0926-----homework（4,5,6）

/**
  *homework0926
  *@author:kai li
  */
package com.kai.li.homework0926;
import java.util.List;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Random;
import java.util.Map;
import java.util.HashMap;
import static java.util.stream.Collectors.toMap;
/**
  *following class is client 
  */
public class HomeWork0926{
    public static void main(String[] args)throws Exception{
        
        /**
          *question four
          */
    
    List<String> strList=new ArrayList<String>();
    strList.add("hello");
    strList.add("world");
    strList.add("learn");
    Collections.reverse(strList);
    System.out.println(strList);  

    /**
        *question five
      */   
    
    /*create data source*/
    List<Account> accounts=Arrays.asList(new Account(10.00,"1234"),new Account(15.00,"5678"),new Account(0.00,"1010"));
    Map<Long,Account> accountMap=new HashMap<>();
    accountMap=accounts.stream().collect(toMap(i->i.getId(),i->i));
    System.out.println(accountMap);

    /**
      *question six
      */
    
    /*creat data source*/

    List<Worker> workerList=new ArrayList<>();
    workerList.add(new Worker("zhang3",18,3000));
    workerList.add(new Worker("li4",25,3500));
    workerList.add(new Worker("wang5",22,3200));

    /*operate*/
    
    workerList.add(1,new Worker("zhao6",24,3300));
    workerList.remove(3);
    
    //iterator
    workerList.stream().forEach(System.out::println);
    workerList.stream().forEach(Worker::work);
    }
}

/**
  *class for question five
  */
class Account{
    private long id;
    private double balance;
    private String password;
    Account(double balance,String password){
        Random random=new Random();
        this.id=random.nextInt(100000)+100000;
        this.balance=balance;
        this.password=password;
    }
    public long getId(){
        return id;
    }
    public double getBalance(){
        return balance;
    }
    public String getPassword(){
        return password;
    }
    @Override
    public String toString(){
        return "id："+id+",balance："+balance+"\n\r";
    }
}

/**
  *class for question six
  */
class Worker{
    private int age;
    private String name;
    private double salary;
    public Worker(){}
    public Worker(String name,int age,double salary){
        this.name=name;
        this.age=age;
        this.salary=salary;
    }
    public int getAge(){
        return age;
    }
    public String getName(){
        return name;
    }
    public double getSalary(){
        return salary;
    }
    @Override
    public String toString(){
        return "name:"+name+",age:"+age+",salary:"+salary;
    }
    public void work(){
        System.out.println(name+" work ");
    }
}