Fail-fast vs Fail-safe Iterators

Javajava

The Question

What is the difference between fail-fast and fail-safe iterators?

What a Strong Answer Covers

• fail-fast = ConcurrentModificationException on modification
• operates on original
• modCount
• ArrayList/HashMap
• fail-safe = no exception works on copy
• CopyOnWriteArrayList/ConcurrentHashMap
• more memory overhead

Related Questions

• JVM vs JRE vs JDK
• Java Platform Independence
• How JVM Works
• Main Features of Java
• public static void main