init

.gitignore

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+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff:
+.idea/**
+.idea/**/tasks.xml
+.idea/dictionaries
+
+# Sensitive or high-churn files:
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.xml
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+
+# Gradle:
+.idea/**/gradle.xml
+.idea/**/libraries
+
+*.iml
+# CMake
+cmake-build-debug/
+
+# Mongo Explorer plugin:
+.idea/**/mongoSettings.xml
+
+## File-based project format:
+*.iws
+
+## Plugin-specific files:
+
+# IntelliJ
+/out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+.project
+.classpath
+.settings
+target

README.MD

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+# Polymorphism Payment Lab
+
+## Objectives
+
+- To learn [interface](https://docs.oracle.com/javase/tutorial/java/concepts/interface.html)
+- To learn `Comparable` interface
+- To learn [lambda function](https://docs.oracle.com/javase/tutorial/java/javaOO/lambdaexpressions.html)
+
+# Section 1 - Setting up the classes
+## Part 1 - Payment
+1. Create a `Payment` interface
+  - The class should define a `getId()` method which returns a Long
+  - The class should define a `getPayerName()` method which returns a String
+  - The class should define a `getShortDescription` method which returns a String
+
+## Part 2 - Credit Card
+1. Create a `CreditCardTest` test class
+2. Create a `CreditCard` class which implements the `Payment` interface
+3. Add the required methods from the interface
+4. Add getter and setter test for an id
+  - Add a Long id field
+  - Add a getter and setter method to make the test pass
+5. Repeat step 4 for the following fields:
+  - String payerName
+  - String number
+  - int expiredMonth
+  - int expiredYear
+6. Implement the `getShortDescription` to return `CC [payerName] [last 4 digit of the number] [expiredMonth]/[expiredYear]`
+  - ex: `CC Tia Mowry 4551 10/2019`
+7. You may create any type of constructor or methods that will with this lab
+
+## Part 3 - Check
+1. Create a `CheckTest` test class
+2. Create a `Check` class which implements the `Payment` interface
+3. Add the required methods from the interface
+4. Add getter and setter test for an id
+  - Add a Long id field
+  - Add a getter and setter method to make the test pass
+5. Repeat step 4 for the following fields:
+  - String payerName
+  - String routing number
+  - String accountNumber
+6. Implement the `getShortDescription` to return `Check [payerName] ***[last 4 digit of the account]`
+  - ex: `Check Tia Mowry ***4551`
+7. You may create any type of constructor or methods that will with this lab
+
+## Part 4 - Paypal
+1. Create a `PayPalTest` test class
+2. Create a `PayPal` class which implements the `Payment` interface
+3. Add the required methods from the interface
+4. Add getter and setter test for an id
+  - Add a Long id field
+  - Add a getter and setter method to make the test pass
+5. Repeat step 4 for the following fields:
+  - String payerName
+  - String email
+6. Implement the `getShortDescription` to return `Paypal [payerName] [email]`
+  - ex: `Paypal Tia Mowry tia@mowry.com`
+7. You may create any type of constructor or methods that will with this lab
+
+# Section 2 - Comparable
+Note: You may use the String/Long compareTo methods in your code
+1. Edit the `Payment` class to extends the Comparable interface
+  - `public class Payment extends Comparable<Payment>`
+  - This indicate that payment can be comparable, which means it can be sorted
+2. Fix the syntax error in your CreditCard, Check, and Paypal class by adding the compare method
+3. Create a test for the `compareTo` method. Compare using the getShortDescription()
+  - Example: Given Payment of type Paypal with the short description of `Paypal Tia Mowry tia@mowry.com` and a Check with the short description of `Check Tia Mowry ***4551`, then the `compareTo` method should return a number larger than 0
+  - The `compareTo` method will return number larger than 0 if this payment comes after payment2
+  - The `compareTo` method will return number 0 if this payment has the same information
+  - The `compareTo` method will return number less than 0 if this payment comes before payment2
+4. Add the code necessary to make the test pass
+5. Create a new `PaymentSortByPayer` class which implements `java.util.Comparator`
+  - This class will sort by payer name
+  - `public class PaymentSortByPayer implements Comparator<Payment>`
+6. Add the required `compare` method from the Comparator
+7. Create a test to compare two payment
+    - The `compare` method will return number larger than 0 if payment1 comes after payment2
+    - The `compare` method will return number 0 if the payment has the same information
+    - The `compare` method will return number less than 0 if payment1 comes before payment2
+
+# Section 3 - PaymentPresenter
+1. Create a `PaymentPresenterTest`
+2. Create a test case to test the `toString` method of the PaymentPresenter class
+  - When there is no payment
+    ```
+      Payment[] payments = new Payment[0];
+      PaymentPresenter presenter = new PaymentPresenter();
+      String expected = "";
+
+      String actual = presenter.toString(payments);
+
+      assertEquals(expected, actual);
+    ```
+  - When there are multiple payments, you need to sort it first, then build the string using the short description
+  ```
+    Payment[] payments = new Payment[2];
+    Payment paypal = new PayPayl(4L, "Tia Mowry", "tia@mowry.com");
+    Payment check = new Check(81L, "Tia Mowry", "11432543", "134344551")
+
+    payment[0] = paypal;
+
+    PaymentPresenter presenter = new PaymentPresenter();
+    String expected = "Check Tia Mowry ***4551\nPaypal Tia Mowry tia@mowry.com\n";
+
+    String actual = presenter.toString(payments);
+    assertEquals(expected, actual);
+  ```
+  3. Create a test case to test the `toStringByPayerName` method of the PaymentPresenter class
+    - When there are multiple payments, you need to sort by calling the `PaymentSortByPayer` class to sort, then build the string using the short description
+    ```
+      Payment[] payments = new Payment[2];
+      Payment paypal = new PayPayl(4L, "Tamara Mowry", "tamara@mowry.com");
+      Payment check = new Check(81L, "Tia Mowry", "11432543", "134344551")
+
+      payment[0] = paypal;
+
+      PaymentPresenter presenter = new PaymentPresenter();
+      String expected = "Paypal Tamara Mowry tamara@mowry.com\nCheck Tia Mowry ***4551\n";
+
+      String actual = presenter.toString(payments);
+      assertEquals(expected, actual);
+    ```
+  4. Create a test case to test the `toStringById` method of the PaymentPresenter class
+    - When there are multiple payments, you need to sort by creating a lambda to sort the payment by id, then build the string using the short description
+    ```
+      Payment[] payments = new Payment[2];
+      Payment paypal = new PayPayl(120L, "Tamara Mowry", "tamara@mowry.com");
+      Payment check = new Check(81L, "Tia Mowry", "11432543", "134344551")
+
+      payment[0] = paypal;
+
+      PaymentPresenter presenter = new PaymentPresenter();
+      String expected = "Paypal Tamara Mowry tamara@mowry.com\nCheck Tia Mowry ***4551\n";
+
+      String actual = presenter.toString(payments);
+      assertEquals(expected, actual);
+    ```

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.zipcoder</groupId>
+    <artifactId>payment</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+
+</project>

src/main/java/com/zipcoder/payment/PaymentPresenter.java

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+package com.zipcoder.payment;
+
+public class PaymentPresenter {
+
+
+}

src/test/java/com/zipcoder/payment/PaymentPresenterTest.java

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+package com.zipcoder.payment;
+
+public class PaymentPresenterTest {
+}