抽象类的应用-定义模板

最新推荐文章于 2021-12-02 18:31:55 发布

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问题定义：假设人分为学生和工人，学生和工人都可以说话，但是学生和工人说话的内容是不一样的，也就是说说话这个功能应该是一个具体功能，而说话的内容就要由学生或工人来决定了。可以使用抽象类来实现这个功能。abstract class Person{  //定义一个抽象类Person
    private String name; //name属性
    private int age;     //age属性

    public Person(String name, int age){ //构造方法
        this.setName(name);
        this.setAge(age);
    }

    public void setName(String name){
        this.name = name;
    }

    public String getName(){
        return this.name;
    }

    public void setAge(int age){
        this.age =age;
    }

    public int getAge(){
        return this.age;
    }

    public void say(){ //说话方法
        System.out.println(this.getContext());
    }

    public abstract String getContext();//返回人说话内容的方法，具体由子类来实现
};

class Student extends Person{ //学生类继承Person类，并且实现getContext方法
    private float score;
    public Student(String name,int age,float score){
        super(name,age);
        setScore(score);
    }

    public void setScore(float score){
        this.score = score;
    }

    public float getScore(){
        return this.score;
    }

    public String getContext(){ //实现getContext方法
        return "name = " + super.getName() + ", age = " + super.getAge() + ", score = " + this.getScore();
    }
};

class Worker extends Person{ //工人类实现Person类，并且实现getContext方法
    private float salary;
    public Worker(String name,int age,float salary){
        super(name,age);
        setSalary(salary);
    }

    public void setSalary(float salary){
        this.salary = salary;
    }

    public float getSalary(){
        return this.salary;
    }

    public String getContext(){
        return "name = " + super.getName() + ", age = " + super.getAge() + ", salary = " + this.getSalary();
    }
};

public class AbstractCaseDemo02{
    public static void main(String agrs[]){
        Person per1 = null;
        Person per2 = null;
        per1 = new Student("Tom",20,98.0f);//定义学生对象
        per2 = new Worker("Jay",34,5600.0f);//定义工人对象
        per1.say();
        per2.say();
    }
};
输出结果：
name = Tom, age = 20, score = 98.0
name = Jay, age = 34, salary = 5600.0