java小练习

面向对象编程练习1

练习2

题目：编写老师类 Homework03.java
(1)要求有属性“姓名name”， “年龄age” “职称post”， “基本工资salary
(2)编写业务方法，introduce()，实现输出一个教师的信息。
(3)编写教师类的三个子类:教授类、副教授类、讲师类。工资级别分别为:教授为1.3、副教授为1.2、讲师类1.1。在三个子类里面都重写父类的introduce()方法。(4)定义井初始化一个老师对象，调用业务方法，实现对象基本信息的后台打印。

分析： 1.老师类 属性 姓名name，年龄age，职称post，基本工资salary，级别grade

demo
老师类

class teacher{
//定义属性
    private String name;
    private String post;
    private int age;
    private double salary;
    private double grade;
    
    //打印信息方法
    public void introduce() {
        System.out.println("name="+ name +" age="+age+" post="+post+" salary="+salary+" grade="+grade);
    }
}
 //构造方法
    public teacher(String name, String post, int age, double salary ,double grade) {
        this.name = name;
        this.post = post;
        this.age = age;
        this.salary = salary;
        this.grade = grade;
    }

    public String getName() {
        return name;
    }

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

    public String getPost() {
        return post;
    }

    public void setPost(String post) {
        this.post = post;
    }

    public int getAge() {
        return age;
    }

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

    public double getSalary() {
        return salary;
    }

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

    public double getGrade() {
        return grade;
    }

    public void setGrade(double grade) {
        this.grade = grade;
    }

教授类

class Parofessor extends teacher{
    public Parofessor(String name, String post, int age, double salary, double grade) {
        super(name, post, age, salary, grade);
    }
    public void  introduce(){
    //复用代码
        System.out.println("这是教授的信息");
    super.introduce();
    }
}

总结：体现了面向对象编程的好处，通过复用代码减少代码行数

题目： 通过继承实现员工工资核算打印功能
父类：员工类
子类：部门经理类，普通员工类
(1)部门经理工资=1000+单日工资 * 天数*等级(1.2)。
(2)普通员工工资=单日工资 * 天数 * 等级(1.0)；
(3)员工属性：姓名，单日工资，工作天数；
(4)员工方法(打印工资)；
(5)普通员工及部门经理的都是员工子类。需要重写打印工资方法。
(6)定义并初始化普通员工对象，调用打印工资方法输入工资，定义并初始化部门经理对象，调用打印工资方法输入工资

demo
员工类：

public class staff{
       private String name;
       private double daySal;
       private int workDays;
       private double grade;

       //构造器，get，set

        public staff(String name, double daySal, int workDays, double grade) {
                this.name = name;
                this.daySal = daySal;
                this.workDays = workDays;
                this.grade = grade;
        }

        public String getName() {
                return name;
        }

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

        public double getDaySal() {
                return daySal;
        }

        public void setDaySal(double daySal) {
                this.daySal = daySal;
        }

        public int getWorkDays() {
                return workDays;
        }

        public void setWorkDays(int workDays) {
                this.workDays = workDays;
        }

        public double getGrade() {
                return grade;
        }

        public void setGrade(double grade) {
                this.grade = grade;
        }
        //方法 打印工资  viod printSal(){}
        public void printSal(){
                System.out.println(name+"工资="+daySal+workDays+grade);
        }
}

普通员工类

public class work extends staff {
    public work(String name, double daySal, int workDays, double grade) {
        super(name, daySal, workDays, grade);
    }

    @Override
    public void printSal() {
        super.printSal();
    }
}

经理类

public class manager extends staff{
    private double bonus;
    //因为奖金是不确定的，不用构造函数，使用set方法（这样我们可以更灵活的更改）
    public manager(String name, double daySal, int workDays, double grade) {
        super(name, daySal, workDays, grade);
    }

    public double getBonus() {
        return bonus;
    }

    public void setBonus(double bonus) {
        this.bonus = bonus;
    }

    //重写打印工资方法

    @Override
    public void printSal() {
        System.out.println("经理："+getName()+"t工资="
                +(bonus+getDaySal()*getWorkDays()*getGrade()));
    }
}