Person.java

import java.util.HashMap;
import java.util.Map;

public class Person {
	private final String _firstName;
	private final String _lastName;
	private final String _dept;
	private final String _phone;
	private final int _age;

	public Person(String firstName, String lastName, String dept, String phone, int age) {
		_firstName = firstName;
		_lastName = lastName;
		_dept = dept;
		_phone = phone;
		_age = age;
	}

	public String getFirstName() {
		return _firstName;
	}

	public String getLastName() {
		return _lastName;
	}

	public String getDept() {
		return _dept;
	}

	public String getPhone() {
		return _phone;
	}

	public int getAge() {
		return _age;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + _age;
		result = prime * result + ((_dept == null) ? 0 : _dept.hashCode());
		result = prime * result + ((_lastName == null) ? 0 : _lastName.hashCode());
		result = prime * result + ((_phone == null) ? 0 : _phone.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj) {
			return true;
		}
		if (obj == null) {
			return false;
		}
		if (getClass() != obj.getClass()) {
			return false;
		}
		Person other = (Person) obj;
		if (_age != other._age) {
			return false;
		}
		if (_dept == null) {
			if (other._dept != null) {
				return false;
			}
		}
		else if (!_dept.equals(other._dept)) {
			return false;
		}
		if (_lastName == null) {
			if (other._lastName != null) {
				return false;
			}
		}
		else if (!_lastName.equals(other._lastName)) {
			return false;
		}
		if (_phone == null) {
			if (other._phone != null) {
				return false;
			}
		}
		else if (!_phone.equals(other._phone)) {
			return false;
		}
		return true;
	}

	@Override
	public String toString() {
		return "Person [_firstName=" + _firstName + ", _lastName=" + _lastName + ", _dept=" + _dept + ", _phone=" + _phone + ", _age=" + _age + "]";
	}

	public static void main(String[] args) {
		try {
			Person billy = new Person("Billy", "Johnson", "Acct", "5123", 33);
			Person bobby = new Person("Bobby", "Johnson", "Acct", "5123", 33);
			Map<Person, Integer> bonusForPerson = new HashMap<Person, Integer>();
			bonusForPerson.put(bobby, 10000);
			bonusForPerson.put(billy, 10);
			System.out.println("Person.main: " + bonusForPerson.get(bobby));
		}
		catch (Throwable e) {
			e.printStackTrace();
		}
	}
}