Modified PayrollDay example from Item 34 (p. 166) to eliminate parameterless

constructore, which ran counter to the purpose of the strategy enum  pattern.
This change corresponds to the forthcoming fourth printing.

Author: jbloch

src/effectivejava/chapter6/item34/PayrollDay.java

@@ -1,21 +1,23 @@
 package effectivejava.chapter6.item34;
 
+import static effectivejava.chapter6.item34.PayrollDay.PayType.*;
+
 // The strategy enum pattern (Page 166)
 enum PayrollDay {
-    MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY,
-    SATURDAY(PayType.WEEKEND), SUNDAY(PayType.WEEKEND);
+    MONDAY(WEEKDAY), TUESDAY(WEEKDAY), WEDNESDAY(WEEKDAY),
+    THURSDAY(WEEKDAY), FRIDAY(WEEKDAY),
+    SATURDAY(WEEKEND), SUNDAY(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 {
+    enum PayType {
         WEEKDAY {
             int overtimePay(int minsWorked, int payRate) {
                 return minsWorked <= MINS_PER_SHIFT ? 0 :
@@ -36,4 +38,9 @@ int pay(int minsWorked, int payRate) {
             return basePay + overtimePay(minsWorked, payRate);
         }
     }
+
+    public static void main(String[] args) {
+        for (PayrollDay day : values())
+            System.out.printf("%-10s%d%n", day, day.pay(8 * 60, 1));
+    }
 }