Typical Collections: ArrayList, HashSet, HashMap (all from java.util). 𝗛𝗼𝘄 𝗶𝘁 𝘄𝗼𝗿𝗸𝘀 𝗶𝗻𝘁𝗲𝗿𝗻𝗮𝗹𝗹𝘆 ? Collections like ArrayList maintain a modCount (modification count). Iterator saves ...