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java.lang.String cannot be cast to inventory.Book
java.lang.ClassCastException: java.lang.String cannot be cast to inventory.Book	at inventory.InventoryGUI.jComboBox1ActionPerformed(InventoryGUI.java:182)	at inventory.InventoryGUI.access$100(InventoryGUI.java:10)	at inventory.InventoryGUI$2.actionPerformed(InventoryGUI.java:95)	at javax.swing.JComboBox.fireActionEvent(JComboBox.java:1260)	at javax.swing.JComboBox.setSelectedItem(JComboBox.java:588)	at javax.swing.JComboBox.setSelectedIndex(JComboBox.java:624)	at javax.swing.plaf.basic.BasicComboPopup$Handler.mouseReleased(BasicComboPopup.java:835)	at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:290)	at java.awt.Component.processMouseEvent(Component.java:6505)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)	at javax.swing.plaf.basic.BasicComboPopup$1.processMouseEvent(BasicComboPopup.java:499)	at java.awt.Component.processEvent(Component.java:6270)	at java.awt.Container.processEvent(Container.java:2229)	at java.awt.Component.dispatchEventImpl(Component.java:4861)	at java.awt.Container.dispatchEventImpl(Container.java:2287)	at java.awt.Component.dispatchEvent(Component.java:4687)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)	at java.awt.Container.dispatchEventImpl(Container.java:2273)	at java.awt.Window.dispatchEventImpl(Window.java:2719)	at java.awt.Component.dispatchEvent(Component.java:4687)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:723)	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.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)	at java.awt.EventQueue$4.run(EventQueue.java:696)	at java.awt.EventQueue$4.run(EventQueue.java:694)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:693)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)