generic

src/main/java/com/vectron/fcl/FclStack.java

@@ -15,7 +15,7 @@ import java.util.List;
 
 public class FclStack {
     private static final Gson gson;
-    private final LStack stack = new LStack();
+    private final LStack<Obj> stack = new LStack<>();
 
     static {
         FclTypeAdapter typeAdapter = new FclTypeAdapter();

src/main/java/com/vectron/fcl/Juggler.java

@@ -14,8 +14,8 @@ import java.util.Set;
 public class Juggler {
     private final List<Obj> input;
     private final List<Obj> output;
-    private final LStack stack;
-    private final LStack rstack;
+    private final LStack<Obj> stack;
+    private final LStack<Obj> rstack;
     private final Set<Obj> uniqueOutput;
     private final List<Integer> code;
     private final List<Word> availableWords;
@@ -81,8 +81,8 @@ public class Juggler {
         this.output = output;
         this.maxSteps = maxSteps;
         this.uniqueOutput = new HashSet<>(output);
-        this.stack = new LStack();
-        this.rstack = new LStack();
+        this.stack = new LStack<>();
+        this.rstack = new LStack<>();
         this.code = new ArrayList<>();
         this.availableWords = populateWords(excluded);
         this.code.add(0);

src/main/java/com/vectron/fcl/LStack.java

@@ -1,31 +1,29 @@
 package com.vectron.fcl;
 
-import com.vectron.fcl.types.Obj;
-
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.EmptyStackException;
 
-public final class LStack extends ArrayList<Obj> {
+public final class LStack<T> extends ArrayList<T> {
     public LStack() {
         super(10);
     }
 
-    public LStack(final Collection<Obj> collection) {
+    public LStack(final Collection<T> collection) {
         super(collection);
     }
 
-    public void push(Obj item) {
+    public void push(T item) {
         add(item);
     }
 
-    public Obj pop() {
-        Obj top = peek();
+    public T pop() {
+        T top = peek();
         remove(size() - 1);
         return top;
     }
 
-    public Obj peek() {
+    public T peek() {
         int size = size();
         if (size == 0) throw new EmptyStackException();
         return get(size - 1);