// demonstrates static/non-static fields and methods

// simulates a person (not in the Blade Runner sense)

public class Person {

// instance variable: age of this person

private int age;

// another instance variable: name of this person

private String name;

// static variable (shared by all instances): global population

private static int population = 0;

// constructor

public Person(int a, String n) {

// copy arguments of constructor to instance variables

age = a;

name = n;

// increase the static counter

population++;

}

// static method (not per-instance)

public static void printPop() {

System.out.println(population);

}

// instance method

public void printName() {

System.out.println(name);

}

// another instance method

public void printInfo() {

System.out.println(age);

// calling an instance method without a period

// (uses same instance as what printInfo was called on)

printName();

}

public static void main(String[] args) {

// calling a static method using class name and period

// what is the output?

Person.printPop();

// how many instances does this construct?

Person myDad = new Person(33, "Lucius");

Person myMom = new Person(44, "Pandora");

Person myDentist = myMom;

// calling an instance method using instance name and period

myDentist.printInfo();

// calling a static method without a period

// (uses Person, the containing class, by default)

// what is the output?

printPop();

}

}