将1传递给相同对象类型的许多参数 [英] Passing 1 to many parameters of same object type

问题描述

我需要为使用以前工作流的1个或多个输出的不同工作流建立一组输入，当我这样做时

  public interface InputBuilder< I扩展了SwfInput，O扩展了SwfOutput> {
 
 public I buildInput（O ... output）; 
 
 
 $ b public class SwfAuthorisationInputBuilder实现了InputBuilder {
 $ b $ @Override 
 public SwfAuthorisationInput buildInput（SwfOutput swfEventInitOutput）{
 
 SwfEventInitOutput输出=（SwfEventInitOutput）swfEventInitOutput; 
 SwfAuthorisationInput authorisationInput = oddFactory.newInstance（SwfAuthorisationInput.class）; 
 authorisationInput.setNetworkEvent（output.getNetworkEvent（））; 
 
返回authorisationInput; 
} 
  

我收到并发现错误，Netbeans tip fix给了我这个。我在这里做错了什么？

  @Override 
 public SwfInput buildInput（SwfOutput ... output）{
 throw new UnsupportedOperationException（还不支持。）; //要更改生成方法的主体，请选择工具|模板。 
} 
  

这是确切的错误

方法不会覆盖或实现超类型的方法

我如何避免投射在这里？
$ b $ pre $ @Override
public SwfAuthorisationInput buildInput（SwfOutput ... output）{
SwfEventInitOutput swfEventInitOutput = （SwfEventInitOutput）输出[0];
SwfLocationDetectionOutput swfLocationDetectionOutput =（SwfLocationDetectionOutput）output [1];


SwfAuthorisationInput authorisationInput = oddFactory.newInstance（SwfAuthorisationInput.class）;
authorisationInput.setNetworkEvent（swfEventInitOutput.getNetworkEvent（））;

返回authorisationInput;
}


解决方案

  buildInput（SwfOutput swfEventInitOutput）
  

和

  buildInput（SwfOutput ... swfEventInitOutput）
  

是不同的方法签名（方法名称和Java中的参数类型）。如果您想重写一个方法，您必须 *指定来自父类的签名。
$ b

---

正如我所看到的，你只需要这个数组的一个元素。如果是这样，你可以在数组之前从数组中检出数组的大小：

  swfEventInitOutput element = swfEventInitOutput.length> 0？ swfEventInitOutput [0]：null; 
 if（element！= null）{...} 
  

另一种方法是迭代（swfEventInitOutput元素：swfEventInitOutput）{...} $ b在数组上执行这些操作：

  $ b  

---

另外，我建议你指定泛型类型重新实现 InputBuilder 接口。它可以帮助您避免在重写的方法中出现铸件（您所做的）。

这里的一个积极方面是您使用了有界的泛型类型，它阻止了 Object ... （或 Object [] ）。

I need to build a set of input for different workflows using 1 or more outputs from previous workflows, when i do this

public interface InputBuilder<I extends SwfInput, O extends SwfOutput> {

    public I buildInput(O... output);
}


public class SwfAuthorisationInputBuilder implements InputBuilder {

    @Override
    public SwfAuthorisationInput buildInput(SwfOutput swfEventInitOutput) {

        SwfEventInitOutput output = (SwfEventInitOutput ) swfEventInitOutput;
        SwfAuthorisationInput authorisationInput = oddFactory.newInstance(SwfAuthorisationInput.class);
        authorisationInput.setNetworkEvent(output.getNetworkEvent());

        return authorisationInput;
    } 

I am getting and error and Netbeans tip fix gives me this. What am i doing wrong here ?

  @Override
        public SwfInput buildInput(SwfOutput... output) {
            throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
        }

this is the exact error

method does not override or implement a method from a supertype

How can i avoid casting here ?

  @Override
        public SwfAuthorisationInput buildInput(SwfOutput... output) {
            SwfEventInitOutput swfEventInitOutput = (SwfEventInitOutput ) output[0];
            SwfLocationDetectionOutput swfLocationDetectionOutput = (SwfLocationDetectionOutput) output[1];


            SwfAuthorisationInput authorisationInput = oddFactory.newInstance(SwfAuthorisationInput.class);
            authorisationInput.setNetworkEvent(swfEventInitOutput.getNetworkEvent());

            return authorisationInput;
        }

解决方案

buildInput(SwfOutput swfEventInitOutput)

and

buildInput(SwfOutput... swfEventInitOutput)

are the different method signatures (the method's name and the parameter types in Java). If you want to override a method, you have to exactly * specify a signature from the parent class.

---

As I can see, you need only one element of this array. If so, you could pull out it from the array checking the array's size before:

swfEventInitOutput element = swfEventInitOutput.length > 0 ? swfEventInitOutput[0] : null;
if(element != null) { ... }

Another way is to iterate over the array and perform such actions for an each element:

for (swfEventInitOutput element : swfEventInitOutput) { ... }

---

In addition, I would suggest you specify generic types when you're implementing the InputBuilder interface. It helps you to avoid castings (which you did) inside overridden methods.

A positive side here is that you used bounded generics types, it has prevented from Object... (or Object[]).

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