added better comments

src/main/java/com/reliancy/util/JointIterator.java

@@ -0,0 +1,35 @@
+package com.reliancy.util;
+
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+
+/** Chains multiple iterators to act as one.
+ * 
+ */
+public class JointIterator<T> implements Iterator<T> {
+    final Iterator<T> iterators[];
+    int cursor;
+    @SafeVarargs
+    public JointIterator(Iterator<T> ...its){
+        this.iterators=its;
+        cursor=0;
+    }
+    @Override
+    public boolean hasNext() {
+        while(cursor<iterators.length){
+            if(iterators[cursor].hasNext()) return true;
+            cursor+=1; // cursor exhausted got to next iterator
+        }
+        return false;
+    }
+
+    @Override
+    public T next() {
+        if(cursor<iterators.length){
+            return iterators[cursor].next();
+        }else{
+            throw new NoSuchElementException();
+        }
+    }
+    
+}