How can I initialise a static Map?

Question

How would you initialise a static Map in Java?

Method one: static initialiser
Method two: instance initialiser (anonymous subclass) or some other m

Answer 1

Here's my favorite when I don't want to (or cannot) use Guava's ImmutableMap.of(), or if I need a mutable Map:

public static  Map asMap(Object... keysAndValues) {
    return new LinkedHashMap() {{
        for (int i = 0; i < keysAndValues.length - 1; i++) {
            put(keysAndValues[i].toString(), (A) keysAndValues[++i]);
        }
    }};
}

It's very compact, and it ignores stray values (i.e. a final key without a value).

Usage:

Map one = asMap("1stKey", "1stVal", "2ndKey", "2ndVal");
Map two = asMap("1stKey", Boolean.TRUE, "2ndKey", new Integer(2));