2021-10-06

韩顺平第八章多态的题②

package polyparemeter;

public class Employ {
    private String name;
    private double salary;

    public Employ(String name, double salary) {
        this.name = name;
        this.salary = salary;
    }

    public String getName() {
        return name;
    }

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

    public double getSalary() {
        return salary;
    }

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

    public double getAnnual(){
        return 12*salary;
    }
}

父类

package polyparemeter;

public class Manager extends Employ{
    private double bonus;

    public Manager(String name, double salary, double bonus) {
        super(name, salary);
        this.bonus = bonus;
    }

    public double getBonus() {
        return bonus;
    }

    public void setBonus(double bonus) {
        this.bonus = bonus;
    }
    public String manage(){
        return "经理" + getName() + "薪资" + getSalary() + "正在管理";
    }
    public double getAnnual(){
        return 12*(super.getSalary() + bonus);
    }
}

子类

package polyparemeter;

public class Worker extends Employ{
    public Worker(String name, double salary) {
        super(name, salary);
    }
    public String work(){
        return "员工" + getName() + "薪资" + getSalary() + "正在工作";
    }
    public double getAnnual(){
        return 12*(super.getSalary());
    }
}

子类

package polyparemeter;

class Test {
   public void testWork(Employ e) {

       if (e instanceof Worker){
           System.out.println(((Worker)e).work());
       }else if(e instanceof Manager){
           System.out.println(((Manager) e).manage());
       }else{
           System.out.println("输入错误");
       }
   }
    public void showEmpAnnual(Employ e){
        System.out.println(  e.getAnnual());
    }

    public static void main(String[] args) {

//         第二种方法，多态参数
       Manager manager = new Manager("ZJH",2,8);
        Worker worker = new Worker("LGD",1);
        Test test = new Test();
        test.showEmpAnnual(manager);
        test.showEmpAnnual(worker);
        test.testWork(manager);
        test.testWork(worker);
    }
}

主方法，第一种

package polyparemeter;

public class Test2 {
    public void testWork(Employ e) {

        if (e instanceof Worker){
            System.out.println(((Worker)e).work());
        }else if(e instanceof Manager){
            System.out.println(((Manager)e).manage());
        }else{
            System.out.println("输入错误");
        }
    }
    public void showEmpAnnual(Employ e) {
        System.out.println(e.getAnnual());
    }

    public static void main(String[] args) {
        // 第一种方法，向上转型
        Employ employ = new Manager("ZJH", 2, 8);
        Employ employ1 = new Worker("LG", 1);
        Test2 test = new Test2();
        test.showEmpAnnual(employ);
        test.showEmpAnnual(employ1);
        test.testWork(employ);
        test.testWork(employ1);
    }
}

子方法第二种