Java进阶-is-a、is-like-a、has-a

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字数统计: 78 字 | 阅读时长 ≈ 1 分钟

is-a：泛化

is-like-a：实现

has-a：关联

is-a

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public class Animal{ 
    public void method1(); 
}
public classDog extends Animal { 
    // Dog is a Animal
}

is-like-a

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public interface I{ 
    public void method1(); 
} 
public classA implements I{ // A is like a I; 
    public void method1(){ 
        // 实现 
    } 
}

has-a

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public class A { // A has a B; 
    private B b;
}
public class B{
}