public class Person  {

	// attributes
	private String id;      // id of the person
	private int    age;     // age of the person
	private String bff;     // id best friend for ever of the person

	// default constructor

	public Person() {
		this.setID( "" );
		this.setAge( 0 );
		this.setBFF( null );
	}

	//  specific constructor
	public Person( String s, int a, String b ) {
		this.setID( s );
		this.setAge( a );
		this.setBFF( b );
	}

	// mutators

	// setID(): update Id attribute of person to s
	public void setID( String s ) {
		this.id = s;
	}

	// setAge(): if sensible, update age attribute of person to a
	public void setAge( int a ) {
		if ( a >= 0 ) {
			this.age = a;
		}
	}

	// setBFF(): update bff attribute of person to b
	public void setBFF( String b ) {
		this.bff = b;
	}

	// accessors

	// getID(): return the id of the person
	public String getID() {
		return this.id;
	}

	// getAge(): return the age of the person
	public int getAge() {
		return this.age;
	}

	// getBFF(): return the bff of the person
	public String getBFF() {
		return this.bff;
	} 

	// other messages

	// toString(): return a text representation of the person
	public String toString() {
		String s = this.getID();
		int    a = this.getAge();
		String b = this.getBFF();

		String representation = s + "(" + a + ", " + b + ")" ;

		return representation;
	}

	// equals(): returns whether the people are the same (i.e., same id )
	public boolean equals( Person p ) {
		String n1 = this.getID();
		String n2 = p.getID();

		boolean comparison = ( n1.equals( n2 ) ) ;

		return comparison;
	}

	// isAdult(): reports whether the person can vote
	public boolean isAdult() {
		return false;
	}

	// mature(): increase the age of the person by n years
	public void mature( int n ) {
	}

	// makeLoner(): remove the bff of the person (i.e., null out the bff)
	public static void makeLoner() {
	}

	// mutualBFF(): are the person and p mutual bff's
	public static boolean areMutualBFF( Person p ) {
		return false;
	}
}