TreeMap Update Tutorial

The sample code changes the population of Peru.

Add one million to the population of Brazil.

Change the region of Venezuela to "North America". It will no longer show up in the list.

Change the region of "United Kingdom" to "South America". It might improve the weather.

Use the remove method to destroy Surinam

Rio de Janeiro has:

• area 43000
• pop 15500000
• gdp 24693600000

Create a new country called "Rio de Janeiro" and give it the figures shown above. Don't forget to take these off Brazil.

Chile takes over Brazil! Add the area, population and gdp of Brazil into Chile, remove Brazil.

Plucky Colombia takes over the whole of South America, transfer all resources to Colombia and remove every other country of South America.

 for (Country c : world.values){
   if (...)
     world.remove(c.name);
 }

 TreeMap<String,Country> doomed =
     new TreeMap<String,Country>();
 for (Country c : world)
   if (...){
     ...
     doomed.put(c.name,c);
   }
 for  (String n:doomed.keySet())
   world.remove(n);