What's causing errors in an Eclipse-specific for java?

This is how the code looked when it was working:

Now it looks like this, notice the change in colors for example in args. What caused this? and how do I fix this so it works like before?

Make the code work like before and fix all those errors.

A Problems X @ Javadoc D Declaration e Console 33 errors, 16 warnings, 0 others Description Resource Path Location O Errors (33 items) a action cannot be resolved FlightReservatio.. /AirCraft2/src line 90 Java Problem a action cannot be resolved FlightReservatio... /AirCraft2/src line 123 Java Problem a action cannot be resolved FlightReservatio.. /AirCraft2/src line 137 Java Problem a action cannot be resolved FlightReservatio.. /AirCraft2/src FlightReservatio.. /AirCraft2/src FlightReservatio... /AirCraft2/src FlightReservatio.. /AirCraft2/src FlightReservatio.. /AirCraft2/src line 142 Java Problem a action cannot be resolved line 146 Java Problem a action cannot be resolved a action cannot be resolved a action cannot be resolved line 149 Java Problem line 162 Java Problem line 187 Java Problem a action cannot be resolved FlightReservatio.. /AirCraft2/src line 197 Java Problem a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved a commandLine cannot be resolved E Duplicate local variable flightNum * Duplicate local variable flightNum a Duplicate local variable flightNum O Syntax error on token "else", delete this token FlightReservatio... /AirCraft2/src line 97 Java Problem FlightReservatio.. /AirCraft2/src line 99 Java Problem FlightReservatio.. /AirCraft2/src line 101 Java Problem FlightReservatio.. /AirCraft2/src line 103 Java Problem FlightReservatio.. /AirCraft2/src line 105 Java Problem FlightReservatio.. /AirCraft2/src line 107 Java Problem FlightReservatio.. /AirCraft2/src line 128 Java Problem FlightReservatio.. /AirCraft2/src line 130 Java Problem FlightReservatio.. /AirCraft2/src line 151 Java Problem FlightReservatio... /AirCraft2/src line 153 Java Problem FlightReservatio.. /AirCraft2/src line 164 Java Problem FlightReservatio.. /AirCraft2/src line 166 Java Problem FlightReservatio.. /AirCraft2/src line 189 Java Problem FlightReservatio... /AirCraft2/src line 191 Java Problem FlightReservatio.. /AirCraft2/src line 199 Java Problem FlightReservatio.. /AirCraft2/src line 201 Java Problem FlightReservatio.. /AirCraft2/src FlightReservatio... /AirCraft2/src FlightReservatio... /AirCraft2/src line 213 Java Problem line 215 Java Problem line 217 Java Problem FlightReservatio.. /AirCraft2/src line 219 Java Problem FlightReservatio... /AirCraft2/src FlightReservatio.. /AirCraft2/src FlightReservatio... /AirCraft2/src line 163 Java Problem line 188 Java Problem line 198 Java Problem FlightReservatio. /AirCraft2/src line 90 Java Problem & Warnings (16 items) >