What is the hashCode for a custom class having just two int properties?
===

In Java, I have a class that represents a point with int coordinates

    public class Point {
    	int x = -1;
    	int y = -1;
    
    	public Point (int xNew, int yNew) {
    		x = xNew; y = yNew;
    	}
    
    	public boolean equals (Object o) {
    		// no need for (o instanceof Point) by design
    		return x == ((Point)o).x && y == ((Point)o).y;
    	}
    }

I'm using objects of class `Point` as keys in a `HashMap` and as elements in a `HashSet`. 

What would be the best candidate for the `hashCode` function? I would make it double so that the left part is x and the right part is y, for example:
`x = 4, y = 12`, then the `hashCode` returns `4.12`. But by the implementation, it cannot be double, only int.

This is not an option:

    public int hashCode() {
        // no need to check for exception parseInt since x and y are valid by design
        return Integer.parseInt(Integer.toString(x) + Integer.toString(y));
    }
    
because values `x` and `y` can be too long, so that together they will not be converted.