java - 将数组中的字符串映射到相应的实现类

Question

我有一个包含分割的String部分的数组:

        String[] message = input.split("\\|");
        String[] parts;

        for (String line : message) {
            parts = line.split("-");
            //insert code here
        }

分割后的

part 如下所示:

[MO, KB, 001]
[MO, PR, 001]
[MO, PR, 002]

其中 MO 表示鼠标，KB = 键盘，PR=打印机等。

1. 如何提取元素中的数字(例如 001、002)并将其添加到 Map 中以用作 Key 和 Values 是相应的设备 key ，例如MO、PR 等确保键和键值不重复？然后，这将能够循环遍历 map 并处理每个设备的键集...

    public interface Device {
       void create();
   
       void fix();
   }
   
    public Printer implements Device {
       public void create() {
           //logic to create
       } 
   

2. 当我查找要针对特定​​ key 创建的设备列表时，我应该获得映射到该 key 的设备的列表。对于每个键，我想创建映射到它的设备。例如。对于 key=001 创建 MO、PR 和 KB 设备。如何将这些 String 值设备键映射到相应的实现类，以便在调用 create() 时，它使用子类型的实现方法创 build 备。

Answer 1

import java.util.List;
import java.util.*;
import java.lang.*;
import java.io.*;

/**
 * Created by bhanu on 30/6/16.
 */
class Ideone {

    /* package whatever; // don't place package name! */

    public static void main (String[] args)
    {
        Map<String, List<String>> deviceByForename = new HashMap<String, List<String>>();
        Map<String, List<Device>> deviceMapped = new HashMap<String, List<Device>>();
        String[] parts = {"MO, KB, 001","MO, PR, 001","MO, PR, 002"};

        String[] devicesNames = null;
        for(String eachPart :parts ){
            List<String> devicename =  new ArrayList<String>();
            devicesNames = eachPart.split(",");
            if(deviceByForename.containsKey(devicesNames[2].trim()))
            {
                devicename = deviceByForename.get(devicesNames[2].trim());
                if(!devicename.contains(devicesNames[0])){
                    devicename.add(devicesNames[0]);
                }
                if(!devicename.contains(devicesNames[1].trim())){
                    devicename.add(devicesNames[1].trim());
                }
            }else {
                devicename.add(devicesNames[0]);
                devicename.add(devicesNames[1].trim());
                deviceByForename.put(devicesNames[2].trim(),devicename);
            }

        }
        Iterator it = deviceByForename.entrySet().iterator();
        while (it.hasNext()) {
            Map.Entry pair = (Map.Entry)it.next();
            List<String> devicename =  (List<String>)pair.getValue();
            List<Device> mappedDevices =  new ArrayList<Device>();

            for(String device:devicename){

            switch ( device){
                case "PR":
                    Printer print = new Printer();
                    mappedDevices.add(print);
                    break;

                case "MO":
                    Mouse mouse = new Mouse();
                    mappedDevices.add(mouse);
                    break;
            };
            }
            deviceMapped.put((String)pair.getKey(),mappedDevices);
        }
        System.out.println(deviceMapped);
    }

}
interface Device {
    void create();

    void fix();
}

class Printer implements Device {
    public void create() {
        //logic to create
    }
    public void fix() {
        //logic to create
    }
}
class Mouse implements Device {
    public void create() {
        //logic to create
    }
    public void fix() {
        //logic to create
    }
}