Using java to write a simple classroom management system DB2 database

DB2\.classpath
...\.project
...\.settings\org.eclipse.jdt.core.prefs
...\ClassRoomManage$1.class
...\ClassRoomManage$2.class
...\ClassRoomManage$AddButtonListener1$AddRoom$1.class
...\ClassRoomManage$AddButtonListener1$AddRoom$2.class
...\ClassRoomManage$AddButtonListener1$AddRoom.class
...\ClassRoomManage$AddButtonListener1.class
...\ClassRoomManage$AddButtonListener2$AddLongUseRoom$1.class
...\ClassRoomManage$AddButtonListener2$AddLongUseRoom$2.class
...\ClassRoomManage$AddButtonListener2$AddLongUseRoom.class
...\ClassRoomManage$AddButtonListener2.class
...\ClassRoomManage$AddButtonListener3$AddTemUseRoom$1.class
...\ClassRoomManage$AddButtonListener3$AddTemUseRoom$2.class
...\ClassRoomManage$AddButtonListener3$AddTemUseRoom.class
...\ClassRoomManage$AddButtonListener3.class
...\ClassRoomManage$CRM_GUI$1.class
...\ClassRoomManage$CRM_GUI.class
...\ClassRoomManage$RemoveButtonListener1.class
...\ClassRoomManage$RemoveButtonListener2$RemoveLongUseRoom$1.class
...\ClassRoomManage$RemoveButtonListener2$RemoveLongUseRoom$2.class
...\ClassRoomManage$RemoveButtonListener2$RemoveLongUseRoom.class
...\ClassRoomManage$RemoveButtonListener2.class
...\ClassRoomManage$RemoveButtonListener3$RemoveTemUseRoom$1.class
...\ClassRoomManage$RemoveButtonListener3$RemoveTemUseRoom$2.class
...\ClassRoomManage$RemoveButtonListener3$RemoveTemUseRoom.class
...\ClassRoomManage$RemoveButtonListener3.class
...\ClassRoomManage$SearchButtonListener$SearchGUI$1.class
...\ClassRoomManage$SearchButtonListener$SearchGUI$2.class
...\ClassRoomManage$SearchButtonListener$SearchGUI$3.class
...\ClassRoomManage$SearchButtonListener$SearchGUI$ButtonListener.class
...\ClassRoomManage$SearchButtonListener$SearchGUI.class
...\ClassRoomManage$SearchButtonListener.class
...\ClassRoomManage$ViewButtonListener1.class
...\ClassRoomManage$ViewButtonListener2.class
...\ClassRoomManage$ViewButtonListener3.class
...\ClassRoomManage.class
...\ClassRoomManage.java
...\DataBase.class
...\DataBase.java
...\longuse.txt
...\room.txt
...\.settings
DB2

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