Forty Thieves

Goals

Know when to make a variables and methods static or dynamic with OOP

Note

A variable that in not static (i.e. dynamic) is unique per object i.e. have unique copies of the data.
A variable needs to be static if you need data that is not unique per object but rather something all objects can share.
A method is static it needs if it is not describing an objects behavior.
Remember the rules for what static and dynamic methods can acess.

Overview

The Forty Thieves are a criminal organization whose members are supposed to contribute all their takings to a communal pot that's shared amongst all the Thieves. The problem is, thieves are greedy and generally underreport their take after each job. All the thieves have a "greed" rating, which represents the percentage of the money they will keep for themselves and add to their personal stash -- the rest will go to the communal pot (shared stash). When a thief gets captured, the thief loses his or her personal stash. If there is enough money in the communal pot to cover their bail, the Forty Thieves spend that amount to bail the thief out (otherwise the thief remains captured).

Write the Thief class to simulate the behavior of a Thief in Thief.java. Add any necessary variables and complete the isFree(), getStash(), getSharedStash(), rob(), and getCapturedAndAttemptBail() methods. Assume that greed is between 0 and 1 (inclusive), and that all values passed to rob() and getCapturedAndAttemptBail() are greater than 0.

Overview of Methods

Return-Type	Method Name	Input(s) type	Behavior
boolean	isFree	none	returns true if the Thief is free, false otherwise
double	getStash	none	returns the size of the Thief's personal stash
double	getSharedStash	none	returns the size of the Thieves' communal stash
void	rob	double	the thief siezes the given amount of money, contributing the appropriate amount to the communal stash and keeping the rest for itself. Assumes the thief is free.
boolean	getCapturedAndAttemptBail	double	the thief is captured as per the description above. Try to bail out the Thief, and return true if successful (false otherwise). Assumes the Thief is free. "Bail" means money paid to court to release a criminal.
double	getThievesStash	none	returns the size of the communal stash (Note: there little bit of difference between this method and getSharedStash)

Sample Interactions thief.hist (use .hist file to save time typing).

> Thief bill = new Thief(.25);  // bill's greed factor is .25, meaning he keeps 25% for himself
> Thief george = new Thief(.5); // george keeps 50% of the amount he robs to himself
> bill.getStash()
0.0
> bill.getSharedStash()
0.0
> bill.rob(800.00);  // bill robs $800 and keeps 25%  for himself
> bill.getStash()
200.0
> bill.getSharedStash()
600.0
> bill.isFree()
true
> george.rob(1000.00);  // george robs $1000 and keeps 50% for himself
> george.getStash()
500.0
> george.getSharedStash()
1100.0
> bill.getSharedStash()
1100.0
> bill.getCapturedAndAttemptBail(400.00) 
true           // there's enough shared $ to cover bill's $400.00 bail
> bill.isFree()
true
> bill.getStash()
0.0
> bill.getSharedStash()
700.0
> george.getStash()
500.0
> george.getCapturedAndAttemptBail(750.00)
false         // there's not enough shared $ to cover george's $750.00 bail
> george.isFree()
false
> george.getStash()
0.0
> george.getSharedStash() //line 1
700.0
> bill.getSharedStash()
700.0
> Thief.getThievesStash()   //What is the difference between this statement and line 1
700.00