Question

我在scala中有这个类：

class AuthResponse(  val ip: String,
                         val authorized: Boolean,
                         val sid: String,
                         val uid: String,
                         val ratio: Double,
                         val skipRecording: Boolean,
                         val rejectReason: String,
                         val userTrackingState: String,
                         val pid: Int = conf.getString(s"WebRecorder.Environments.${conf.getString("WebRecorder.Current.Environment")}.Pid").toInt) {
      // If we write val before input vars it constract the same values

      //Override toString method
      override def toString: String = {
            "ip: " + ip + "\n" +
            "authorized: " + authorized + "\n" +
            "sid: " + sid + "\n" +
            "uid: " + uid + "\n" +
            "ratio: " + ratio + "\n" +
            "skipRecording: " + skipRecording + "\n" +
            "rejectReason: " + rejectReason + "\n" +
              "pid: " + pid + "\n" +
            "userTrackingState: " + userTrackingState
      }
    }

    object AuthResponse {

      def apply(ip: String, authorized: Boolean, sid: String, uid: String, ratio: Double, skipRecording: Boolean, rejectReason: String, userTrackingState: String): AuthResponse =
        new AuthResponse(ip, authorized, sid, uid, ratio, skipRecording, rejectReason, userTrackingState)

      def apply(responseAsJson: String): AuthResponse =  {
        new Gson().fromJson(responseAsJson, classOf[AuthResponse])
      }
    }

我正在尝试将其编写为java代码：

public class AuthResponse {

String ip;
Boolean authorized;
String sid;
String uid;
Double ratio;
Boolean skipRecording;
String rejectReason;
String userTrackingState;
int pid = Integer.parseInt(Configuration.prop.getProperty(""));

@Override
public String toString(){
   return
   ("ip: " + ip + "\n" +
    "authorized: " + authorized + "\n" +
    "sid: " + sid + "\n" +
    "uid: " + uid + "\n" +
    "ratio: " + ratio + "\n" +
    "skipRecording: " + skipRecording + "\n" +
    "rejectReason: " + rejectReason + "\n" +
    "pid: " + pid + "\n" +
    "userTrackingState: " + userTrackingState + "\n");
}

    class AuthResponse(){

        public AuthResponse apply(String ip,boolean authorized, String sid,String uid, double ratio,boolean skipRecording, String rejectReason, String userTrackingState){
           return new AuthResponse(ip,authorized,sid,uid,ratio,skipRecording,rejectReason,userTrackingState);
        }

        public com.pipe.pipeapp.AuthResponse apply(String responseAsJson){
            return new
        }

    }
}

我试图看看我如何在我的类中使用与scala相同的名称来实现另一个类，我们可以使用对象和类，它是完全不同的类（因为它不是类而是对象）但是在Java中我们不能这样做，我怎样才能在java中实现相同的类，包括对象类？

Answer 1

Scala object可能会被编译成不同的东西，具体取决于里面的内容。在您的情况下，object AuthResponse实际上是在static本身的类似于Java class AuthResponse方法的内容中编译的。所以它会是这样的：

public class AuthResponse {

    public final String ip;
    public final Boolean authorized;
    public final String sid;
    public final String uid;
    public final Double ratio;
    public final Boolean skipRecording;
    public final String rejectReason;
    public final String userTrackingState;
    public final int pid;


    public AuthResponse(String ip, Boolean authorized, String sid, String uid, Double ratio, Boolean skipRecording, String rejectReason, String userTrackingState, int pid) {
        this.ip = ip;
        this.authorized = authorized;
        this.sid = sid;
        this.uid = uid;
        this.ratio = ratio;
        this.skipRecording = skipRecording;
        this.rejectReason = rejectReason;
        this.userTrackingState = userTrackingState;
        this.pid = pid;
    }

    public AuthResponse(String ip, Boolean authorized, String sid, String uid, Double ratio, Boolean skipRecording, String rejectReason, String userTrackingState) {
        this(ip, authorized, sid, uid, ratio, skipRecording, rejectReason, userTrackingState, Integer.parseInt(Configuration.prop.getProperty("")));
    }


    @Override
    public String toString() {
        return
                ("ip: " + ip + "\n" +
                        "authorized: " + authorized + "\n" +
                        "sid: " + sid + "\n" +
                        "uid: " + uid + "\n" +
                        "ratio: " + ratio + "\n" +
                        "skipRecording: " + skipRecording + "\n" +
                        "rejectReason: " + rejectReason + "\n" +
                        "pid: " + pid + "\n" +
                        "userTrackingState: " + userTrackingState + "\n");
    }

    public static AuthResponse apply(String ip, boolean authorized, String sid, String uid, double ratio,
                                     boolean skipRecording, String rejectReason, String userTrackingState) {
        return new AuthResponse(ip, authorized, sid, uid, ratio, skipRecording, rejectReason, userTrackingState);
    }

    public static AuthResponse apply(String responseAsJson) {
        return new Gson().fromJson(responseAsJson, AuthResponse.class);
    }
}

虽然转到Java，但我会将apply方法重命名为更有意义的方法，例如create。你也可以为字段引入getter，而不是让它们公开，但我没有费心去缩短代码。

Answer 2

我为您提供了有助于此案例Nested Classes Java的文档。这里解释何时使用嵌套类When to Use。

如何在java中声明一个类（scala代码）中的对象类

2 个答案: