All tests passed.

StringParser.java

+import java.lang.*;
 
 /**
  * An introduction to Strings and String methods.
      */
     public static String upperCaseString(String s)
     {
-        return null;
+        return s.toUpperCase();
     }
 
     /**
      * @return String
      */
     public static String lowerCaseString(String s) {
-        return null;
+        return s.toLowerCase();
     }
 
     /**
      * @return String
      */
     public static Character getFirstCharacter(String s) {
-        return null;
+        return s.charAt(0);
     }
 
     /**
      * @return String
      */
     public static Character getNthCharacter(String s, Integer n) {
-        return null;
+        return s.charAt(n);
     }
 
     /**
      * @return String
      */
     public static String upperCaseFirstCharacter(String s) {
-        return null;
+        return s.substring(0,1).toUpperCase() + s.substring(1, s.length());
     }
 
     /**
      * @return String
      */
     public static String camelCaseString(String s) {
-        return null;
+        s = s.toLowerCase();
+        String split[] = s.split(" ");
+        String result = "";
+        for (int i = 0; i < split.length; i++) {
+        split[i].trim();
+        split[i] = split[i].substring(0,1).toUpperCase() + split[i].substring(1);
+        result = result + split[i];
+    }
+        return result;
     }
 
     /**
      * @return String
      */
     public static String snakeCaseString(String s) {
-        return null;
+        return s.toLowerCase().replace(" ", "_");
     }
 
     /**
      * @return String
      */
     public static Integer getLength(String s) {
-        return null;
+        return s.length();
     }
 
     /**
      * @return String
      */
     public static Boolean isEqual(String s1, String s2) {
-        return null;
+        if (s1.compareTo(s2) == 0) {
+        return true;
+    } else {
+        return false;
+    }
     }
 
     /**
      * @return String
      */
     public static Boolean isEqualIgnoreCase(String s1, String s2) {
-        return null;
+        if (s1.compareToIgnoreCase(s2) == 0) {
+        return true; 
+    } else {
+        return false;
+    }
     }
 }

package.bluej

 #BlueJ package file
-#Wed Oct 17 09:06:47 EDT 2018
+editor.fx.0.height=936
+editor.fx.0.width=958
+editor.fx.0.x=504
+editor.fx.0.y=23
+objectbench.height=101
+objectbench.width=466
+package.divider.horizontal=0.6
+package.divider.vertical=0.8338461538461538
+package.editor.height=535
+package.editor.width=364
+package.editor.x=0
+package.editor.y=23
+package.frame.height=708
+package.frame.width=490
+package.numDependencies=0
+package.numTargets=2
+package.showExtends=true
+package.showUses=true
 project.charset=UTF-8
+readme.height=58
+readme.name=@README
+readme.width=47
+readme.x=10
+readme.y=10
+target1.height=50
+target1.name=StringParser
+target1.showInterface=false
+target1.type=ClassTarget
+target1.width=100
+target1.x=140
+target1.y=10
+target2.height=50
+target2.name=StringParserTest
+target2.showInterface=false
+target2.type=UnitTestTargetJunit4
+target2.width=130
+target2.x=70
+target2.y=70