java语言的科学与艺术-编程练习6.5

/*
* File:GambleMachine.java
* ------------------------
* 模拟“赌博机”
*/
import acm.util.*;
import acm.program.*;

public class GambleMachine extends ConsoleProgram {
public void run(){
String ask = "Would you like to play? ";
if(readLine("Would you like instructions? ").equals("yes")){
println("BAR        BAR        BAR   -- YOU WILL WIN $250");
println("BELL        BELL    BELL  -- YOU WILL WIN $20");
println("................");/*介绍懒得写了*/
}
while(true){
if(askQuestion()){
MONEY -= 1;
if(MONEY == 0) break;
oneTime();
}else{
break;
}

}

}
/*
* 进行询问是否继续。
*/
private boolean askQuestion(){
String list = "You have $" + MONEY + ". ";
String ask = "Would you like to play? ";
boolean result = false;
if(readLine(list + ask).equals("yes")){
result = true;
}else{
result = false;
}
return result;
}
/*
* 执行一次赌博机
* 如果获利，加上相应的MONEY。
*/
private void oneTime(){
int window1 = rgen.nextInt(1, 6);
int window2 = rgen.nextInt(1, 6);
int window3 = rgen.nextInt(1, 6);
if(window1 == 6 && window2 == 6 && window3 == 6){
println(listWin(window1) + "    " + listWin(window2) + "    " + listWin(window3) + "--    You win $250");
MONEY += 250;
} else if(window1 == 5 && window2 == 5 && window3 == 5){
println(listWin(window1) + "    " + listWin(window2) + "    " + listWin(window3) + "--    You win $20");
MONEY += 20;
} else if(window1 == 5 && window2 == 5 && window3 == 6){
println(listWin(window1) + "    " + listWin(window2) + "    " + listWin(window3) + "--    You win $20");
MONEY += 20;
} else if(window1 == 4 && window2 == 4 && window3 == 4){
println(listWin(window1) + "    " + listWin(window2) + "    " + listWin(window3) + "--     You win $14");
MONEY += 14;
} else if(window1 == 4 && window2 == 4 && window3 == 6){
println(listWin(window1) + "    " + listWin(window2) + "    " + listWin(window3) + "--     You win $14");
MONEY += 14;
} else if(window1 == 3 && window2 == 3 && window3 == 3){
println(listWin(window1) + "    " + listWin(window2) + "    " + listWin(window3) + "--     You win $10");
MONEY += 10;
} else if(window1 == 3 && window2 == 3 && window3 == 6){
println(listWin(window1) + "    " + listWin(window2) + "    " + listWin(window3) + "--     You win $10");
MONEY += 10;
} else if(window1 == 1 && window2 == 1 && window3 == 1){
println(listWin(window1) + "    " + listWin(window2) + "    " + listWin(window3) + "--    You win $7");
MONEY += 7;
} else if(window1 == 1 && window2 == 1 && window3 != 1){
println(listWin(window1) + "    " + listWin(window2) + "    " + listWin(window3) + "--    You win $5");
MONEY += 5;
} else if(window1 == 1 && window2 != 1 && window3 != 1){
println(listWin(window1) + "    " + listWin(window2) + "    " + listWin(window3) + "-- You win $2");
MONEY += 2;
} else{
println(listWin(window1) + "    " + listWin(window2) + "    " + listWin(window3) + "-- You lose");
}
}
/*
* 用于将随机数和赌博机结果对应。
*/
private  String listWin(int n){
String str = "";
switch(n){
case 1: str = "CHEERY"; break;
case 2: str = "LEMON"; break;
case 3: str = "ORANGE"; break;
case 4: str = "PLUM"; break;
case 5: str = "BELL"; break;
case 6: str = "BAR"; break;
}
return str;
}
/* Create an instance variable for the random number generator */
private RandomGenerator rgen = RandomGenerator.getInstance();
/* private constants */
private int MONEY = 50;
}