EnumStrategy.java

// The strategy enum pattern
enum PayrollDay {
 MONDAY,
 TUESDAY,
 WEDNESDAY,
 THURSDAY,
 FRIDAY,
 SATURDAY(PayType.WEEKEND), 
 SUNDAY(PayType.WEEKEND);
 
 private final PayType payType;
 
 PayrollDay(PayType payType) {
   this.payType = payType; 
 }
 
 PayrollDay() { 
   this(PayType.WEEKDAY); 
} // Default

int pay(int minutesWorked, int payRate) {
  return payType.pay(minutesWorked, payRate);
}

// The strategy enum type
private enum PayType {
  
  WEEKDAY {
  
    int overtimePay(int minsWorked, int payRate) {
      return minsWorked <= MINS_PER_SHIFT ? 0 : (minsWorked - MINS_PER_SHIFT) * payRate / 2;
    }
  },
  
  WEEKEND {

    int overtimePay(int minsWorked, int payRate) {
      return minsWorked * payRate / 2;
    }
  };

  abstract int overtimePay(int mins, int payRate);

  private static final int MINS_PER_SHIFT = 8 * 60;

  int pay(int minsWorked, int payRate) {
    int basePay = minsWorked * payRate;
    return basePay + overtimePay(minsWorked, payRate);
  }
 }
}