Finished program

src/main/java/org/example/ChargeVerifier.java

@@ -0,0 +1,25 @@
+package org.example;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ChargeVerifier {
+    private static final ArrayList<Integer> VALID_CHARGES = new ArrayList<>(List.of(5658845, 4520125, 7895122, 8777541, 8451277, 1302850, 8080152, 4562555, 5552012, 5050552, 7825877, 1250255, 1005231, 6545231, 3852085, 7576651, 7881200, 4581002));
+
+    public static boolean isValidCharge1(int accountNumber) {
+        return VALID_CHARGES.contains(accountNumber);
+    }
+
+    public static boolean isValidCharge2(int accountNumber) {
+        for (int chargeNum : VALID_CHARGES) {
+            if (accountNumber == chargeNum) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public static boolean isValidCharge3(int accountNumber) {
+        return VALID_CHARGES.stream().anyMatch(i -> accountNumber == i);
+    }
+}

src/main/java/org/example/Main.java

@@ -0,0 +1,164 @@
+package org.example;
+
+import java.text.DecimalFormat;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Main {
+
+    public static void main(String[] args) {
+        helloWorld();
+
+        System.out.println("This will appear in console!");
+
+        int integerVar = 12345;
+        char aSingleLetter = 'A';
+        boolean trueOrFalse = true;
+        String wordVar = "A bunch of text";
+
+        int a = 1 + 2;
+        int b = a - 1;
+        int c = b * a;
+        int d = c / 3;
+
+        System.out.println(a + " : " + b + " : " + c + " : " + d);
+
+        float mpg = milesPerGallon(65, 1.96F);
+        System.out.println(mpg);
+
+        boolean condition = true;
+
+        if (condition) {
+            System.out.println("condition is true");
+        }
+
+        if (condition) {
+            System.out.println("condition is true");
+        } else {
+            System.out.println("condition is false");
+        }
+
+        int intCondition = 1;
+
+        if (intCondition == 0) {
+            System.out.println("The condition matches this first case");
+        } else if (intCondition == 1) {
+            System.out.println("The condition matches a different case");
+        } else {
+            System.out.println("The condition did not match any previous case");
+        }
+
+        int time = secondsCompressor(2837);
+        System.out.println(time);
+
+        int whileI = 0;
+        boolean whileBool = true;
+        while (whileBool) {
+            System.out.println("This is looping!");
+            whileI++;
+            if (whileI > 5) {
+                whileBool = false;
+            }
+        }
+
+        doublePennies(30);
+
+        float retailPrice = calculateRetail(5.00F, 100);
+        System.out.println(retailPrice);
+
+        Person me = new Person("Steven", "123 Main Street", 17, 7175558700L);
+        System.out.println(me);
+
+        Person friend = new Person("Bob", "123 Center Street", 18, 7175559900L);
+        System.out.println(friend);
+
+        Person family = new Person("John", "123 Main Street", 15, 7175558600L);
+        System.out.println(family);
+
+        Person[] people = new Person[3];
+        people[0] = me;
+        people[1] = friend;
+        people[2] = family;
+
+        for (Person person : people) {
+            System.out.println(person);
+        }
+        //for (int i = 0; i < people.length; i++) {
+        //    System.out.println(people.get(i));
+        //}
+
+        System.out.println(averageAges(people));
+
+    }
+
+    public static void helloWorld() {
+        System.out.println("Hello, World!");
+    }
+
+    /**
+     * returns value formatted to 1 decimal place
+     */
+    public static float milesPerGallon(int miles, float fuelUsed) {
+        String value = new DecimalFormat("0.0").format(miles / fuelUsed);
+        return Float.parseFloat(value);
+    }
+
+    /**
+     * Takes seconds and converts them to minutes hours and days if the value is greater than 1
+     */
+    public static int secondsCompressor(int seconds) {
+        if (seconds < 60) {
+            return seconds;
+        } else if (seconds < 3600) {
+            return Math.round(seconds / 60F);
+        } else if (seconds < 86400) {
+            return Math.round(seconds / 3600F);
+        } else {
+            return Math.round(seconds / 86400F);
+        }
+    }
+
+    /**
+     * Don't pass anything higher than 64 days, java can't store longs greater than (insert large number) (i couldnt be bothered to look it up)
+     */
+    public static void doublePennies(int days) {
+        if (days < 0) {
+            return;
+        }
+
+        if (days > 64) {
+            return;
+        }
+
+        long pennies = 1L;
+
+        for (int i = 0; i < days; i++) {
+            pennies *= 2;
+            System.out.println("Day " + (i + 1) + ": " + (pennies / 100D));
+        }
+    }
+
+    /**
+     * Receives the wholesale and markup and returns retail
+     * @param wholeSale wholesale cost in dollar amount
+     * @param markup markup as a percentage
+     * @return float dollar amount rounded as X.XX
+     */
+    public static float calculateRetail(float wholeSale, int markup) {
+        float preRounded = wholeSale * (markup / 100F);
+        String roundedString = new DecimalFormat("0.00").format(preRounded);
+        return Float.parseFloat(roundedString);
+    }
+
+    public static float averageAges(Person[] people) {
+        float ageTotal = 0;
+        float numOfPeople = 0;
+
+        for (Person person : people) {
+            ageTotal += person.getAge();
+            numOfPeople++;
+        }
+
+        return ageTotal / numOfPeople;
+    }
+}

src/main/java/org/example/Person.java

@@ -0,0 +1,52 @@
+package org.example;
+
+public class Person {
+    private String name;
+    private String address;
+    private int age;
+    private long phoneNumber;
+
+    public Person(String name, String address, int age, long phoneNumber) {
+        this.name = name;
+        this.address = address;
+        this.age = age;
+        this.phoneNumber = phoneNumber;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getAddress() {
+        return address;
+    }
+
+    public void setAddress(String address) {
+        this.address = address;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public long getPhoneNumber() {
+        return phoneNumber;
+    }
+
+    public void setPhoneNumber(long phoneNumber) {
+        this.phoneNumber = phoneNumber;
+    }
+
+    @Override
+    public String toString() {
+        return "[ Name: " + name+ ", Address: " + address + ", Age: " + age + ", Phone Number: " + phoneNumber + " ]";
+    }
+}

src/main/java/org/example/TestChargeVerifier.java

@@ -0,0 +1,13 @@
+package org.example;
+
+public class TestChargeVerifier {
+
+    public static void main(String[] args) {
+        System.out.println(ChargeVerifier.isValidCharge1(1234567)); // False
+        System.out.println(ChargeVerifier.isValidCharge1(8080152)); // True
+        System.out.println(ChargeVerifier.isValidCharge2(1234567)); // False
+        System.out.println(ChargeVerifier.isValidCharge2(8080152)); // True
+        System.out.println(ChargeVerifier.isValidCharge3(1234567)); // False
+        System.out.println(ChargeVerifier.isValidCharge3(8080152)); // True
+    }
+}