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There are three ways to cycle over a collection:

• Enumeration (old-style; read-only)
• Iterator
• View (Set interface)

These are examples of views that cycle over the keys and the values of a map:

	Map<String, String> map = new HashMap<String, String>();
		
	map.put("Name", "Mike");
	map.put("Surname", "Sullivan");
		
	for (String key : map.keySet())
		System.out.println("Key = " + key);
	
	for (String value : map.values())
		System.out.println("Value = " + value);

This is an example returning a set of Map.Entry (where a Map.Entry is a key-value pair):

	Map<String, String> map = new HashMap<String, String>();

	map.put("Name", "Mike");
	map.put("Surname", "Sullivan");
		
	Set<Map.Entry<String, String>> entries = map.entrySet();
		
	for (Map.Entry<String, String> entry : entries)
		System.out.println(entry.getKey() + " = " + entry.getValue());

A map can have three types of views:

• keySet (keys)
• values (values)
• entrySet (key-value pairs)