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java.lang.Integer
java.lang.ClassCastException: java.lang.Integer	at postfix2.calculatePostfix(postfix2.java:26)	at TheFrame.actionPerformed(ExpressionConverter.java:81)	at java.awt.Button.processActionEvent(Unknown Source)	at java.awt.Button.processEvent(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(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(Unknown Source)