Minor refactorings and code style changes (#807)

* Made minor changes in some patterns such as removed throws clause where not needed, changed incorrect order of arguments in assertEquals

* Minor refactorings and code style changes. 1) Removed several use of raw types 2) Removed unnecessary throws clauses 3) Used lambda expressions wherever applicable 4) Used apt assertion methods for readability 5) Use of try with resources wherever applicable 6) Corrected incorrect order of assertXXX arguments

* Removed unused import from Promise

* Addressed review comments

* Addressed checkstyle issue

prototype/src/main/java/com/iluwatar/prototype/ElfBeast.java

@@ -40,7 +40,7 @@ public class ElfBeast extends Beast {
   }
 
   @Override
-  public Beast copy() throws CloneNotSupportedException {
+  public Beast copy() {
     return new ElfBeast(this);
   }
 

prototype/src/main/java/com/iluwatar/prototype/ElfMage.java

@@ -41,7 +41,7 @@ public class ElfMage extends Mage {
   }
 
   @Override
-  public ElfMage copy() throws CloneNotSupportedException {
+  public ElfMage copy() {
     return new ElfMage(this);
   }
 

prototype/src/main/java/com/iluwatar/prototype/ElfWarlord.java

@@ -40,7 +40,7 @@ public class ElfWarlord extends Warlord {
   }
 
   @Override
-  public ElfWarlord copy() throws CloneNotSupportedException {
+  public ElfWarlord copy() {
     return new ElfWarlord(this);
   }
 

prototype/src/main/java/com/iluwatar/prototype/OrcBeast.java

@@ -40,7 +40,7 @@ public class OrcBeast extends Beast {
   }
 
   @Override
-  public Beast copy() throws CloneNotSupportedException {
+  public Beast copy() {
     return new OrcBeast(this);
   }
 

prototype/src/main/java/com/iluwatar/prototype/OrcMage.java

@@ -40,7 +40,7 @@ public class OrcMage extends Mage {
   }
 
   @Override
-  public OrcMage copy() throws CloneNotSupportedException {
+  public OrcMage copy() {
     return new OrcMage(this);
   }
 

prototype/src/main/java/com/iluwatar/prototype/OrcWarlord.java

@@ -40,7 +40,7 @@ public class OrcWarlord extends Warlord {
   }
 
   @Override
-  public OrcWarlord copy() throws CloneNotSupportedException {
+  public OrcWarlord copy() {
     return new OrcWarlord(this);
   }