adding multiple entries to a HashMap at once in one statement

Question

I need to initialize a constant HashMap and would like to do it in one line statement. Avoiding sth like this:

  hashMap.put(\"One\", new Integer(1)); // add         


        

Answer 1

Here's a simple class that will accomplish what you want

import java.util.HashMap;

public class QuickHash extends HashMap {
    public QuickHash(String...KeyValuePairs) {
        super(KeyValuePairs.length/2);
        for(int i=0;i

And then to use it

Map Foo=QuickHash(
    "a", "1",
    "b", "2"
);

This yields {a:1, b:2}