浅谈Java中的interface应用与面向接口编程

public interface SportContest {
  //开场仪式
  String announceStart();
  //举行比赛
  ResultDto playGame();
  //颁奖仪式
  String announceEnd(ResultDto resultDto);
  //举行体育赛事
  default String holdSportGame() {
      String result01 = announceStart();
      ResultDto result02 = playGame();
      String result03 = announceEnd(result02);
      return result03;
  }
}

public class TableTennisContest implements SportContest {
    //赛事任务
    private TaskDto taskDto = null;
    public TableTennisContest(TaskDto taskDto) {
        this.setTaskDto(taskDto);
    }
    @Override
    public String announceStart() {
        TaskDto taskDto = this.getTaskDto();
        System.out.println("举行乒乓球比赛入场仪式:");
        System.out.println("步骤一: " + taskDto.getEventName() + "队员入场.");
        System.out.println("步骤二: 裁判员、教练员等各就各位.");
        return "乒乓球比赛进行中";
    }
    @Override
    public ResultDto playGame() {
        TaskDto taskDto = this.getTaskDto();
        System.out.println("举行乒乓球比赛: " + taskDto.getContent() + ",选手们在奋力搏击.");
        return ResultDto.builder().teamName("中国乒乓球队").content("女单决赛冠军").build();
    }
    @Override
    public String announceEnd(ResultDto resultDto) {
        System.out.println("举行颁奖仪式: ");
        System.out.println("步骤一: 为" + resultDto.getTeamName() + resultDto.getContent() + "颁发金牌.");
        System.out.println("步骤二: 升中华人民共和国国旗,奏中华人民共和国国歌.");
        return "乒乓球比赛圆满结束";
    }
    public TaskDto getTaskDto() {
        return this.taskDto;
    }
    public void setTaskDto(TaskDto taskDto) {
        this.taskDto = taskDto;
    }
}

public class SwimmingContest implements SportContest {
  //赛事任务
  private TaskDto taskDto = null;
  public SwimmingContest(TaskDto taskDto) {
      this.setTaskDto(taskDto);
  }
  @Override
  public String announceStart() {
      TaskDto taskDto = this.getTaskDto();
      System.out.println("举行游泳比赛入场仪式:");
      System.out.println("步骤一: " + taskDto.getEventName() + "队员入场.");
      System.out.println("步骤二: 裁判员、教练员等各就各位.");
      return "游泳比赛进行中";
  }
  @Override
  public ResultDto playGame() {
      TaskDto taskDto = this.getTaskDto();
      System.out.println("举行游泳比赛: " + taskDto.getContent() + ",选手们在冲刺记录.");
      return ResultDto.builder().teamName("中国游泳队").content("男子组200米决赛冠军").build();
  }
  @Override
  public String announceEnd(ResultDto resultDto) {
      System.out.println("举行颁奖仪式: ");
      System.out.println("步骤一: 为" + resultDto.getTeamName() + resultDto.getContent() + "颁发金牌.");
      System.out.println("步骤二: 升中华人民共和国国旗,奏中华人民共和国国歌.");
      return "游泳比赛圆满结束";
  }
  public TaskDto getTaskDto() {
      return this.taskDto;
  }
  public void setTaskDto(TaskDto taskDto) {
      this.taskDto = taskDto;
  }
}

public class ApplyInterface {
  // 主函数入口
  public static void main(String[] args) {
    System.out.println("*******************************");
    holdSportGame(new TableTennisContest(TaskDto.builder().eventName("乒乓球比赛").content("女单决赛").build()));
    System.out.println("*******************************");
    holdSportGame(new SwimmingContest(TaskDto.builder().eventName("游泳比赛").content("男子200米决赛").build()));
    System.out.println("*******************************");
  }
  // 面向接口编程
  public static void holdSportGame(SportContest sportContest) {
      sportContest.holdSportGame();
  }
}

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class TaskDto implements Serializable {
    //赛事名称
    private String eventName;
    //活动内容
    private String content;
}

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class ResultDto implements Serializable {
    //竞赛队伍
    private String teamName;
    //比赛成绩
    private String content;
}