【Java:继承中遇到的问题。】
package practice;class Person{
public Person() {}
}
class Student extends Person{
public Student() {}
}
public class Pra014 {
static void foo(Person p) {
System.out.println("I am a instance of "+p.getClass());
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Person p = new Person();
Student s = new Student();
foo(p);
foo(s);
}
}
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IDE提示warning的地方我用红色标出来了,但知道是哪里的问题。(之前觉得也许是static关键字和继承的问题。)
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