java - 创建 Java 类的新对象返回空对象

Question

我创建了一个新类“ServiceRequest”，如下所示。为了节省空间，我没有在此处添加 getter 和 setter。

package testListenerPackage;

import java.util.Date;

public class ServiceRequest {

public static final ServiceRequest REQUEST_ARRIVAL   = new ServiceRequest( "Request_Arrival" );
public static final ServiceRequest REQUEST_COMPLETION   = new ServiceRequest( "Request_Completion" );
public static final ServiceRequest REQUEST_UNDER_PROCESS = new ServiceRequest( "Request_Under_Process" );


private String serviceRequest;
private String requestName;
private int requestID;
private long arrivalTime;
private long startServiceTime;
private long endServiceTime;
private long totalServiceTime;

private String requestStatus;

public enum RequestStatus{
    NEW, COMPLETED
}



public ServiceRequest()
{

}
public ServiceRequest( String serviceRequest ) {
    serviceRequest = serviceRequest;
 }
}

当我尝试在其他类中创建该对象的实例时，就像这样，它返回一个空对象。

  public ServiceRequest generateServiceRequest()
{
    ServiceRequest serviceRequest = new ServiceRequest("Ali baba");
    serviceRequest.setRequestID(1);
    serviceRequest.setRequestName("Read");
    serviceRequest.setRequestStatus(ServiceRequest.REQUEST_ARRIVAL.toString());
    serviceRequest.setArrivalTime(System.currentTimeMillis());
    return serviceRequest;
}

谁能告诉我该怎么做？

Answer 1

我不喜欢这段代码:

public ServiceRequest()
{
    // all those references are null - crazy
}
public ServiceRequest(String serviceRequest ) {
    // use "this" to clarify what's initialized
    this.serviceRequest = serviceRequest;
}