How to create a static Map of String -> Array

Question

I need to create a static Map which maps a given String to an array of int\'s.

In other words, I\'d like to define something l

Answer 1

For the sake of completeness as this is the first result in google for 'java static define map' In Java 8 you can now do this.

Collections.unmodifiableMap(Stream.of(
            new SimpleEntry<>("a", new int[]{1,2,3}),
            new SimpleEntry<>("b", new int[]{1,2,3}),
            new SimpleEntry<>("c", new int[]{1,2,3}))
            .collect(Collectors.toMap((e) -> e.getKey(), (e) -> e.getValue())));

This nice part with this is that we aren't creating anonymous classes anymore with the double brace syntax ({{ }})

We can then extend this with some code to clean up the pattern like this guy did here http://minborgsjavapot.blogspot.ca/2014/12/java-8-initializing-maps-in-smartest-way.html

public static  Map.Entry entry(K key, V value) {
    return new AbstractMap.SimpleEntry<>(key, value);
}

public static  Collector, ?, Map> entriesToMap() {
    return Collectors.toMap((e) -> e.getKey(), (e) -> e.getValue());
}

public static  Collector, ?, ConcurrentMap> entriesToConcurrentMap() {
    return Collectors.toConcurrentMap((e) -> e.getKey(), (e) -> e.getValue());
}

final result

Collections.unmodifiableMap(Stream.of(
            entry("a", new int[]{1,2,3}),
            entry("b", new int[]{1,2,3}),
            entry("c", new int[]{1,2,3}))
            .collect(entriesToMap()));

which would give us a Concurrent Unmodifiable Map.