Sorting an array of objects by an attribute

Question

I'm pretty new to java so don't laugh if you think my question is real easy!
I have an array of objects and I want to sort them according to an integer value stored in each object. Any help would be very much appreciated.
Thanks for looking!!

Answer 1

Perhaps an example would help:
public class Person {
  private String name;
  private int age;
  public void setName(String name) { this.name = name; }
  public void setAge(int age) { this.age = age; }
  public String getName() { return name; }
  public int getAge() { return age; }
=====
public class PersonAgeSorter implements Comparable {
  public int compare(Object o1, Object o2) {
    Person p1 = (Person) o1;
    Person p2 = (Person) o2;
    Integer i1 = new Integer(p1.getAge());
    Integer i2 = new Integer(p2.getAge());
    return i1.compareTo(i2);
=====
public class PersonNameSorter implements Comparable {
  public int compare(Object o1, Object o2) {
    Person p1 = (Person) o1;
    Person p2 = (Person) o2;
    String s1 = p1.getName();
    String s2 = p2.getName();
    return s1.compareTo(s2);
=====
import java.util.Arrays;
public class SortExample {
  public static void main(String [] args) {
  Person p1 = new Person();
  Person p2 = new Person();
  p1.setName("Tom");
  p1.setAge(22);
  p2.setName("Nancy");
  p2.setAge(33);
  Person [] people = new Person[2];
  people[0] = p1;
  people[1] = p2;
  Arrays.sort(people, new PersonAgeSorter());
  Arrays.sort(people, new PersonNameSorter());
}