add extension

Author: vherus

README.md

@@ -8,6 +8,7 @@
 - Open the root directory of the project in IntelliJ
 - Implement the requirements listed in comments in the `./src/main/java/com.booleanuk/core/Exercise.java` file
 - When ready to test your solution, open the `./src/test/java/com.booleanuk/core/ExerciseTest.java` file and click a "Run Test" button. You can either run the entire test suite via figure 1 in the screenshot below, or run a specific test via figure 2.
+- There is extension work in the `./src/main/java/com.booleanuk/extension/Extension.java` file and tests in the `./src/test/java/com.booleanuk/extension/ExtensionTest.java` file for when you finish the core exercise
 
 ![](./assets/run-a-test.PNG)
 

src/main/java/com/booleanuk/Exercise.java

@@ -1,7 +1,41 @@
 package com.booleanuk.core;
 
 public class Exercise {
-    public static String sayHelloWorld() {
-        return "Hello, world!";
-    }
+    // A URL consists of these parts: [protocol]://[domain]/[path]
+    public String brokenUrl = " httpz://booLeAn.co.uk/who-we-are ";
+
+    // 1. The brokenUrl member above contains an invalid URL. There's a z instead of an s in the protocol (httpz instead of https).
+    // Using the `replace` method on brokenUrl, set the fixedUrl member below to the correct value.
+    // https://docs.oracle.com/en/java/javase/18/docs/api/java.base/java/lang/String.html#replace(char,char)
+    public String fixedUrl = "";
+
+
+    // Here's a documentation link for all string methods, use it to figure out how to complete the rest of these requirements:
+    // https://docs.oracle.com/en/java/javase/18/docs/api/java.base/java/lang/String.html#method-summary
+
+
+    // 2. There are currently some upper case characters in the URL. Using an appropriate string method on the fixedUrl member above,
+    // set the value of lowerCasedUrl.
+    public String lowerCasedUrl = "";
+
+
+    // 3. There is still white space on both ends of the URL! Use the appropriate string method to trim that white space
+    // and set the value of the url member below
+    public String url = "";
+
+
+    // 4. Using the appropriate string method on url, set the value of the protocol member below
+    public String protocol = "";
+
+
+    // 5. Using the appropriate string method on url, set the value of the domain member below
+    public String domain = "";
+
+
+    // 6. Set the length member below to the length of the url member
+    public int length = 0;
+
+
+    // 7. Using concatenation and existing members, set the faqUrl member below to the faq page of the boolean website
+    public String faqUrl = "";
 }

src/main/java/com/booleanuk/core/Exercise.java

@@ -1,7 +1,80 @@
 package com.booleanuk.extension;
 
 public class Extension {
-    public static String sayHelloWorld() {
-        return "Hello, world!";
+    // In Java, Strings are immutable. If we want to change a string, we need to create new variables or members that
+    // contain the new value. Consider the below code that builds a welcome message for a user:
+    String message = "Hello";
+    String message2 = message + ", John Smith!";
+    String message3 = message2 + " Welcome to my app.";
+
+    // As you can see, it's difficult to construct something as simple as a welcome message this way. If we want to
+    // work with a mutable string, we should use another approach. One option is to use the StringBuilder class:
+    // https://docs.oracle.com/en/java/javase/18/docs/api/java.base/java/lang/StringBuilder.html
+
+    // The following block of code is a method. You've been using these during the core criteria, and this is how we
+    // create our own methods. You'll be doing this in a future exercise. For now, write your code between the
+    // WRITE YOUR CODE BETWEEN THIS LINE...
+    // ... AND THIS LINE
+    // See the below example:
+    public void example() {
+        // 0. Print the word "Hello"
+        // WRITE YOUR CODE BETWEEN THIS LINE...
+        System.out.println("Hello");
+        // ...AND THIS LINE
+    }
+
+    public StringBuilder one() {
+        StringBuilder sb = new StringBuilder();
+
+        // 1. Using the sb variable above, add "Hello, world!" to the StringBuilder
+        // WRITE YOUR CODE BETWEEN THIS LINE...
+
+
+
+        // ...AND THIS LINE
+
+        return sb;
+    }
+
+    public StringBuilder two() {
+        StringBuilder sb = new StringBuilder();
+
+        // 1. Using the sb variable above, add "Hello, world!" to the StringBuilder
+        // 2. After adding the message, reverse it
+        // WRITE YOUR CODE BETWEEN THIS LINE...
+
+
+
+        // ...AND THIS LINE
+
+        return sb;
+    }
+
+    public StringBuilder three() {
+        StringBuilder sb = new StringBuilder();
+
+        // 1. Using the sb variable above, add "Hello, world!" to the StringBuilder
+        // 2. After adding the message, remove the comma.
+        // WRITE YOUR CODE BETWEEN THIS LINE...
+
+
+
+        // ...AND THIS LINE
+
+        return sb;
+    }
+
+    public StringBuilder four() {
+        StringBuilder sb = new StringBuilder();
+
+        // 1. Using the sb variable above, add "Hello, world!" to the StringBuilder
+        // 2. After adding the message, replace the word "world" with the word "Java"
+        // WRITE YOUR CODE BETWEEN THIS LINE...
+
+
+
+        // ...AND THIS LINE
+
+        return sb;
     }
 }

src/main/java/com/booleanuk/extension/Extension.java

@@ -1,12 +1,47 @@
 package com.booleanuk.core;
 
-import com.booleanuk.core.Exercise;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
 class ExerciseTest {
+    Exercise exercise;
+
+    public ExerciseTest() {
+        this.exercise = new Exercise();
+    }
+
+    @Test
+    public void urlShouldBeFixed() {
+        Assertions.assertEquals(" https://booLeAn.co.uk/who-we-are ", this.exercise.fixedUrl);
+    }
+
+    @Test
+    public void urlShouldBeLowerCase() {
+        Assertions.assertEquals(" https://boolean.co.uk/who-we-are ", this.exercise.lowerCasedUrl);
+    }
+
+    @Test
+    public void urlShouldBeTrimmed() {
+        Assertions.assertEquals("https://boolean.co.uk/who-we-are", this.exercise.url);
+    }
+
+    @Test
+    public void protocolShouldBeHttps() {
+        Assertions.assertEquals("https", this.exercise.protocol);
+    }
+
+    @Test
+    public void domainShouldBeBooleanCoUk() {
+        Assertions.assertEquals("boolean.co.uk", this.exercise.domain);
+    }
+
+    @Test
+    public void lengthShouldBe32() {
+        Assertions.assertEquals(32, this.exercise.length);
+    }
+
     @Test
-    public void shouldSayHelloWorld() {
-        Assertions.assertEquals("Hello, world!", Exercise.sayHelloWorld());
+    public void faqUrlShouldBeBooleanCoUkFaq() {
+        Assertions.assertEquals("https://boolean.co.uk/faq", this.exercise.faqUrl);
     }
 }

src/test/java/com/booleanuk/ExerciseTest.java

@@ -4,8 +4,29 @@
 import org.junit.jupiter.api.Test;
 
 public class ExtensionTest {
+    Extension extension;
+
+    public ExtensionTest() {
+        this.extension = new Extension();
+    }
+
+    @Test
+    public void helloWorldShouldBeAppended() {
+        Assertions.assertEquals("Hello, world!", this.extension.one().toString());
+    }
+
+    @Test
+    public void helloWorldShouldBeReversed() {
+        Assertions.assertEquals("!dlrow ,olleH", this.extension.two().toString());
+    }
+
+    @Test
+    public void commaShouldBeRemoved() {
+        Assertions.assertEquals("Hello world!", this.extension.three().toString());
+    }
+
     @Test
-    public void shouldSayHelloWorld() {
-        Assertions.assertEquals("Hello, world!", Extension.sayHelloWorld());
+    public void shouldSayHelloToJava() {
+        Assertions.assertEquals("Hello, Java!", this.extension.four().toString());
     }
 }