File list (Check if you may need any files):
HelloWorld.java
Client.class
Server.class
workspace
.........\.metadata
.........\.........\.lock
.........\.........\.plugins
.........\.........\........\org.eclipse.core.resources
.........\.........\........\..........................\.history
.........\.........\........\..........................\........\1f
.........\.........\........\..........................\........\..\0023990a5b7e001515e3efbc50a97dc3
.........\.........\........\..........................\........\32
.........\.........\........\..........................\........\..\5034d5fe5a7e001515e3efbc50a97dc3
.........\.........\........\..........................\........\4a
.........\.........\........\..........................\........\..\b0cb0c485b7e001515e3efbc50a97dc3
.........\.........\........\..........................\........\4b
.........\.........\........\..........................\........\..\306c97515b7e001515e3efbc50a97dc3
.........\.........\........\..........................\........\6e
.........\.........\........\..........................\........\..\5073a04e5b7e001515e3efbc50a97dc3
.........\.........\........\..........................\........\88
.........\.........\........\..........................\........\..\c0b5b2f35a7e001515e3efbc50a97dc3
.........\.........\........\..........................\........\a9
.........\.........\........\..........................\........\..\b083d22f5a7e001515e3efbc50a97dc3
.........\.........\........\..........................\.projects
.........\.........\........\..........................\.........\HelloWorld
.........\.........\........\..........................\.........\..........\.indexes
.........\.........\........\..........................\.........\..........\........\history.index
.........\.........\........\..........................\.........\..........\.markers
.........\.........\........\..........................\.........\..........\org.eclipse.jdt.core
.........\.........\........\..........................\.........\..........\....................\state.dat
.........\.........\........\..........................\.root
.........\.........\........\..........................\.....\.indexes
.........\.........\........\..........................\.....\........\history.version
.........\.........\........\..........................\.....\........\properties.index
.........\.........\........\..........................\.....\........\properties.version
.........\.........\........\..........................\.....\1.tree
.........\.........\........\..........................\.safetable
.........\.........\........\..........................\..........\org.eclipse.core.resources
.........\.........\........\org.eclipse.core.runtime
.........\.........\........\........................\.settings
.........\.........\........\........................\.........\org.eclipse.core.resources.prefs
.........\.........\........\........................\.........\org.eclipse.debug.ui.prefs
.........\.........\........\........................\.........\org.eclipse.jdt.core.prefs
.........\.........\........\........................\.........\org.eclipse.jdt.debug.ui.prefs
.........\.........\........\........................\.........\org.eclipse.jdt.launching.prefs
.........\.........\........\........................\.........\org.eclipse.jdt.ui.prefs
.........\.........\........\........................\.........\org.eclipse.ui.editors.prefs
.........\.........\........\........................\.........\org.eclipse.ui.ide.prefs
.........\.........\........\........................\.........\org.eclipse.ui.prefs
.........\.........\........\org.eclipse.debug.core
.........\.........\........\......................\.launches
.........\.........\........\......................\.........\HelloWorldNTimes.launch
.........\.........\........\org.eclipse.debug.ui
.........\.........\........\....................\dialog_settings.xml
.........\.........\........\....................\launchConfigurationHistory.xml
.........\.........\........\org.eclipse.jdt.core
.........\.......