我正在阅读文本文件（始终只有一行）。采取并将其附加到MoviesTextArea。
我已经尝试过移动语句变量。
public static void viewMovies() throws Exception {
File file = new File("MovieStorage.txt");
FileReader fileReader = new FileReader(file);
BufferedReader reader = new BufferedReader(fileReader);
String statement = "";
while ((statement = reader.readLine()) != null) {
System.out.println(statement);
MoviesTextArea.append(statement);
}
reader.close();
}
堆栈跟踪：
at MovieShower.viewMovies(MovieShower.java:34)
at Window1$3.actionPerformed(Window1.java:74)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
根据要求添加了堆栈跟踪。
我希望语句字符串可以追加！
最佳答案
您的代码甚至不应该编译-在发布的代码段中未定义MoviesTextArea-但正如@Luke所说，它几乎必须为null。
另外，MoviesTextArea以大写字母开头，因此它应该是一个类（类的实例应始终以小写字母开头）。如果确实是这种情况，则该类不能为null，这将使null指针异常成为不可能。
因此，我的猜测是这是一个实例，并且您没有遵循将实例小写的惯例，这只会给尝试提供帮助的人增加混乱。
如果您可以发布一些可编译，运行并显示错误的代码，我们可以为您提供更多帮助。 （最少的可验证可执行示例或类似示例）