JTextField中没有输出

时间:2016-12-18 08:24:56

标签: java swing calculator textfield

这是我第一次在JAVA中编程GUI。我正在为我的项目尝试转换器程序,但是当我尝试运行程序时,我没有得到任何输出。我的代码还没有完成。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>VideoOrganiser</title>

    <!-- Latest compiled and minified CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

    <!-- Optional theme -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css" integrity="sha384-rHyoN1iRsVXV4nD0JutlnGaslCJuC7uwjduW9SVrLvRYooPp2bWYgmgJQIXwl/Sp" crossorigin="anonymous">

    <!-- Latest compiled and minified JavaScript -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
    {% load static %}

    <link href="{% static 'mfo/base_style.css' %}" rel="stylesheet" type="text/css">
    <script src="{% static 'scripts/index.js' %}" type="text/javascript"></script>
    <script src="{% static 'scripts/bootstrap-uploadprogress.js' %}" type="text/javascript"> </script>

</head>
<body data-spy="spyscroll">
<nav class="navbar navbar-custom">
    <div class="container-fluid">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">
            <button type="button" class="navbar-toggle" data-toggle="collapse"
                    data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
        </div>

        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
            <ul class="nav navbar-nav">
                <li><a href="/" style="font-size: 200%">VideoOrganiser</a></li>
            </ul>
            <ul class="nav navbar-nav navbar-right">
                <li style="padding-top: 11px">
                    <!-- Trigger the modal with a button -->
                    <button type="button" class="btn btn-primary" data-toggle="modal" data-target="#myModal">Upload Media</button>
                </li>
            </ul>
        </div><!-- /.navbar-collapse -->
    </div><!-- /.container-fluid -->
</nav>

<!-- Modal -->
<div id="myModal" class="modal fade" role="dialog">
    <div class="modal-dialog">

        <!-- Modal content-->
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal">&times;</button>
          <h4 class="modal-title">Upload Media</h4>
      </div>
        <div class="modal-body">
            <form id="upload_form" enctype="multipart/form-data" action="" method="post">
                {% csrf_token %}
                {{ upload_form }}
                <input type="submit" id="upload_submit" style="margin-top: 10px" class="btn btn-default" value="Upload" />
            </form>
            <script>
                $("#upload_form").uploadprogress({redirect_url: "/"})
            </script>
        </div>
        <div class="modal-footer">
            <button type="submit" class="btn btn-default" data-dismiss="modal">Close</button>
        </div>
    </div>

    </div>
</div>

<div class="container-fluid">
    <div class="jumbotron" id="file_system_jumbo"></div>
</div>

3 个答案:

答案 0 :(得分:1)

private JTextField txtEnterText;

您未在txtEnterText中设置任何文字,这就是您的JTextField为空的原因。您需要在JTextField txtEnterText

中设置文字

示例:

txtEnterText.setText("SOME TEXT");

答案 1 :(得分:1)

  

但是当我尝试运行程序

时,我没有得到任何输出
        String EnterNumber = txtDisplay.getText() + btn0.getText();
        txtDisplay.setText(EnterNumber);

根据上面的代码,您尝试将文本添加到JTextArea,但是您永远不会将JTextArea添加到框架中,因此您永远不会看到输出。

因此,解决方案似乎是将文本区域添加到框架中,并删除您从未使用过的文本字段。

上述代码的其他问题:

  1. 变量名称不应以大写字母开头。你的大多数变量是正确的。保持一致!!!

  2. 要将文字添加到文字区域,您只需使用append(...)方法即可。

  3. 类似的东西:

    txtDisplay.append(enterNumber);
    

答案 2 :(得分:0)

你不是txtDisplay,对吧?你在每个事件处理程序中都是txtEnterText。运行它并查看正确显示的数字。