How many ways ways to traverse a Map ?

1. Using entrySet

1.1 Iterate using foreach

Set entries = map.entrySet();

for(Map.Entry entry : entries) {

   Object key = entry.getKey();

   Object value = entry.getValue();

   System.out.println(key + " = " + value);

}

1.2 Iterate using Iterator

Set entries = map.entrySet();

for(Iterator it = entries.iterator(); it.hasNext();) {

   Map.Entry entry = it.next();

   Object key = entry.getKey();

   Object value = entry.getValue();

   System.out.println(key + " = " + value);

}

2. Using keySet

2.1 Iterate using foreach

for(Object key : map.keySet()) {

   Object value = map.get(key);

   System.out.println(key + " = " + value);

}

2.2 Iterate using Iterator

Set keys = map.keySet();

for(Iterator it = keys.iterator(); it.hasNext();) {

   Object key = it.next();

   Object value = map.get(key);

   System.out.println(key + " = " + value);

}