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Compact Hashcode Method

·

class Foo {
    private String string;
    private Date date;
    private i;
    
    [...]

    public int hashCode() {
        int result;
        result = (string != null ? string.hashCode() : 0);
        result = 29 * result + (date != null ? date.hashCode() : 0);
        result = 31 * result + (i != null ? i : 0);
        [...]
        return result;
    }


Consider using larger prime numbers  if the number of properties is large.
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