Java——is-a、is-like-a、has-a
3.8 is-a、is-like-a、has-a
3.8.1 is-a(类和类之间的继承关系,泛化关系)
public class Animal{ public void method1() ; } public class Dog extends Animal { //Dog is a Animal } |
3.8.2 is-like-a(类对接口的实现,类和接口之间的关系,实现关系)
public interface I { public void method1() ; } public class A implements I { //A is like a I; public void method1() { //实现 } } |
3.8.3 has-a(A中包含B,关联关系)
public class A { //A has a B; private B b; } public class B { } |