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Using Collections and Arrays

In this exercise, you will see how the Collections Framework supporting classes of Collections and Arrays can help you manipulate and work with data more easily.

Cet exercice fait partie du cours

Data Types and Exceptions in Java

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Instructions

  • Add "Lima", "Bogota", "Santiago" to the capitals ArrayList.
  • Convert the array in the euCapitals variable to a List.
  • Sort capitals alphabetically.
  • Reverse the order of capitals

Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de code.

public class AllTheCities {

	public static void main(String[] args) {
		String[] euCapitals = {"Paris", "London", "Prague"};
		ArrayList capitals = new ArrayList();
        
        // Add cities to capitals all at once
		Collections.____(____, "Lima", "Bogota", "Santiago");
        // Convert euCapitals to List
        ____<____> euCapitalsList = Arrays.____(euCapitals);
        // Sort capitals
        ____.____(capitals);
        // Reverse capitals
        Collections.____(____);
        
		System.out.println(capitals);
		System.out.println(euCapitalsList);
		System.out.println(euCapitals);
	}
}
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