Java,将此作为参数
我试图构建一个需要将自身传递给另一个类的类,但在尝试此操作时,我总是得到一个Java,将此作为参数,java,nullpointerexception,this,Java,Nullpointerexception,This,我试图构建一个需要将自身传递给另一个类的类,但在尝试此操作时,我总是得到一个NullPointerException。我应该先签什么?我使用netbeans并使用断点进行检查,但对象是正确的,而不是null 代码 堆栈跟踪: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at jatek.kartya.Kartya.setVisible(Kartya.java:193) at jatek
NullPointerException
。我应该先签什么?我使用netbeans并使用断点进行检查,但对象是正确的,而不是null
代码
堆栈跟踪:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at jatek.kartya.Kartya.setVisible(Kartya.java:193)
at jatek.jatekos.EmberiJatekos.lapHozzaad(EmberiJatekos.java:66)
at gui.MainJFrame.huz(MainJFrame.java:88)
at gui.MainJFrame.ujJatek(MainJFrame.java:57)
at gui.MainJFrame.<init>(MainJFrame.java:29)
at Main$1.run(Main.java:37)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:721)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:682)
at java.awt.EventQueue$3.run(EventQueue.java:680)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:691)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
线程“AWT-EventQueue-0”java.lang.NullPointerException中的异常
位于jatek.kartya.kartya.setVisible(kartya.java:193)
在jatek.jatekos.EmberiJatekos.lapHozzaad(EmberiJatekos.java:66)
位于gui.MainJFrame.huz(MainJFrame.java:88)
位于gui.MainJFrame.ujJatek(MainJFrame.java:57)
MainJFrame.(MainJFrame.java:29)
Main$1.run(Main.java:37)
在java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)中
位于java.awt.EventQueue.dispatchEventImpl(EventQueue.java:721)
在java.awt.EventQueue.access$200(EventQueue.java:103)
在java.awt.EventQueue$3.run(EventQueue.java:682)
在java.awt.EventQueue$3.run(EventQueue.java:680)
位于java.security.AccessController.doPrivileged(本机方法)
位于java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
位于java.awt.EventQueue.dispatchEvent(EventQueue.java:691)
位于java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
在java.awt.EventDispatchThread.PumpeEventsforFilter(EventDispatchThread.java:161)
位于java.awt.EventDispatchThread.PumpeEventsforHierarchy(EventDispatchThread.java:150)
位于java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
位于java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
在java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
MainJFrame.slotpool
为空…一些代码可能会有帮助。请共享一些代码。您可以向我们显示代码和异常堆栈跟踪吗?显然MainJFrame.slotpool
为空
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at jatek.kartya.Kartya.setVisible(Kartya.java:193)
at jatek.jatekos.EmberiJatekos.lapHozzaad(EmberiJatekos.java:66)
at gui.MainJFrame.huz(MainJFrame.java:88)
at gui.MainJFrame.ujJatek(MainJFrame.java:57)
at gui.MainJFrame.<init>(MainJFrame.java:29)
at Main$1.run(Main.java:37)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:721)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:682)
at java.awt.EventQueue$3.run(EventQueue.java:680)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:691)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)