enums

src/enums/enums.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="jdk" jdkName="openjdk-24" jdkType="JavaSDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

src/enums/src/Main.java

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+public class Main {
+    public static void main(String[] args) {
+    }
+}

src/enums/src/Month.java

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+public enum Month {
+
+    JANUARY(31),
+    FEBRUARY(28),
+    MARCH(31),
+    APRIL(30),
+    MAY(31),
+    JUNE(30),
+    JULY(31),
+    AUGUST(31),
+    SEPTEMBER(30),
+    OCTOBER(31),
+    NOVEMBER(30),
+    DECEMBER(31);
+
+    private int daysInMonth;
+
+    private Month(int daysInMonth) {
+        this.daysInMonth = daysInMonth;
+    }
+
+    public int getDaysInMonth() {
+        return daysInMonth;
+    }
+
+
+    public int getMonthNum() {
+        return ordinal() + 1;
+    }
+
+    public static int howManyDaysBefore(Month month, int dayInMonth) {
+        int daysBefore = 0;
+        Month[] arr = Month.values();
+        for (int i = 0; i < month.ordinal(); i++) {
+            daysBefore += arr[i].getDaysInMonth();
+        }
+        return daysBefore+dayInMonth-1;
+    }
+
+    public static Month whichMonth(int currentDay) {
+        Month[] arr = Month.values();
+        int totalDays = 0;
+        int count = 0;
+        while(totalDays < currentDay) {
+            totalDays += arr[count].getDaysInMonth();
+            count++;
+        }
+        return arr[count-1];
+    }
+
+}

src/enums/src/Supermarket.java

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+public enum Supermarket {
+
+    CHEESE("cheese", 5),
+    WATER_BOTTLE("water bottle" , 3),
+    OIL_BOTTLE( "oil bottle", 10),
+    SUGAR("sugar",7);
+
+    private int productsPrice;
+    private String name;
+
+    private Supermarket (String name, int productsPrice) {
+        this.productsPrice = this.productsPrice;
+        this.name = name;
+    }
+
+    public static int sumPrice(Supermarket[] arr, int [] sizes) {
+        int priceOfAll = 0;
+        for (int i = 0; i < arr.length ; i++) {
+            priceOfAll += arr[i].productsPrice*sizes[i];
+        }
+        return priceOfAll;
+    }
+
+}