类与类之间的关系及在代码中的表现

1.继承:

 

 Animal
        {
        }
        public class Bird:Animal
        {
        }

2.关联关系

 

        public class Climate
        {
        }
        public class Penguin : Bird
        {
            private Climate climate;//在企鹅Penguin中,引用到气候Climate对象
        }
        #endregion

3.聚合关系

 

        //大雁
        public class WideGoose
        {
        }
        public class WideGooseAggregate
        {
            private WideGoose[] arrayWideGoose;//在雁群WideGooseAggregate类中,有大雁数组对象arrayWideGoose
        }
        #endregion

4.组合关系

 

        public class Duck:Bird
        {
            private Wing wing;
            public Duck()
            {
                //在Duck类中,初始化时,实例化翅膀Wing,他们之间同时生成
                wing = new Wing();
            }
        }
        public class Wing
        {
        }
        #endregion

5.依赖关系

 

        public class Water
        {
        }
        public class People
        {
            //人依赖于水
            public People(Water water)
            {
            }
        }
        #endregion