我有两个 JFrame，当单击第一个 JFrame 时，它会根据按下和释放鼠标的位置打开第二个。它们都没有装饰，当我将不透明度设置为时它工作正常
setOpacity(0.3f);
在第一帧中，当它被点击时，第二帧的不透明度是
setOpacity(1.0f);
但是，当我将第二帧的不透明度更改为 1.0 以下的任何值时，我会收到以下错误。
线程“AWT-EventQueue-0”java.awt.IllegalComponentStateException 中的异常：框架在 BackWindow$3.mouseReleased(BackWindow. java:58) 在 java.awt.Component.processMouseEvent(Unknown Source) 在 javax.swing.JComponent.processMouseEvent(Unknown Source) 在 java.awt.Component.processEvent(Unknown Source) 在 java.awt.Container.processEvent(Unknown源) 在 java.awt.Component.dispatchEventImpl(Unknown Source) 在 java.awt.Container.dispatchEventImpl(Unknown Source) 在 java.awt.Component.dispatchEvent(Unknown Source) 在 java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)在 java.awt 的 java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)。LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue。 dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$200(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController .doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.awt。 java.security.AccessController 中的 EventQueue$4.run(Unknown Source)。doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter （未知来源）在 java.awt.EventDispatchThread.pumpEvents（未知来源）在 java.awt.EventDispatchThread.pumpEvents（未知来源）在 java.awt.EventDispatchThread.run（未知来源）在 java.awt.EventDispatchThread.pumpEventsForHierarchy（未知来源）资源）pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(来源不明）pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(来源不明）
有谁知道错误是什么以及如何使第二帧的不透明度小于 1.0？提前致谢。