Question

这是一个奇怪的情况。我删除了一个框架的内容并添加了新的内容但旧内容正在被添加两次。为什么会发生这种情况？这可能看起来像很长的代码，但大部分都是为帧生成内容正如我从 addUserFrame（）的 ActionListener 中调用 manager（） 函数时所看到的那个问题开始/ em> 功能。

public class adminManager { private static Connection con; private static Statement stmt; private static JFrame f; private static JPanel p = new JPanel(); private static JButton addUser,exitTest,addTest,editTest; public static void manager(JFrame frame) { f=frame;f.setSize(400,800); p.setLayout(new BoxLayout(p, BoxLayout.Y_AXIS)); Dimension d = new Dimension(100,30); addUser = new JButton("ADD USER"); exitTest = new JButton("EXIT"); addTest = new JButton("ADD TEST"); editTest = new JButton("EDIT TEST"); p.add(addUser);p.add(addTest); p.add(editTest);p.add(exitTest); f.setTitle("Select Option"); f.setLayout(new FlowLayout()); f.add(p); f.setVisible(true); f.setResizable(false); f.setLocationRelativeTo(null); f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); bindEvents(); } public static void addUserFrame(JFrame f) { JPanel p1 = new JPanel(); JPanel p2 = new JPanel(); JPanel p3 = new JPanel();J Panel parentPanel = new JPanel(); JLabel l1 = new JLabel("Enter User-Name"); JLabel l2 = new JLabel("Enter Password"); JTextField t1 = new JTextField(10); JTextField t2 = new JTextField(10); JButton btn = new JButton("Submit"); JButton back = new JButton("Go Back"); p1.setLayout(new FlowLayout(FlowLayout.CENTER)); p2.setLayout(new FlowLayout(FlowLayout.CENTER)); p3.setLayout(new FlowLayout(FlowLayout.CENTER)); parentPanel.setLayout(new BoxLayout(parentPanel,BoxLayout.Y_AXIS)); p1.setSize(200,100); p2.setSize(200,100); p3.setSize(200,100); p1.add(l1);p1.add(t1); p2.add(l2);p2.add(t2); p3.add(btn);p3.add(back); parentPanel.add(p1);parentPanel.add(p2);parentPanel.add(p3); f.add(parentPanel); back.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ f.getContentPane().removeAll();f.repaint(); manager(f); } }); } public static void bindEvents(){ addUser.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ f.getContentPane().removeAll(); f.repaint(); addUserFrame(f); f.setSize(400, 150); f.setTitle("Add User"); f.setVisible(true); } }); } public static void main(String []args){ manager(new JFrame()); } }

更新

通过将p=new JPanel()移至manager()方法
来解决问题

Answer 1

<%@ page language="java" session="true" contentType="text/html;charset=UTF-8" %>

<%@ taglib uri="/tags/struts-html" prefix="html" %>
<%@ taglib uri="/tags/struts-bean" prefix="bean" %>
<%@ taglib uri="/tags/struts-bean" prefix="logic" %>
<%@ taglib uri="/tags/jstl-c" prefix="c" %>
<%@ taglib uri="/tags/widgets" prefix="widget" %>
<%@ taglib uri="/tags/jstl-fmt" prefix="fmt" %>

<fmt:setBundle basename="resources/application" var="kanisa" />

<html>
<head>
    <title><bean:message key='label.common.title'/></title>
    <meta http-equiv="content-type" content="text/html;charset=UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE10">
    <META HTTP-EQUIV="Pragma" CONTENT="no-cache">
    <META HTTP-EQUIV="Cache-Control" CONTENT="no-cache">
    <META HTTP-EQUIV="Cache-Control" CONTENT="no-store">
    <META HTTP-EQUIV="Expires" CONTENT="Now">
    <META HTTP-EQUIV="Expires" CONTENT="-1">
    <link href="../css/knova.css" type="text/css" rel="stylesheet">
</head>
<body style="width: 380px; margin: 0px;">   
    <widget:search action="microsite.do" template="GS.vm"
                   showBrowseArea="none" showSearchWithin="false" showNavigationArea="false" showSynopsis="Title" hideDocType="true" 
                   widgetName="dd_home" widgetTitle="searchwidget.hotTopics"
                   UMFilterUMType="DT_DocType"  showUMFilter="true"  searchDocuments="KSM,Authored,Threaded"
                   sortDDL="newest,popular" sortCriteria="newest" numChar="100"
                   numDocsPerPage="5" useMSPreferences="true" />
</body>
</html>

您从框架中删除了面板f.getContentPane().removeAll();，但在方法p中添加了添加新元素的manager()。您必须在p上致电clear()或创建新的小组p

Answer 2

问题是正在使用相同的JPanel 通过将p=new JPanel()移动到manager()方法

来解决此问题

为什么没有清除jframe？

2 个答案: