Java接口回調代碼展示

        在我們的開發過程中，Java回調是我們經常使用到的，比如我們的Thread的內部封裝，還有我們的網絡異步請求回調等等功能都有使用到我們的Java回調，本文主要記錄一下Java回調的開發過程。

1. Demo目錄結構爲：

   IWeatherUtils	定義接口
   Main	運行演示
   Weather	實體類
   WeatherUtils	實現接口工具類

2. 代碼展示：

• IWeatherUtils：

  package com.clover.InterfaceCallBack;
  
  public interface IWeatherUtils {
  
      void getWeather(String city, CallBack callBack);
  
      interface CallBack {
          void success(Weather weather);
  
          void error(String msg);
      }
  }
  

• Main：

  package com.clover.InterfaceCallBack;
  
  public class Main {
  
      public static void main(String[] args) {
  
          WeatherUtils weatherUtils = new WeatherUtils();
          weatherUtils.getWeather("北京", new IWeatherUtils.CallBack() {
              @Override
              public void success(Weather weather) {
                  System.out.println(weather.getMsg());
              }
  
              @Override
              public void error(String msg) {
                  System.out.println(msg);
              }
          });
  
      }
  }
  

   

• Weather：

  package com.clover.InterfaceCallBack;
  
  public class Weather {
  
      //城市
      private String city;
      //天氣信息
      private String msg;
  
      public String getCity() {
          return city;
      }
  
      public void setCity(String city) {
          this.city = city;
      }
  
      public String getMsg() {
          return msg;
      }
  
      public void setMsg(String msg) {
          this.msg = msg;
      }
  }
  

   

• WeatherUtils：

  package com.clover.InterfaceCallBack;
  
  public class WeatherUtils implements IWeatherUtils {
  
      @Override
      public void getWeather(String city, CallBack callBack) {
  
          Weather weather = new Weather();
          weather.setCity(city);
          switch (city) {
              case "北京": {
                  String msg = city + "今天霧霾嚴重，空氣質量差，建議在家刷劇玩遊戲！";
                  weather.setMsg(msg);
                  callBack.success(weather);
                  break;
              }
              case "廣州": {
                  String msg = city + "今天晴朗，空氣質量優，適合出行！";
                  weather.setMsg(msg);
                  callBack.success(weather);
                  break;
              }
              case "上海": {
                  String msg = city + "今天有大暴雨，建議出門帶傘！";
                  weather.setMsg(msg);
                  callBack.success(weather);
                  break;
              }
              case "深圳": {
                  String msg = city + "今天高溫，建議在家吹空調！";
                  weather.setMsg(msg);
                  callBack.success(weather);
                  break;
              }
              default: {
                  callBack.error(city + "天氣獲取失敗！");
              }
          }
      }
  }
  

  https://github.com/LeeckyNTG/JavaCode.git