Unit 5 demo - PiggyBank

PiggyBank.java

//
// PiggyBank.java
//


public class PiggyBank
{
    public PiggyBank()
    {
        nickels = 0;
        dimes = 0;
        quarters = 0;
    }

    // (normal) member functions

    public int total()
    {
        return nickels*5 + dimes*10 + quarters*25;
    }

    public void addNickel()
    {
        nickels += 1;
    }

    public void addDime()
    {
        dimes += 1;
    }

    public void addQuarter()
    {
        quarters += 1;
    }

    // static function  ("class function")

    public static int valueOfDime()
    {
        return 10;
    }

    // static variable ("class variable")
    
    public static float PI = 3.14f;

        
    private int nickels;
    private int dimes;
    private int quarters;
}

PiggyBankTest.java

//
// PiggyBankTest.java
//


public class PiggyBankTest
{
    public static void main(String[] args)
    {
        PiggyBank piggyBank = new PiggyBank();

        piggyBank.addNickel();
        piggyBank.addNickel();
        piggyBank.addNickel();
        piggyBank.addDime();
        piggyBank.addDime();
        piggyBank.addQuarter();
        piggyBank.addQuarter();

        System.out.println("total: " + piggyBank.total());

        System.out.println("value of dime: " + 
                PiggyBank.valueOfDime());

        System.out.println("pi: " + Math.PI);
        System.out.println("piggybank pi: " + PiggyBank.PI);
    }


}