Applet中的NullPointerException [英] NullPointerException in Applet
问题描述
大家好,
提前致谢我是Java新手。目前我有两个java文件,一个是applet。当我尝试预览小程序时,我收到如下错误:
java.lang.NullPointerException
at java.util.Hashtable.put(Unknown Source )
在javax.swing.JEditorPane.registerEditorKitForConten tType(未知来源)
在javax.swing.JEditorPane.registerEditorKitForConten tType(未知来源)
在javax.swing.JEditorPane.loadDefaultKitsIfNecessary(未知来源)
在javax.swing.JEditorPane.getKitTypeRegistry(未知来源)
在javax.swing.JEditorPane.getEditorKitClassNameForCo ntentType (未知来源)
在javax.swing.JTextPane。< init>(未知来源)
我做错了什么?请帮助我伙计们......谢谢
你能展示一些(相关的)代码吗?顺便说一下,我把你的话题发表了标题
更多的东西。
亲切的问候,
Jos
因为您指向没有密钥的哈希表?
检查使用该哈希表的代码...
大家好,
谢谢Josah。嗯,你是什么意思哈希表?我不明白..Sorry.btw这是我的代码,调用JTextPane
代码:
private JTextArea textArea = null;
private JTextPane resultArea = null;
private JComboBox langBox = null;
私人地图< Language,ConfigurationDialog> configDialogs = new HashMap< Language,ConfigurationDialog>();
public void createAndShowGUI(String inputText){
JFrame frame = new JFrame(" Test");
frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOS E);
textArea = new JTextArea(inputText);
// TODO:错误行对于自动换行的行显示数字:
textArea.setLineWrap(true);
textArea.setWrapStyleWord(true);
resultArea = new JTextPane();
resultArea.setContentType(" text / html");
resultArea.setText(" Results will here here");
JLabel label = new JLabel(请键入或粘贴文本以检查顶部区域);
JButton button = new JButton(" Check text) ;
button.setMnemonic(''c'');
button.addActionListener(this);
Hi all,
Thanks in advance. I am new at Java. Currently I''m having two java files one is applet. when i try to preview the applet i get an error like this :
java.lang.NullPointerException
at java.util.Hashtable.put(Unknown Source)
at javax.swing.JEditorPane.registerEditorKitForConten tType(Unknown Source)
at javax.swing.JEditorPane.registerEditorKitForConten tType(Unknown Source)
at javax.swing.JEditorPane.loadDefaultKitsIfNecessary (Unknown Source)
at javax.swing.JEditorPane.getKitTypeRegistry(Unknown Source)
at javax.swing.JEditorPane.getEditorKitClassNameForCo ntentType(Unknown Source)
at javax.swing.JTextPane.<init>(Unknown Source)
what i''m doing wrong?pls help me guys...thanks
Can you show a bit of (relevant) code please? btw, I changed your topic titile
to something more to the point.
kind regards,
Jos
because you pointed to hashtable that doesn''t have the key ?
check your code that use that hashtable ...
Hi all,
Thanks Josah. Erm, what do you mean by hashtable nick?I don''t understand..Sorry.btw this is my code that call JTextPane
code :
private JTextArea textArea = null;
private JTextPane resultArea = null;
private JComboBox langBox = null;
private Map<Language, ConfigurationDialog> configDialogs = new HashMap<Language, ConfigurationDialog>();
public void createAndShowGUI(String inputText) {
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOS E);
textArea = new JTextArea(inputText);
// TODO: wrong line number is displayed for lines that are wrapped automatically:
textArea.setLineWrap(true);
textArea.setWrapStyleWord(true);
resultArea = new JTextPane();
resultArea.setContentType("text/html");
resultArea.setText("Results will appear here");
JLabel label = new JLabel("Please type or paste text to check in the top area");
JButton button = new JButton("Check text");
button.setMnemonic(''c'');
button.addActionListener(this);
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