done

src/main/java/HamletParser.java

 import java.io.File;
 import java.io.IOException;
+import java.nio.file.Files;
+import java.util.List;
 import java.util.Scanner;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 /**
  * Created by thook on 10/7/15.
 
     private String hamletData;
 
+
     public HamletParser(){
         this.hamletData = loadFile();
     }
             while(scanner.hasNextLine()){
                 String line = scanner.nextLine();
                 result.append(line).append("\n");
-            }
 
+            }
             scanner.close();
         }catch(IOException e){
             e.printStackTrace();
         }
-
+        System.out.println(result.toString());
         return result.toString();
     }
 
         return hamletData;
     }
 
+    public void replaceHamlet(){
+        Pattern pattern = Pattern.compile("Hamlet", Pattern.CASE_INSENSITIVE);
+        Matcher matcher = pattern.matcher(hamletData);
+        hamletData = matcher.replaceAll("Leon");
+    }
+
+    public void replaceHoratio(){
+        Pattern pattern = Pattern.compile("Horatio", Pattern.CASE_INSENSITIVE);
+        Matcher matcher = pattern.matcher(hamletData);
+        hamletData = matcher.replaceAll("Tariq");
+    }
+
+    public boolean findHamlet() {
+        Pattern pattern = Pattern.compile("Hamlet",Pattern.CASE_INSENSITIVE);
+        Matcher matcher = pattern.matcher(hamletData);
+        return matcher.find();
+    }
+
+    public boolean findHoratio() {
+        Pattern pattern = Pattern.compile("Horatio",Pattern.CASE_INSENSITIVE);
+        Matcher matcher = pattern.matcher(hamletData);
+        return matcher.find();
+    }
 }

src/test/java/HamletParserTest.java

+import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 
+import java.util.stream.Stream;
+
 import static org.junit.Assert.*;
 
 public class HamletParserTest {
 
     @Test
     public void testChangeHamletToLeon() {
+        hamletParser.replaceHamlet();
+        Assert.assertFalse(hamletParser.findHamlet());
     }
 
+
     @Test
     public void testChangeHoratioToTariq() {
+        hamletParser.replaceHoratio();
+        Assert.assertFalse(hamletParser.findHoratio());
     }
 
     @Test
     public void testFindHoratio() {
+
+        Assert.assertTrue(hamletParser.findHoratio());
     }
 
     @Test
     public void testFindHamlet() {
+
+        Assert.assertTrue(hamletParser.findHamlet());
     }
 }