【单选题】父类Person有子类Chinese和American,且两个子类都重写了父类中的walk()方法;下列哪项实现了多态编程 A. Chinese c=new Chinese("张三"); American a=new American("John"); B. Chinese c=new Chinese( "张三"); American a=new American("John"); c.walk(); a.walk(); C. Person person1=new Chinese("张三" ); Person person2=new American("John"); D. Person person1=new Chinese("张三" ); Person person2=new American("John"); person1.walk(); person2.walk();

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2021-07-15

【单选题】父类Person有子类Chinese和American,且两个子类都重写了父类中的walk()方法;下列哪项实现了多态编程 A. Chinese c=new Chinese("张三"); American a=new American("John"); B. Chinese c=new Chinese( "张三"); American a=new American("John"); c.walk(); a.walk(); C. Person person1=new Chinese("张三" ); Person person2=new American("John"); D. Person person1=new Chinese("张三" ); Person person2=new American("John"); person1.walk(); person2.walk();

【单选题】父类Person有子类Chinese和American,且两个子类都重写了父类中的walk()方法;下列哪项实现了多态编程
A. Chinese c=new Chinese("张三"); American a=new American("John"); B. Chinese c=new Chinese( "张三"); American a=new American("John"); c.walk(); a.walk(); C. Person person1=new Chinese("张三" ); Person person2=new American("John"); D. Person person1=new Chinese("张三" ); Person person2=new American("John"); person1.walk(); person2.walk();

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