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Refactor scoreHand and compareHands into ScoringUtils

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This commit is contained in:
Dave Burke
2022-03-03 21:55:30 -06:00
parent 1f24d98a72
commit f7a257e6ae
4 changed files with 198 additions and 251 deletions
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53
10_Blackjack/java/src/Game.java
View File

@@ -152,7 +152,7 @@ public class Game {
if(action.equalsIgnoreCase("H")){ // HIT
Card c = deck.deal();
player.dealCard(c, handNumber);
if(scoreHand(player.getHand(handNumber)) > 21){
if(ScoringUtils.scoreHand(player.getHand(handNumber)) > 21){
userIo.println("...BUSTED");
break;
}
@@ -162,7 +162,7 @@ public class Game {
} else if(action.equalsIgnoreCase("D") && player.canDoubleDown(handNumber)) { // DOUBLE DOWN
Card c = deck.deal();
player.doubleDown(c, handNumber);
if(scoreHand(player.getHand(handNumber)) > 21){
if(ScoringUtils.scoreHand(player.getHand(handNumber)) > 21){
userIo.println("...BUSTED");
break;
}
@@ -206,54 +206,7 @@ public class Game {
}
}
}
userIo.println("TOTAL IS " + scoreHand(player.getHand(handNumber)));
}
/**
* Calculates the value of a hand. When the hand contains aces, it will
* count one of them as 11 if that does not result in a bust.
*
* @param hand the hand to evaluate
* @return The numeric value of a hand. A value over 21 indicates a bust.
*/
protected int scoreHand(List<Card> hand){
int nAces = (int) hand.stream().filter(c -> c.getValue() == 1).count();
int value = hand.stream()
.mapToInt(Card::getValue)
.filter(v -> v != 1) // start without aces
.map(v -> v > 10 ? 10 : v) // all face cards are worth 10. The 'expr ? a : b' syntax is called the 'ternary operator'
.sum();
value += nAces; // start by treating all aces as 1
if(nAces > 0 && value <= 11) {
value += 10; // We can use one of the aces to an 11
// You can never use more than one ace as 11, since that would be 22 and a bust.
}
return value;
}
/**
* Compares two hands accounting for natural blackjacks using the
* java.lang.Comparable convention of returning positive or negative integers
*
* @param handA hand to compare
* @param handB other hand to compare
* @return a negative integer, zero, or a positive integer as handA is less than, equal to, or greater than handB.
*/
protected int compareHands(List<Card> handA, List<Card> handB) {
int scoreA = this.scoreHand(handA);
int scoreB = this.scoreHand(handB);
if(scoreA == 21 && scoreB == 21){
if(handA.size() == 2 && handB.size() != 2){
return 1; //Hand A wins with a natural blackjack
} else if (handA.size() != 2 && handB.size() == 2) {
return -1; //Hand B wins with a natural blackjack
} else {
return 0; //Tie
}
} else {
return Integer.compare(scoreA, scoreB);
}
userIo.println("TOTAL IS " + ScoringUtils.scoreHand(player.getHand(handNumber)));
}
/**

52
10_Blackjack/java/src/ScoringUtils.java Normal file
View File

@@ -0,0 +1,52 @@
import java.util.List;
public final class ScoringUtils {
/**
* Calculates the value of a hand. When the hand contains aces, it will
* count one of them as 11 if that does not result in a bust.
*
* @param hand the hand to evaluate
* @return The numeric value of a hand. A value over 21 indicates a bust.
*/
public static final int scoreHand(List<Card> hand){
int nAces = (int) hand.stream().filter(c -> c.getValue() == 1).count();
int value = hand.stream()
.mapToInt(Card::getValue)
.filter(v -> v != 1) // start without aces
.map(v -> v > 10 ? 10 : v) // all face cards are worth 10. The 'expr ? a : b' syntax is called the 'ternary operator'
.sum();
value += nAces; // start by treating all aces as 1
if(nAces > 0 && value <= 11) {
value += 10; // We can use one of the aces to an 11
// You can never use more than one ace as 11, since that would be 22 and a bust.
}
return value;
}
/**
* Compares two hands accounting for natural blackjacks using the
* java.lang.Comparable convention of returning positive or negative integers
*
* @param handA hand to compare
* @param handB other hand to compare
* @return a negative integer, zero, or a positive integer as handA is less than, equal to, or greater than handB.
*/
public static final int compareHands(List<Card> handA, List<Card> handB) {
int scoreA = scoreHand(handA);
int scoreB = scoreHand(handB);
if(scoreA == 21 && scoreB == 21){
if(handA.size() == 2 && handB.size() != 2){
return 1; //Hand A wins with a natural blackjack
} else if (handA.size() != 2 && handB.size() == 2) {
return -1; //Hand B wins with a natural blackjack
} else {
return 0; //Tie
}
} else {
return Integer.compare(scoreA, scoreB);
}
}
}