1 can be applied to the case, but the database operations are not complicated. Which comprehensively covers all common database operations.

JDBC基础——缴费系统
....................\jkSYS
....................\.....\bak
....................\.....\...\biaodanchushihua.java~1~
....................\.....\...\caxun.java~1~
....................\.....\...\caxun.java~2~
....................\.....\...\caxun.java~3~
....................\.....\...\caxun.java~4~
....................\.....\...\caxun.java~5~
....................\.....\...\caxun.java~6~
....................\.....\...\caxun.java~7~
....................\.....\...\danju.java~1~
....................\.....\...\danju.java~2~
....................\.....\...\danju.java~3~
....................\.....\...\danju.java~4~
....................\.....\...\Frame2.java~1~
....................\.....\...\login.java~1~
....................\.....\...\login.java~2~
....................\.....\...\weiTiao.java~1~
....................\.....\...\zuoFei.java~1~
....................\.....\classes


....................\.....\.......\about.png
....................\.....\.......\addOperater.class
....................\.....\.......\addOperater_jButton2_actionAdapter.class
....................\.....\.......\addOperater_jButton3_actionAdapter.class
....................\.....\.......\addOperater_jButton4_actionAdapter.class
....................\.....\.......\biaodanchushihua.class
....................\.....\.......\biaodanchushihua_jButton1_actionAdapter.class
....................\.....\.......\biaodanchushihua_jButton2_actionAdapter.class
....................\.....\.......\biaodanchushihua_jButton3_actionAdapter.class
....................\.....\.......\biaodanchushihua_jButton4_actionAdapter.class
....................\.....\.......\caxun.class
....................\.....\.......\caxun_jButton1_actionAdapter.class
....................\.....\.......\caxun_jButton2_actionAdapter.class
....................\.....\.......\caxun_jButton3_actionAdapter.class
....................\.....\.......\caxun_jButton4_actionAdapter.class
....................\.....\.......\caxun_jButton5_actionAdapter.class
....................\.....\.......\caxun_jButton8_actionAdapter.class
....................\.....\.......\changPassword.class
....................\.....\.......\changPassword_jButton1_actionAdapter.class
....................\.....\.......\ChineseMoney.class
....................\.....\.......\closeFile.png
....................\.....\.......\danju.class
....................\.....\.......\danju_jButton1_actionAdapter.class
....................\.....\.......\danju_jButton2_actionAdapter.class
....................\.....\.......\danju_jComboBox11_keyAdapter.class
....................\.....\.......\danju_jComboBox11_popupMenuAdapter.class
....................\.....\.......\danju_jComboBox12_keyAdapter.class
....................\.....\.......\danju_jComboBox12_popupMenuAdapter.class
....................\.....\.......\danju_jComboBox14_actionAdapter.class
....................\.....\.......\danju_jComboBox15_keyAdapter.class
....................\.....\.......\danju_jComboBox15_popupMenuAdapter.class
....................\.....\.......\danju_jComboBox16_keyAdapter.class
....................\.....\.......\danju_jComboBox16_popupMenuAdapter.class
....................\.....\.......\danju_jComboBox18_keyAdapter.class
....................\.....\.......\danju_jComboBox18_popupMenuAdapter.class
....................\.....\.......\danju_jComboBox19_keyAdapter.class
....................\.....\.......\danju_jComboBox19_popupMenuAdapter.class
....................\.....\.......\danju_jComboBox2_keyAdapter.class
....................\.....\.......\danju_jComboBox2_popupMenuAdapter.class
....................\.....\.......\danju_jComboBox3_keyAdapter.class
....................\.....\.......\danju_jComboBox3_popupMenuAdapter.class
....................\.....\.......\danju_jComboBox4_keyAdapter.class
....................\.....\.......\danju_jComboBox4_popupMenuAdapter.class
....................\.....\.......\danju_jComboBox5_keyAdapter.class
....................\.....\.......\danju_jComboBox5_popupMenuAdapter.class
....................\.....\.......\danju_jComboBox6_keyAdapter.class
........

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