Hashmap usage

Question

Dear JAVA Community,
Could you please help me, I'am old C++-Programmer und i am trying to understand JAVA. Thank you very much.
That works pretty:
HashMap myMap = new HashMap();
for (int i = 0; i < someGivenNumber; i++) {
     myClass r = new myClass (x*i,y*i); 
     myMap.put("r" + i, r);
}Now, I would like to acces a method of the instance r2 e.g:
r2.print();Unfortunately, I have not been able to discover this in the documentation. (Maybe because I am mentally handicapped by older experiences :-)
thank you very much for your kind descriptions
Emil from Vienna

Answer 1

alternatiively, although I prefer the approcah above
import java.util.HashMap;
public class TestMethod {
    public static void main(String[] args) {
        HashMap myMap = new HashMap();
        for (int i = 0; i < 10; i++) {
            myMap.put("r" + i, new MyClass(5 * i, 5 * i));
        ((MyClass)myMap.get("r2")).print();
class MyClass{
    int i =0;
    int j =0;
    public MyClass(int i, int j){
        this.i = i;
        this.j = j;
    public void print(){
        System.out.println("i is "+i+" j is "+j);
}