请问关于多态的有关问题
日期：2014-05-20 浏览次数：20825 次
请教关于多态的问题
为什么这里输出的是 person 而不是 student呢?
------解决方案--------------------
- Java code
public class Person {
String name="person";
public void shout(){
System.out.println(name);
}
}
public class Student extends Person{
String name="student";
String school="school";
}
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Person p=new Student();
p.shout();
}
}
为什么这里输出的是 person 而不是 student呢?
------解决方案--------------------
- Java code
public class Student extends Person {
Student(){
this.name = "student";
String school = "school";
}
}
------解决方案--------------------
试试
- Java code
public class Person {
String name="person";
public void shout(){
System.out.println(getName());//相当于this.getName()，属性相当于this.name 方法重写 属性隐藏 this类似于 Person this = new Student() this是Person类型引用
}
public String getName()
{
return name;
}
}
public class Student extends Person{
String name="student";
String school="school";
}
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Person p=new Student();
p.shout();
}
}
------解决方案--------------------
- Java code
interface Say {
public abstract void shout();
}
class Person {
String name = "Person";
}
class Student extends Person implements Say {
String name = "Student";
@Override
public void shout() {
// TODO Auto-generated method stub
System.out.println(name);
}
}
class Teacher extends Person implements Say {
String name = "Teacher";
@Override
public void shout() {
// TODO Auto-generated method stub
System.out.println(name);
}
}
public class Main {
public static void main(String[] args) {
// TODO Auto-generated method stub
Say personSay;
personSay = new Student();
personSay.shout();
personSay = new Teacher();
personSay.shout();
}
}
// result:
/*
Student
Teacher
*/
免责声明： 本文仅代表作者个人观点，与爱易网无关。其原创性以及文中陈述文字和内容未经本站证实，对本文以及其中全部或者部分内容、文字的真实性、完整性、及时性本站不作任何保证或承诺，请读者仅作参考，并请自行核实相关内容。
