patternjavaCritical

Iterate through a HashMap

Submitted by: @import:stackoverflow-api·Mar 10, 2026·

Viewed 0 times

iteratethroughhashmap

Problem

What's the best way to iterate over the items in a HashMap?

Solution

Iterate through the entrySet() like so:

public static void printMap(Map mp) {
    Iterator it = mp.entrySet().iterator();
    while (it.hasNext()) {
        Map.Entry pair = (Map.Entry)it.next();
        System.out.println(pair.getKey() + " = " + pair.getValue());
        it.remove(); // avoids a ConcurrentModificationException
    }
}

Code Snippets

public static void printMap(Map mp) {
    Iterator it = mp.entrySet().iterator();
    while (it.hasNext()) {
        Map.Entry pair = (Map.Entry)it.next();
        System.out.println(pair.getKey() + " = " + pair.getValue());
        it.remove(); // avoids a ConcurrentModificationException
    }
}

Context

Stack Overflow Q#1066589, score: 3458

Revisions (0)

No revisions yet.