Java vs. C#

Operator Overloading

Java
 
Java doesn't have operator overloading.
You have to work around.
public class Score implements Comparable
{
    int value;

    public Score (int score) {
        value = score;
    }
    public int compareTo (Object o) {
        return value - ((Score)o).value;
    }
    public boolean equals(Object o) {
        return value==((Score)o).value;
    }
    public static void main(String[] args) {
        Score a = new Score(5);
        Score b = new Score(5);
        Object c = a;
        System.out.println(a.compareTo(b));//0
        System.out.println(a==b);          //false
        System.out.println(a==c);          //true
        System.out.println(a.equals(b));   //true
        System.out.println(a>c);           //illegal
    }
}

C#
 
public class Score : IComparable
{
    int value;

    public Score (int score) {
        value = score;
    }

    public static bool operator == (Score x, Score y) {
        return x.value == y.value;
    }

    public static bool operator != (Score x, Score y) {
        return x.value != y.value;
    }

    public int CompareTo (object o) {
        return value - ((Score)o).value;
    }
}
Score a = new Score (5);
Score b = new Score (5);
Object c = a;
System.Console.WriteLine (((IComparable)c).CompareTo (a)); //0
System.Console.WriteLine ((object)a == (object)b;     // false
System.Console.WriteLine (a == b);                    // true
(!= and ==, > and <, >= and <=), must both be defined.