使用 MigLayout 将 JLabel 添加到 JPanel 时出现类转换异常

Question

我有以下代码：

JPanel panel = new JPanel(new MigLayout());;

JLabel label = new JLabel("Sample Label")

panel.add(label, "gaptop 20, gapbottom 20,wrap");

当我查看MigLayout文档时，上面的代码对我来说看起来是有效的，但在运行时它会抛出java.lang.ClassCastException异常，并带有下面的堆栈跟踪

java.lang.ClassCastException: java.lang.String cannot be cast to net.miginfocom.layout.CC

        at com.intellij.ui.layout.migLayout.patched.MigLayout.addLayoutComponent(MigLayout.kt:403)

        at java.awt.Container.addImpl(Container.java:1128)

        at java.awt.Container.add(Container.java:973)

        at com.xxx.size.plugin.MemoryMeasurementTool_Tool.loadToolResultPanel(xxxMeasurementTool_Tool.java:58)

        at com.xxx.size.plugin.MemoryAnalyzer$1.run(xxxAnalyzer.java:75)

        at jetbrains.mps.smodel.WorkbenchModelAccess$UndoContextSetup.run(WorkbenchModelAccess.java:378)

        at jetbrains.mps.smodel.ActionDispatcher.dispatch(ActionDispatcher.java:84)

        at jetbrains.mps.smodel.ActionDispatcher.lambda$wrap$0(ActionDispatcher.java:105)

        at jetbrains.mps.smodel.ActionDispatcher.dispatch(ActionDispatcher.java:84)

        at jetbrains.mps.smodel.ActionDispatcher.lambda$wrap$0(ActionDispatcher.java:105)

        at jetbrains.mps.smodel.LockRunnable.run(LockRunnable.java:60)

        at jetbrains.mps.smodel.TryRunPlatformWriteHelper.lambda$tryWrite$2(TryRunPlatformWriteHelper.java:122)

        at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:1057)

        at jetbrains.mps.smodel.TryRunPlatformWriteHelper.runWrite(TryRunPlatformWriteHelper.java:103)

        at jetbrains.mps.smodel.TryRunPlatformWriteHelper.tryWrite(TryRunPlatformWriteHelper.java:120)

        at jetbrains.mps.smodel.WorkbenchModelAccess.lambda$tryWriteInCommand$4(WorkbenchModelAccess.java:226)

        at jetbrains.mps.util.ComputeRunnable.compute(ComputeRunnable.java:32)

        at jetbrains.mps.util.AbstractComputeRunnable.run(AbstractComputeRunnable.java:27)

Answer 1

看起来，您使用了错误的导入（您使用由 Intellij Idea 修补的 MigLayout，该用法可能与标准用法不同）。检查您的 MigLayout 是否导入为：import net.miginfocom.swing.MigLayout;