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Generics (Restrictions on Generics (Cannot create static fields whos types…

- - - - psvm{
        Box<int, Strng> box = new Box<>();
        } - int isn`t allowed
        This is correct
        Box<Integer, String> box = new Box<>();
  - - - consider following : MobileDevice<Smartphone> smatphone = new MobileDevice<>(); MobileDevice<Pager> pager = new MobileDevice<>(); OF WHICH TYPE IS OS? It can`t be both of type Smartphone and Pager
  - - - If arrays of parametrized type were allowed strings[0] = new ArrayList<Integer>();// an exception should be thrown, but runtime fails to detect it.
- - - - public static <T> void sink(T t){ }
      - public static <T> T identity(T t){return t;}
      - public static T noGood(T t ){return t}//does not compile
    - - public class Util{public static <K, V> boolean compare (Pair <K, V> p1, Pair <K, V> p2)}
        
        complete syntax for invoking method
        boolean same = Util.<Integer, String>compare(p1, p2)
        
        calling like normal method and compiler will figure out which type is needed
        boolean same = Util.compare(p1, p2);