Java编程中抽象类测试文件详解：AbstractClassTest.java分析

import java.util.*;//Date、GregorianCalender
public class AbstractClassTest {public static void main(String[] args) {// TODO Auto-generated method stubPerson[] people&＃61;new Person[2];people[0]&＃61;new Employee("张浩",50000,1989,10,1);people[1]&＃61;new Student("李明","计算机科学");for(Person p:people)System.out.println(p.getName()&＃43;","&＃43;p.getDescription);}
}


public abstract class Person {//抽象类声明public Person(String n) {name&＃61;n;}public abstract String getDescription();//没有方法体的抽象方法public String getName() {return name;}private String name;
}


class Employee extends Person {//继承抽象类的子类public Employee(String n,double s,int year,int month,int day) {super(n);salary&＃61;s;GregorianCalender calender&＃61;new GregorianCalender(year,month-1,day);hireDay&＃61;calender.getTime();}public String getDescription() {//实现抽象方法return String.format("公司雇员&＃xff0c;年薪是¥%.2f。", salary);}private double salary;private Date hireDay;
}


class Student extends Person {//继承抽象类的子类public Student(String n,String m) {super(n);major&＃61;m;}public String getDescription() {//实现抽象方法return "大学生&＃xff0c;专业是"&＃43;major&＃43;"。";}private String major;
}


张浩&＃xff0c;公司雇员&＃xff0c;年薪是¥50000.00。
李明&＃xff0c;大学生&＃xff0c;专业是计算机科学。