Java developers

I am reading a Java book now which has the following HashMap declaration:
HashMap<String, Integer> scores = new HashMap<String, Integer> ();

The book says that this means the keys are strings and values are integers. Fair enough. So, I'm curious about two things:
1) In real-life, wouldn't it be more common to have the Integer be a key instead of a String? I know this isn't a Java-specific question, but developers here have so much more real-life development experience than me, maybe you can share.

2) Also, I'm wondering, is there ever a situation that would arise where the two types wouldn't match, like, would you ever have something in practice like:
HashMap<Object,Object> scores = new HashMap<String, Integer> ();

Just curious.

Hi,

This is not a Java question, strictly speaking, but at least it's Java-related.

I know that properties etc. can be used, but I'm interested in the command line in this case.

In a Windows cmd script, one can write

java %1 %2 %3 %4 %5 %6 %7 %8 %9

This will pass arguments 1 through 9 that were supplied on the command line when executing the script.

Is there a way to pass the 10th argument?

Thanks in advance.

String [] flintstones = {"Fred","Wilma","Pebbles"};
System.out.println(flintstones); // prints only []; expected is [Fred, Wilma, Pebbles]

I know that I can use a loop to print each of these items individual, but I don't understand why the JVM doesn't know the meaning of something as simple as System.out.println(someArray).

So, basically what I'm asking is a question about language design: why was it done this way?