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1. å°èŠæš¡ã§é »ç¹ãªãªãã¡ã¯ã¿ãªã³ã°
ãªãã¡ã¯ã¿ãªã³ã°ãžã®æåã®ã¢ãããŒãã¯ãå°ããé »ç¹ãªã¹ãããã§è¡ãããšã§ããããã«ããã倿Žã®ãã¹ããšæ€èšŒã容æã«ãªããæ°ããªãã°ãå°å ¥ãããªã¹ã¯ãæžå°ããŸãããªãã¡ã¯ã¿ãªã³ã°ãæ¥åžžã®éçºã¯ãŒã¯ãããŒã«çµ±åããŸãããã
äŸïŒ 倧ããªã¯ã©ã¹ãäžåºŠã«æžãçŽãããšããã®ã§ã¯ãªããããå°ãã管çããããã¹ãããã«åè§£ããŸããåäžã®ã¡ãœããããªãã¡ã¯ã¿ãªã³ã°ããããæ°ããã¯ã©ã¹ãæœåºãããã倿°ããªããŒã ãããããŸããå倿Žã®åŸã«ãã¹ããå®è¡ããäœãå£ããŠããªãããšã確èªããŸãã
2. ããŒã€ã¹ã«ãŠãã«ãŒã«
ããŒã€ã¹ã«ãŠãã«ãŒã«ã¯ããæ¥ããšãããããããã«ããŠå»ãããšãããã®ã§ããã³ãŒãã®äžéšãäœæ¥ããéã¯ãã€ã§ããå°ãæéããããŠãããæ¹åããŸããããã¿ã€ããä¿®æ£ãããã倿°ããªããŒã ããããã¡ãœãããæœåºãããããŸããæéãçµã€ã«ã€ããŠããããã®å°ããªæ¹åãã³ãŒãå質ã®å€§å¹ ãªåäžã«ã€ãªãããŸãã
äŸïŒ ã¢ãžã¥ãŒã«å ã®ãã°ãä¿®æ£ããŠãããšãã«ãã¡ãœããåãäžæç¢ºã§ããããšã«æ°ã¥ããŸãããã®ç®çãããããåæ ããããã«ã¡ãœããããªããŒã ããŸãããã®åçŽãªå€æŽã«ãããã³ãŒããçè§£ãããããä¿å®ãããããªããŸãã
3. ã¡ãœããã®æœåº
ãã®ãã¯ããã¯ã¯ãã³ãŒãã®ãããã¯ãæ°ããã¡ãœããã«ç§»åãããããšãå«ã¿ãŸããããã«ãããã³ãŒãã®éè€ãæžãããå¯èªæ§ãåäžãããã³ãŒãã®ãã¹ãã容æã«ããããšãã§ããŸãã
äŸïŒ 次ã®Javaã³ãŒãã¹ãããããèããŠã¿ãŸãããïŒ
public void processOrder(Order order) {
// Calculate the total amount
double totalAmount = 0;
for (OrderItem item : order.getItems()) {
totalAmount += item.getPrice() * item.getQuantity();
}
// Apply discount
if (order.getCustomer().isEligibleForDiscount()) {
totalAmount *= 0.9;
}
// Send confirmation email
String email = order.getCustomer().getEmail();
String subject = "Order Confirmation";
String body = "Your order has been placed successfully.";
sendEmail(email, subject, body);
}
åèšéé¡ã®èšç®ãå¥ã®ã¡ãœããã«æœåºã§ããŸãïŒ
public void processOrder(Order order) {
double totalAmount = calculateTotalAmount(order);
// Apply discount
if (order.getCustomer().isEligibleForDiscount()) {
totalAmount *= 0.9;
}
// Send confirmation email
String email = order.getCustomer().getEmail();
String subject = "Order Confirmation";
String body = "Your order has been placed successfully.";
sendEmail(email, subject, body);
}
private double calculateTotalAmount(Order order) {
double totalAmount = 0;
for (OrderItem item : order.getItems()) {
totalAmount += item.getPrice() * item.getQuantity();
}
return totalAmount;
}
4. ã¯ã©ã¹ã®æœåº
ãã®ãã¯ããã¯ã¯ãããã¯ã©ã¹ã®è²¬ä»»ã®äžéšãæ°ããã¯ã©ã¹ã«ç§»åãããããšãå«ã¿ãŸããããã«ãããå ã®ã¯ã©ã¹ã®è€éãã軜æžããããçŠç¹ãçµã£ããã®ã«ããããšãã§ããŸãã
äŸïŒ 泚æåŠçãšé¡§å®¢ãšã®ã³ãã¥ãã±ãŒã·ã§ã³ã®äž¡æ¹ãæ±ãã¯ã©ã¹ã¯ã`OrderProcessor`ãš`CustomerCommunicator`ã®2ã€ã®ã¯ã©ã¹ã«åå²ããããšãã§ããŸãã
5. æ¡ä»¶åå²ãããªã¢ãŒãã£ãºã ã§çœ®ãæãã
ãã®ãã¯ããã¯ã¯ãè€éãªæ¡ä»¶æïŒäŸãã°ã倧ããª`if-else`ãã§ãŒã³ïŒãããªã¢ãŒãã£ãã¯ãªè§£æ±ºçã§çœ®ãæããããšãå«ã¿ãŸããããã«ãããã³ãŒããããæè»ã§æ¡åŒµãããããªããŸãã
äŸïŒ 補åã®çš®é¡ã«åºã¥ããŠç°ãªãçš®é¡ã®çšéãèšç®ããå¿ èŠãããç¶æ³ãèããŠã¿ãŸãããã倧ããª`if-else`æã䜿çšãã代ããã«ã補åã¿ã€ãããšã«ç°ãªãå®è£ ãæã€`TaxCalculator`ã€ã³ã¿ãŒãã§ãŒã¹ãäœæã§ããŸããPythonã§ã®äŸïŒ
class TaxCalculator:
def calculate_tax(self, price):
pass
class ProductATaxCalculator(TaxCalculator):
def calculate_tax(self, price):
return price * 0.1
class ProductBTaxCalculator(TaxCalculator):
def calculate_tax(self, price):
return price * 0.2
# Usage
product_a_calculator = ProductATaxCalculator()
tax = product_a_calculator.calculate_tax(100)
print(tax) # Output: 10.0
6. ãã¶ã€ã³ãã¿ãŒã³ã®å°å ¥
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äŸïŒ ç°ãªãæ¯æãæ¹æ³ãåŠçããããã«Strategyãã¿ãŒã³ã䜿çšããŸãã忝æãæ¹æ³ïŒäŸïŒã¯ã¬ãžããã«ãŒããPayPalïŒã¯å¥ã®æŠç¥ãšããŠå®è£ ã§ããããã«ãããäžæ žãšãªãæ¯æãåŠçããžãã¯ã倿Žããããšãªããæ°ããæ¯æãæ¹æ³ãç°¡åã«è¿œå ã§ããŸãã
7. ããžãã¯ãã³ããŒãååä»ã宿°ã§çœ®ãæãã
ããžãã¯ãã³ããŒïŒèª¬æã®ãªãæ°å€ãªãã©ã«ïŒã¯ãã³ãŒããçè§£ãã«ãããä¿å®ãã«ããããŸããããããæå³ãæç¢ºã«èª¬æããååä»ã宿°ã§çœ®ãæããŸãããã
äŸïŒ ã³ãŒãå ã§`if (age > 18)`ã䜿çšãã代ããã«ã宿°`const int ADULT_AGE = 18;`ãå®çŸ©ãã`if (age > ADULT_AGE)`ã䜿çšããŸããããã«ãããã³ãŒããèªã¿ããããªããå°æ¥æäººã®å¹Žéœ¢ã倿Žãããå Žåã§ãæŽæ°ã容æã«ãªããŸãã
8. æ¡ä»¶åŒã®åè§£
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äŸïŒ é·ã`if-else`ãã§ãŒã³ãæã€åäžã®ã¡ãœããã®ä»£ããã«ãæ¡ä»¶ã®ååå²ã«å¯ŸããŠå¥ã ã®ã¡ãœãããäœæããŸããåã¡ãœããã¯ç¹å®ã®æ¡ä»¶ãåŠçããé©åãªçµæãè¿ãã¹ãã§ãã
9. ã¡ãœããã®ãªããŒã
äžé©åã«åä»ããããã¡ãœããã¯ãæ··ä¹±ãæãã誀解ãæãå¯èœæ§ããããŸããã¡ãœããã®ç®çãšæ©èœãæ£ç¢ºã«åæ ããããã«ãªããŒã ããŸãããã
äŸïŒ `processData`ãšããååã®ã¡ãœããã¯ããã®è²¬ä»»ãããããåæ ããããã«`validateAndTransformData`ã«ãªããŒã ããããšãã§ããŸãã
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