Question

抄了段代码，在Eclipse下运行出现如下问题，请问怎么解决

Exception in thread "main" java.lang.ClassCastException: java.lang.Integer cannot be cast to org.eclipse.swt.layout.GridData
at org.eclipse.swt.layout.GridLayout.layout(Unknown Source)
at org.eclipse.swt.layout.GridLayout.layout(Unknown Source)
at org.eclipse.swt.widgets.Composite.updateLayout(Unknown Source)
at org.eclipse.swt.widgets.Composite.WM_SIZE(Unknown Source)
at org.eclipse.swt.widgets.Canvas.WM_SIZE(Unknown Source)
at org.eclipse.swt.widgets.Decorations.WM_SIZE(Unknown Source)
at org.eclipse.swt.widgets.Control.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Canvas.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Decorations.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Shell.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Display.windowProc(Unknown Source)
at org.eclipse.swt.internal.win32.OS.ShowWindow(Native Method)
at org.eclipse.swt.widgets.Decorations.setVisible(Unknown Source)
at org.eclipse.swt.widgets.Shell.setVisible(Unknown Source)
at org.eclipse.swt.widgets.Shell.open(Unknown Source)
at Calculator.<init>(Calculator.java:43)
at Calculator.main(Calculator.java:151)

Answer 1

你把本身是GridData的类强制转换为了Integer类型 ，所以报这个错

追问

private Composite com1;

com1.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); 是这一句的问题吗？

追答

我说反了，异常说是Integer不能转为GridData,你在在看看其他地方，你发那句好像没什么问题

追问

额，学得太少，还是搞不懂，不过还是采纳了哈

Answer 2

强转出错...,如果确认代码是没问题的,看看你的jdk是不是1.5以上

追问

我用的是JDK1.6,
private Composite com1;
com1.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); 只有这一段用到了这个，该怎么改？

Answer 3

类型转换的问题吧