자바에서 Set 쓰는 이유는 LinkedList는 입력값에 순서가 있지만,
순서없이 그냥 값만 입력하고 그것만 체크하면 더 빠르게 체크하고 그 값만 인식할수있다.
import java.util.*;
public class Lottery {
public static final int pickNum = 6;
public static final int maxNum = 40;
public static void main(String[] args) {
Set<Integer> winningNumbers = generateWinningNumbers();
//System.out.println("Test Winning Num " + winningNumbers);
Set<Integer> ticket = getTicket();
System.out.println();
Set<Integer> checkNum = new TreeSet<Integer>(ticket);
checkNum.retainAll(winningNumbers);
System.out.println("Your numbers are " + ticket);
System.out.println("The winning numbers are " + winningNumbers);
if (checkNum.size() > 0) {
System.out.println("You had " + checkNum.size() + " matching numbers.");
int prize = 250*checkNum.size();
System.out.println("The matched numbers are " + checkNum);
System.out.println("Your prize is $" + prize);
}else {
System.out.println("Sorry, You lost. There are no matching numbers.");
}
}
// make Winning Number.
public static Set<Integer> generateWinningNumbers() {
Set<Integer> winningNumbers = new TreeSet<Integer>();
Random r = new Random();
while (winningNumbers.size() < pickNum) {
int number = r.nextInt(maxNum) + 1;
winningNumbers.add(number);
}
return winningNumbers;
}
// get player Numbers.
public static Set<Integer> getTicket() {
Set<Integer> ticket = new TreeSet<Integer>();
Scanner console = new Scanner(System.in);
System.out.println(" ***** Play Lotto ***** ");
System.out.print("Please Enter 6 lotto numbers between 1 and 40 : ");
while (ticket.size() < pickNum) {
int number = console.nextInt();
ticket.add(number);
}
return ticket;
}
}
/* OutPut
***** Play Lotto *****
Please Enter 6 lotto numbers between 1 and 40 : 1 2 3 4 5 6
Your numbers are [1, 2, 3, 4, 5, 6]
The winning numbers are [11, 13, 14, 15, 38, 39]
Sorry, You lost. There are no matching numbers.
-------------------------------------------------
Test Winning Num [4, 15, 18, 29, 34, 35]
***** Play Lotto *****
Please Enter 6 lotto numbers between 1 and 40 : 4 15 18 29 30 31
Your numbers are [4, 15, 18, 29, 30, 31]
The winning numbers are [4, 15, 18, 29, 34, 35]
You had 4 matching numbers.
The matched numbers are [4, 15, 18, 29]
Your prize is $1000
*/
