面向对象--抽象类的应用--模板设计

在Person类中定义了一个模板，在主方法中调用时，调用的就是普通方法，而子类只需要实现父类中的抽象方法，就可以得到一个具体信息。

abstract class Person
{
    public String name;
    public int age;
    public Person(String name,int age){
        this.name = name;
        this.age = age;
    }
    public void say(){
        System.out.println(this.getContent());
    }
    public abstract String getContent();
}
class Student extends Person
{
    public float score;
    public Student(String name,int age,float score){
        super(name,age);
        this.score = score;
    }
    public String getContent(){
        return "学生信息： 姓名："+this.name+" 年龄："+
            this.age+" 分数："+this.score;
    }
}
class Worker extends Person
{
    public float salary;
    public Worker(String name,int age,float salary){
        super(name,age);
        this.salary = salary;
    }
    public String getContent(){
        return "工人信息： 姓名："+this.name+" 年龄："+
            this.age+" 薪水："+this.salary;
    }
}
public class Demo4
{
    public static void main(String args[]){
        Person p1 = null;
        Person p2 = null;
        p1 = new Student("张帆",20,99f);
        p2 = new Worker("张正",32,4000f);
        p1.say();
        p2.say();
    }
}