three_tier_architecture
.......................\build.xml
.......................\manifest.mf
.......................\test
.......................\src
.......................\...\presentation_layer
.......................\...\..................\Application_main.java
.......................\...\..................\UI.java
.......................\...\data_access_layer
.......................\...\.................\Access_JDBC.java
.......................\...\.................\DAcustomer.java
.......................\...\business_layer
.......................\...\..............\BLcustomer.java
.......................\nbproject
.......................\.........\build-impl.xml
.......................\.........\genfiles.properties
.......................\.........\project.properties
.......................\.........\project.xml
.......................\.........\private
.......................\.........\.......\private.properties
.......................\build
.......................\.....\classes
.......................\.....\.......\presentation_layer
.......................\.....\.......\..................\Application_main.class
.......................\.....\.......\..................\UI.class
.......................\.....\.......\data_access_layer
.......................\.....\.......\.................\Access_JDBC.class
.......................\.....\.......\.................\DAcustomer.class
.......................\.....\.......\business_layer
.......................\.....\.......\..............\BLcustomer.class