经谷歌我的问题,但没有得到关于它的确切答案.