Calcute
.......\.classpath
.......\.project
.......\.settings
.......\.........\.jsdtscope
.......\.........\org.eclipse.core.resources.prefs
.......\.........\org.eclipse.jdt.core.prefs
.......\.........\org.eclipse.wst.jsdt.ui.superType.container
.......\.........\org.eclipse.wst.jsdt.ui.superType.name
.......\build
.......\.....\classes
.......\.....\.......\com
.......\.....\.......\...\add.class
.......\.....\.......\...\delete.class
.......\.....\.......\...\devide.class
.......\.....\.......\...\Factory.class
.......\.....\.......\...\ICal.class
.......\.....\.......\...\mutiply.class
.......\.....\.......\...\MyServlet.class
.......\.....\.......\...\MyTools.class
.......\src
.......\...\com
.......\...\...\add.java
.......\...\...\delete.java
.......\...\...\devide.java
.......\...\...\Factory.java
.......\...\...\ICal.java
.......\...\...\mutiply.java
.......\...\...\MyServlet.java
.......\...\...\MyTools.java
.......\WebContent
.......\..........\index.jsp
.......\..........\META-INF
.......\..........\........\MANIFEST.MF
.......\..........\WEB-INF
.......\..........\.......\lib
.......\..........\.......\web.xml