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using System;
 
// Базовый класс Object.
 
// Правило: Переопределяйте GetHashCode переопределяя Equals.
 
namespace ClassObject
{
    class Point : object
    {
        protected int x, y;
 
        public Point(int xValue, int yValue)
        {
            x = xValue;
            y = yValue;
        }
 
        public override bool Equals(Object obj)
        {
            if (obj == null || GetType() != obj.GetType())
                return false;
 
            Point p = (Point)obj;
            return (x == p.x) && (y == p.y);
        }
 
        public override int GetHashCode()
        {
            return x ^ y;
        }
    }
 
    class Program
    {
        static void Main()
        {
            Point a = new Point(1, 2);
            Point b = new Point(1, 2);
            Point c = new Point(0, 0);
 
            Console.WriteLine("a == b : {0}", a.Equals(b));
            Console.WriteLine("a == c : {0}", a.Equals(c));
 
            Console.WriteLine("a == b : {0}", Equals(a, b));
            Console.WriteLine("a == c : {0}", Equals(a, c));
 
            // Delay.
            Console.ReadKey();
        }
    }
}

Main.java:1: error: class, interface, or enum expected
using System;
^
Main.java:7: error: class, interface, or enum expected
namespace ClassObject
^
Main.java:9: error: '{' expected
    class Point : object
               ^
Main.java:19: error: ';' expected
        public override bool Equals(Object obj)
                            ^
Main.java:19: error: invalid method declaration; return type required
        public override bool Equals(Object obj)
                             ^
Main.java:28: error: <identifier> expected
        public override int GetHashCode()
                       ^
Main.java:28: error: invalid method declaration; return type required
        public override int GetHashCode()
                            ^
Main.java:52: error: class, interface, or enum expected
}
^
8 errors

Standard output is empty