What class allows me to manipulate the index and value?

Question

In PHP, I can change the index and value of arrays.

$array = array("foo" => 54);

So then

$array["foo"] 

returns 54. How can I do this in Java?

Answer 1

The equivalent of PHP's associative array is a Map in Java. Both share the key-value pair implementation with the most commonly used implementation being HashMap

Map<String, Integer> map = new HashMap<>();
map.put("foo", 54);

System.out.println(map.get("foo")); // displays 54

Other implementations exist such as LinkedHashMap which preserves insertion order and TreeMap which is sorted according to the natural ordering of its keys.

Answer 2

Use a map implementation to do exactly this:

Map<String, Integer> m = new HashMap<String, Integer>();
m.put("foo", 54);
m.get("foo"); // will yield 54