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+# 作业1
+
+## 多态练习
+
+### 1、图形
+
+（1）父类Graphic图形
+
+- public double area()方法：返回0.0
+- public double perimeter()方法：返回0.0
+- public String getInfo()方法，返回图形面积和图形周长
+
+（2）子类Circle圆继承Graphic图形
+
+- 包含属性：radius，属性私有化
+- 包含get/set方法
+- 重写area()求面积方法
+- 重写perimeter()求周长方法
+- 重写getInfo()方法，返回圆的半径，面积和周长
+
+（3）子类矩形Rectangle继承Graphic图形
+
+- 包含属性：length、width，属性私有化
+- 包含get/set方法
+- 重写area()求面积方法
+- 重写perimeter()求周长方法
+- 重写getInfo()方法，返回长和宽，面积、周长信息
+
+（4）在测试类中，新建一个比较图形面积的方法，再建一个比较图形周长的方法，main方法中创建多个圆和矩形对象,再调用方法比较他们的周长或面积。
+
+```java
+package 多态;
+
+public class Graphic {
+    public double area(){  //面积
+        return 0.0;
+    }
+    public double perimeter(){  //周长
+        return 0.0;
+    }
+    public String getlnfo(){
+        return area()+","+perimeter();
+    }
+}
+class Circle extends Graphic{ //子类圆
+    private double radius;
+
+    public double getRadius() {
+        return radius;
+    }
+
+    public void setRadius(double radius) {
+        this.radius = radius;
+    }
+
+    @Override
+    public double area() {
+        return Math.PI * radius * radius;
+    }
+
+    @Override
+    public double perimeter( ) {
+        return  2*Math.PI*radius;
+    }
+
+    @Override
+    public String getlnfo( ) {
+        return "半径："+radius+",面积："+area()+",周长："+perimeter();
+    }
+}
+class Rectangle extends Graphic{ //子类矩形
+    private double length;
+    private double width;
+
+    public double getLength() {
+        return length;
+    }
+
+    public void setLength(double length) {
+        this.length = length;
+    }
+
+    public double getWidth() {
+        return width;
+    }
+
+    public void setWidth(double width) {
+        this.width = width;
+    }
+
+    @Override
+    public double area() {
+        return length*width;
+    }
+
+    @Override
+    public double perimeter() {
+        return (length+width)*2;
+    }
+
+    @Override
+    public String getlnfo() {
+        return "长："+length+",宽"+width+",面积："+area()+",周长："+perimeter();
+    }
+}
+```
+
+测试类
+
+```java
+package 多态;
+
+public class GraphicDemo {
+    public static void main(String[] args) {
+        Circle c = new Circle();
+        c.setRadius(5);
+        System.out.println("圆的" + c.getlnfo());
+
+        System.out.println("-----------------");
+        Rectangle r = new Rectangle();
+        r.setLength(10);
+        r.setWidth(5);
+        System.out.println("矩形" + r.getlnfo());
+        System.out.println("-----------------");
+        GraphicDemo demo = new GraphicDemo();
+        demo.compare(c,r);  //调用方法，并赋予两个对象
+    }
+ 
+    public void compare(Circle c , Rectangle r ) {  //传入两个类
+		// 比周长
+        if (c.perimeter() > r.perimeter()) { 
+            System.out.println("圆的周长更长：" + c.perimeter());
+        } else if (c.perimeter() == r.perimeter()) {
+            System.out.println("一样长");
+        } else {
+            System.out.println("矩形的周长更长：" + r.perimeter());
+        }
+    }
+}
+
+```
+
+# 作业2
+
+### 2、员工
+
+（1）声明一个父类Employee员工类型，
+
+- 有姓名属性，私有化，提供get/set方法
+- public double earning()：代表实发工资，返回0.0
+- public String getInfo()：显示姓名和实发工资
+
+（2）声明MyDate类型
+
+- 有int类型的年，月，日属性，私有化，提供get/set方法
+- 提供public String getInfo()，返回“xxxx年xx月xx日”
+
+（3）声明一个子类SalaryEmployee正式工，继承父类Employee
+
+- 增加属性，double类型的薪资，MyDate类型的出生日期，私有化，提供get/set方法
+- 重写方法，public double earning()返回实发工资， 实发工资 = 薪资
+- 重写方法，public String getInfo()：显示姓名和实发工资、生日
+
+（4）声明一个子类HourEmployee小时工，继承父类Employee
+
+- 有属性，double类型的工作小时数和每小时多少钱
+- 重写方法，public double earning()返回实发工资， 实发工资 = 每小时多少钱 * 小时数
+- 重写方法，public String getInfo()：显示姓名和实发工资，时薪，工作小时数
+
+（5）声明一个子类Manager经理，继承SalaryEmployee
+
+- 增加属性：奖金比例，私有化，提供get/set方法
+- 重写方法，public double earning()返回实发工资， 实发工资 = 薪资 *(1+奖金比例)
+- 重写方法，public String getInfo()：显示姓名和实发工资，生日，奖金比例
+
+（6）声明一个员工数组，存储各种员工，你现在是人事，遍历查看每个人的详细信息，并统计实发工资总额，通知财务准备资金。
+
+（7）从键盘输入当期月份值，如果他是正式工（包括SalaryEmployee和Manager），并且是本月生日的，通知领取生日礼物。
+
+```java
+package 员工;
+
+public class Employee {  //员工类型
+    private String name;
+
+    public Employee() {
+    }
+
+    public Employee(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public double earning() {  //代表实发工资
+        return 0.0;
+    }
+
+    public String getInfo() {
+        return name + earning();
+    }
+}
+
+class MyDate {
+    private int year;
+    private int month;
+    private int date;
+
+    public MyDate(int year, int month, int date) {
+        this.year = year;
+        this.month = month;
+        this.date = date;
+    }
+
+    public MyDate() {
+    }
+
+    public int getYear() {
+        return year;
+    }
+
+    public void setYear(int year) {
+        this.year = year;
+    }
+
+    public int getMonth() {
+        return month;
+    }
+
+    public void setMonth(int month) {
+        this.month = month;
+    }
+
+    public int getDate() {
+        return date;
+    }
+
+    public void setDate(int date) {
+        this.date = date;
+    }
+
+    @Override
+    public String toString() {
+        return year + "年" + month + "月" + date + "日";
+    }
+}
+
+class SalaryEmployee extends Employee { //正式工
+    private double salary;
+    private MyDate day;
+
+    public SalaryEmployee(String name) {
+        super(name);
+    }
+
+    public SalaryEmployee(String name, double salary, MyDate day) {
+        super(name);
+        this.salary = salary;
+        this.day = day;
+    }
+
+    public double getSalary() {
+        return salary;
+    }
+
+    public void setSalary(double salary) {
+        this.salary = salary;
+    }
+
+    public MyDate getDay() {
+        return day;
+    }
+
+    public void setDay(MyDate day) {
+        this.day = day;
+    }
+
+    @Override
+    public double earning() {
+        return salary;
+    }
+
+    @Override
+    public String getInfo() {
+        return "姓名:" + getName() + ",实发工资：" + earning() + ",生日" + day;
+    }
+}
+
+class HourEmployee extends Employee {  //小时工
+    private double hours;
+    private double much;
+
+    public HourEmployee(String name) {
+        super(name);
+    }
+
+    public HourEmployee(String name, double hours, double much) {
+        super(name);
+        this.hours = hours;
+        this.much = much;
+    }
+
+    @Override
+    public double earning() {
+        return hours * much;
+    }
+
+    @Override
+    public String getInfo() {
+        return "姓名：" + getName() + ",实发工资：" + earning() + ",时薪：" + much + ",工作小时数：" + hours;
+    }
+}
+
+class Manager extends SalaryEmployee { //经理
+
+    private double ratio;
+
+    public Manager(String name) {
+        super(name);
+    }
+
+
+    public Manager(String name, double ratio) {
+        super(name);
+        this.ratio = ratio;
+    }
+
+    public Manager(String name, double salary, MyDate day, double ratio) {
+        super(name, salary, day);
+        this.ratio = ratio;
+    }
+
+    public double getRatio() {
+        return ratio;
+    }
+
+    public void setRatio(double ratio) {
+        this.ratio = ratio;
+    }
+
+    @Override
+    public double earning() {
+        return getSalary() * (1 + ratio);
+    }
+
+    @Override
+    public String getInfo() {
+        return "姓名：" + getName() + ",实发工资：" + earning() + ",生日：" + getDay() + ratio;
+    }
+}
+
+```
+
+
+
+测试类
+
+```java
+package 员工;
+
+import java.awt.*;
+import java.util.Scanner;
+
+public class EmployeeDemo {
+    public static void main(String[] args) {
+        MyDate date = new MyDate(1998, 2, 4);
+        Employee ho = new HourEmployee("林被", 8, 20);
+        Employee ma = new Manager("林总", 0.3);
+        Employee sa = new SalaryEmployee("老王", 22, date);
+        Employee[] arr = {ho, ma, sa};
+        for (int i = 0; i < arr.length; i++) {
+            System.out.println(arr[i].getInfo());
+        }
+
+        Scanner sc = new Scanner(System.in);
+        System.out.println("请输入当前月份");
+        int as = sc.nextInt();
+        for (int i = 0; i < arr.length; i++) {
+            if (arr[i] instanceof SalaryEmployee || arr[i] instanceof Manager) {
+                if (((SalaryEmployee) arr[i]).getDay().getMonth() == date.getMonth()) {
+                    System.out.println(arr[i].getName() + "请领取你的的生日礼物");
+                }
+            }
+        }
+    }
+}
+```
+