Example of using a parameter on a constructor.

TwoOfAType.java

/**
Example of using a parameter on a constructor.  Parameters on methods are used to 
describe either type relationships  between arguments to the method or between the 
argument and the return type (more common but not possible in a constructor).  Here 
I use the type X to specify that the two args are of the same type.  

When calling it, specifying the type is optional as it will automatically be 
inferred. In cases where the incorrect type is inferred (wrong place in shared 
hierarchy), you can specify it.  If there is no common type, you'll get an error 
at compile time.
*/

public class TwoOfAType {
	private Object[] stuff = new Object[2];
	
	public <X> TwoOfAType(X a1, X a2) {
		stuff = new Object[] { a1, a2 };
	}

	public String toString() {
		return stuff[0] + " " + stuff[1];
	}
	
	public static void main(String arg[]) {
		TwoOfAType t = new <String> TwoOfAType("a", "b");
		System.out.println(t);public class TwoOfAType {
	private Object[] stuff = new Object[2];
	
	public <X> TwoOfAType(X a1, X a2) {
		stuff = new Object[] { a1, a2 };
	}

	public String toString() {
		return stuff[0] + " " + stuff[1];
	}
	
	public static void main(String arg[]) {
		TwoOfAType t = new <Number> TwoOfAType(Integer.valueOf(1), Double.valueOf(2.0));
		System.out.println(t);
	}
}