Question

java图形界面错误，错误如下，NullPointerException，但是Text里面输入了内容，就是获取不了

java.lang.NullPointerException
at Manage.ManageView.getMark(ManageView.java:86)
at Manage.Calculate.<init>(Calculate.java:7)
at Manage.ManageView$1.widgetSelected(ManageView.java:206)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4170)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759)
at Manage.ManageView.open(ManageView.java:71)
at Manage.ManageView.main(ManageView.java:55)

错误发生在这里：

错误代码：text_2.getText()，类型是org.eclipse.swt.widgets.Text;

若以下回答无法解决问题，邀请你更新回答

Answer 1

代码贴出来看看