ArrayList、HashMap 与 员工类（程序员、经理的结合使用） 相当于集合与继承的总结

package Day28ketangzuoye;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

public class EmployeeTest {

    public static void main(String[] args) {
        Emp se1=new SE(0001,"蔡正",true,6000,80);
        Emp se2=new SE(0002,"丁陆",true,7000,89);
        
        Emp pm1=new PM(1001,"王拥江",true,9000,"一年",3000);
        Emp pm2=new PM(1002,"贝杰明",true,13000,"七年",5000);
        
        System.out.println("ArrayList");
        ArrayList<Emp> list=new ArrayList<Emp>();
        list.add(se1);
        list.add(se2);
        list.add(pm1);
        list.add(pm2);
        SE e;
        PM m;
        for(Emp p:list){
            if(p instanceof SE){
                e=(SE)p;
                e.show();
            }else if(p instanceof PM){
                m=(PM)p;
                m.show();
            }else{
                System.out.println("出错！");
            }
        }
        
        System.out.println("

 HashMap");
        Map<String,Emp> map=new HashMap<String,Emp>();
        map.put("蔡正",se1);
        map.put("丁陆",se2);
        map.put("王拥江",pm1);
        map.put("贝杰明",pm2);
        String[] str={"蔡正","丁陆","王拥江","贝杰明"};
        Emp p;
        for(int i=0;i<map.size();i++){
             p=map.get(str[i]);
            if(p instanceof SE){
                e=(SE)p;
                e.show();
            }else if(p instanceof PM){
                m=(PM)p;
                m.show();
            }else{
                System.out.println("出错！");
            }
        }
        
    }
}

class Emp {
    public  int id;
    public  String name;
    public  boolean gender;
    public  double salary;

    
    public Emp() {
        super();
    }

    public Emp(int id, String name, boolean gender, double salary) {
        super();
        this.id = id;
        this.name = name;
        this.gender = gender;
        this.salary = salary;
    }

    public void show(){};
}

class SE extends Emp {
    int hot;

    public SE(int id, String name, boolean gender, double salary,int hot) {
        super(id,name,gender,salary);
        this.hot = hot;
    }

    @Override
    public void show() {
        System.out.println("SE [id=" + id + ", name=" + name + ", gender="
                + gender + ", salary=" + salary + ", hot=" + hot + "]");
    }
}

class PM extends Emp{
    String exp;
    double bonus;
    
    
    public PM(int id, String name, boolean gender, double salary,String exp, double bonus) {
        super(id,name,gender,salary);
        this.exp = exp;
        this.bonus = bonus;
    }


    @Override
    public void show() {
        System.out.println("PM [id=" + id + ", name=" + name + ", gender="
                + gender + ", salary=" + salary + ", exp=" + exp + ", bonus=" + bonus + "]");
    }
}

ArrayList
SE [id=1, name=蔡正, gender=true, salary=6000.0, hot=80]
SE [id=2, name=丁陆, gender=true, salary=7000.0, hot=89]
PM [id=1001, name=王拥江, gender=true, salary=9000.0, exp=一年, bonus=3000.0]
PM [id=1002, name=贝杰明, gender=true, salary=13000.0, exp=七年, bonus=5000.0]


 HashMap
SE [id=1, name=蔡正, gender=true, salary=6000.0, hot=80]
SE [id=2, name=丁陆, gender=true, salary=7000.0, hot=89]
PM [id=1001, name=王拥江, gender=true, salary=9000.0, exp=一年, bonus=3000.0]
PM [id=1002, name=贝杰明, gender=true, salary=13000.0, exp=七年, bonus=5000.0]