Exercise One

src/main/java/com/serenitydojo/HelloWorldWriter.java

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+package com.serenitydojo;
+
+public class HelloWorldWriter {
+
+    public void writeHelloWorld() {
+        System.out.println("Hello World!");
+
+    }
+
+
+
+}

src/test/java/com/serenitydojo/HelloWorldWriterTest.java

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+package com.serenitydojo;
+
+import org.junit.Test;
+
+public class HelloWorldWriterTest {
+
+   @Test
+    public void shouldwriteHelloWorldToTheConsole() {
+       HelloWorldWriter writer = new HelloWorldWriter();
+       writer.writeHelloWorld();
+
+   }
+
+    @Test
+    public void declaringNumericalVariables() {
+
+        int ageThisYear = 42;
+
+        int ageNextYear = ageThisYear + 3;
+
+        System.out.println("age =" + ageNextYear);
+    }
+
+
+}

src/test/java/com/serenitydojo/NewExercise.java

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+package com.serenitydojo;
+
+import org.junit.Test;
+
+public class NewExercise {
+    @Test
+    public void convertToLowerCase(){
+  //Converting to lower case
+        String bookTitle = "THE CAT IN THE HAT";
+
+        String lowerCaseTitle = bookTitle.toLowerCase();
+
+        System.out.println(lowerCaseTitle);
+
+    }
+
+    @Test
+    public void convertToUpperCase(){
+        //Converting to upper case
+              String bookTitle = "the cat in the hat";
+
+              String upperCaseTitle = bookTitle.toUpperCase();
+
+              System.out.println(upperCaseTitle);
+    }
+
+    @Test
+    public void trimExtraSpace(){
+        //Trim extra space
+
+            String bookTitle = "  The Cat In The Hat  ";
+
+            String str = "  The Cat In The Hat  ";
+
+            System.out.println(str);
+
+            System.out.println(str.trim());
+
+    }
+
+       @Test
+        public void findingTheLengthOfaString(){
+            // Finding The Length Of A String
+
+           String bookTitle = "The Cat In The Hat";
+
+           int stringSize= bookTitle.length();
+
+           System.out.println(bookTitle);
+
+       }
+
+
+    @Test
+    public void replacingTextInAstring() {
+        //Replacing text in a string
+
+       String  bookTitle= "The Cat In The Hat";
+
+       String updatedTitle = bookTitle.replace("Hat", "Basket");
+
+       System.out.println(updatedTitle);
+
+    }
+
+
+     }