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public class Animal{ public void method1() ; } public class Dog extends Animal { //Dog is a Animal } |
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public interface I { public void method1() ; } public class A implements I { //A is like a I; public void method1() { //实现 } } |
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public class A { //A has a B; private B b; } public class B { } |
原文：https://www.cnblogs.com/superjishere/p/11839878.html