How to populate static, predefined data in a Map/HashMap in Java

Java FAQ: How do I populate (initialize) a static HashMap in Java?

If you need to initialize/populate a Map/HashMap in Java, the following source code shows the proper syntax:

 * Off Tackle Run vs 3-4 Defense [Yardage Gained -> Probability]
public static final Map<Integer, Float> RunOffTackle_34Defense = new HashMap<Integer, Float>() {{
    put(-99, 1f);  //1 fumble per 100 hand-offs
    put(-1,  4f);
    put( 0,  5f);
    put( 1,  9f);
    put( 2,  11f);
    put( 3,  15f);
    put( 4,  15f);
    put( 5,  11f);
    put( 6,  9f);
    put( 7,  5f);
    put( 8,  4f);
    put( 9,  3f);
    put(10,  3f);
    put(12,  2f);
    put(15,  2f);
    put(20,  1f);

As you can see, this syntax lets me add static, predefined data to my Java Map/HashMap. I use this approach in a Java/Android football game that I’m currently writing. The important thing that this example shows is how to add data to a HashMap when you first create/define the HashMap (i.e., how to initialize it).