Added ItemMonsterEgg.java for diff visibility

src/main/java/net/minecraft/server/ItemMonsterEgg.java

@@ -0,0 +1,32 @@
+package net.minecraft.server;
+
+public class ItemMonsterEgg extends Item {
+
+    public ItemMonsterEgg(int i) {
+        super(i);
+        this.e(1);
+        this.a(true);
+    }
+
+    public boolean a(ItemStack itemstack, EntityHuman entityhuman, World world, int i, int j, int k, int l) {
+        if (world.isStatic) {
+            return true;
+        } else {
+            i += Facing.b[l];
+            j += Facing.c[l];
+            k += Facing.d[l];
+            Entity entity = EntityTypes.a(itemstack.getData(), world);
+
+            if (entity != null) {
+                if (!entityhuman.abilities.canInstantlyBuild) {
+                    --itemstack.count;
+                }
+
+                entity.setPositionRotation((double) i + 0.5D, (double) j, (double) k + 0.5D, 0.0F, 0.0F);
+                world.addEntity(entity);
+            }
+
+            return true;
+        }
+    }
+}