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package lecture5.objects;
import java.util.ArrayList;
import java.util.Collections;
/**
* This program keeps track of a list of persons names and ages.
*
* @author Martin Vatshelle
*/
public class PersonsObjects {
public static void main(String[] args) {
ArrayList<Person> persons = new ArrayList<Person>();
fill(persons);
printAll(persons);
removeLast(persons);
System.out.println();
printAll(persons);
}
/**
* Persons are stored in 2 lists,
* index i in names gives the name of person i and
* index i in ages gives the age of person i
*
* This method removes the last person from the list
*
* @param names a list of names
* @param ages a list of ages
*/
private static void removeLast(ArrayList<Person> persons) {
persons.remove(persons.size()-1);
}
/**
* Fills two lists with the same number of elements.
* names.get(i) and ages.get(i) are the name and age of person i
*
* @param names The List of names to be filled
* @param ages The List of ages to be filled
*/
public static void fill(ArrayList<Person> persons) {
persons.add(new Person("Anna",12));
persons.add(new Person("Per",3));
persons.add(new Person("Hans",7));
persons.add(new Person("Lise",9));
}
/**
* Prints out the names and ages of a list of Persons
*
* @param names
* @param ages
*/
public static void printAll(ArrayList<Person> persons) {
for(int i=0; i<persons.size(); i++) {
Person p = persons.get(i);
System.out.println(p.name+" is "+ p.age+" years.");
}
}
}