java多态巩固

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多态巩固代码阅读题

目录

多态巩固代码阅读题

（1）阅读如下代码，分析运行结果

（2）阅读如下代码，分析运行结果

（3）阅读如下代码，分析运行结果

（4）阅读如下代码，分析运行结果

（5）阅读如下代码，分析运行结果

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（1）阅读如下代码，分析运行结果

public class Test01 {public static void main(String[] args) {A a = new B();System.out.println(a.num);System.out.println(((B)a).num);System.out.println(((A)((B)a)).num);System.out.println("-------------------");B b = new B();System.out.println(b.num);System.out.println(((A)b).num);System.out.println(((B)((A)b)).num);}
}
class A{int num = 1;
}
class B extends A{int num = 2;
}

（2）阅读如下代码，分析运行结果

public class Test2 {public static void main(String[] args) {Father f = new Father();Father s = new Son();Father d = new Daughter();
​MyClass my = new MyClass();my.method(f);my.method(s);my.method(d);}
}
class MyClass{public void method(Father f) {System.out.println("father");}public void method(Son s) {System.out.println("son");}public void method(Daughter f) {System.out.println("daughter");}
}
class Father{}
class Son extends Father{}
class Daughter extends Father{}

（3）阅读如下代码，分析运行结果

public class Test3 {public static void main(String[] args) {MyClass my = new MyClass();Father f = new Father();Son s = new Son();Daughter d = new Daughter();my.method(f);my.method(s);my.method(d);}
}
class MyClass{public void method(Father f) {System.out.println("father");}public void method(Son s) {System.out.println("son");}
}
class Father{}
class Son extends Father{}
class Daughter extends Father{}

（4）阅读如下代码，分析运行结果

public class Test4 {public static void main(String[] args) {MyClass my = new MySub();Father f = new Father();Son s = new Son();Daughter d = new Daughter();my.method(f);my.method(s);my.method(d);}
}
class MyClass{public void method(Father f) {System.out.println("father");}public void method(Son s) {System.out.println("son");}
}
class MySub extends MyClass{public void method(Daughter d) {System.out.println("daughter");}
}
class Father{}
class Son extends Father{}
class Daughter extends Father{}

（5）阅读如下代码，分析运行结果

public class Test5 {public static void main(String[] args) {MyClass my = new MySub();Father f = new Father();Son s = new Son();Daughter d = new Daughter();my.method(f);my.method(s);my.method(d);}
}
class MyClass{public void method(Father f) {System.out.println("father");}public void method(Son s) {System.out.println("son");}
}
class MySub extends MyClass{public void method(Father d) {System.out.println("daughter");}
}
class Father{
​
}
class Son extends Father{
​
}
class Daughter extends Father{}

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