class Person
{
    public Person( String n, int a )
    {
        this( n, a, "unknown" );
    }
    
    public Person( String n, int a, String add )
    {
        this( n, a, add, "unlisted" );
    }
    
    public Person( String n, int a, String add, String pn )
    {
        name = n;
        age = a;
        address = add;
        phoneNumber = pn;
    }
     
    public String toString( )
    {
        return name + " " + age + " " + phoneNumber + " " + address;
    }
    
    public String getName( )
    {
        return name;
    }
    
    public int getAge( )
    {
        return age;
    }
    
    public String getAddress( )
    {
        return address;
    }
    
    public String getPhoneNumber( )
    {
        return phoneNumber;
    }
    
    private String name;
    private int age;
    private String address;
    private String phoneNumber;
}

class Student extends Person   // Student IS-A Person
{
    public Student( String n, int a, String add, String pn, double g  )
    {
        super( n, a, add, pn );
        init( g );
    }
    
    public Student( String n, int a, double g )
    {
        super( n, a );
        init( g );
    }
    
    public Student( String n, int a, String add, double g  )
    {
        super( n, a, add );
        init( g );
    }
    
    
    private void init( double g )
    {
        gpa = g;
    }
    
    public String toString( )
    {
        return super.toString( ) + " " + gpa;
    }
    public double getGPA( )
    {
        return gpa;
    }
    
    private double gpa;
}

class Employee extends Person
{
    public Employee( String n, int a, String add, String pn, double sal  )
    {
        super( n, a, add, pn );
        salary = sal;
    }
    
    public Employee( String n, int a, double sal )
    {
        super( n, a );
        salary = sal;
    }
    
    public String toString( )
    {
        return super.toString( ) + " who makes $" + salary;
    }
    
    public double getSalary( )
    {
        return salary;
    }
    
    private double salary;
}
class Day2
{
    public static void printAllPersons( Person [ ] arr )
    {
        for( int i = 0; i < arr.length; i++ )
            System.out.println( "Person #" + i + ": " + arr[ i ].toString( ) );
    }
    
    // Assume there is one person in position 0
    public static Person getOldest( Person [ ] arr )
    {
        Person oldest = arr[ 0 ];
        
        for( int i = 1; i < arr.length; i++ )
            if( arr[ i ] != null && arr[ i ].getAge( ) > oldest.getAge( ) )
                oldest = arr[ i ];
        
        return oldest;
    }
    
    public static void main( String [ ] args )
    {
        Person [ ] arr = new Person[ 5 ];
        
        arr[ 0 ] = new Student( "Jane", 29, "1 Ocean Dr", "305-673-0000", 4.0 );
        arr[ 4 ] = new Student( "Chris", 31, "11200 SW 8 St", 3.7 );
        arr[ 2 ] = new Student( "Fran", 30, 3.9 );
        arr[ 3 ] = new Person( "Jim", 41 );
        arr[ 1 ] = new Employee( "Mitch", 62, 500000.0 );
        
        printAllPersons( arr );
        
        System.out.println( "Oldest person is " + getOldest( arr ) );
        
        
    }
}