从Java方法返回多个变量 [英] Return more than one variable from Java method

问题描述

很抱歉愚蠢的问题... 有人可以帮我从方法中返回两个变量吗(我读了

Sorry for stupid question... Could anybody help me with returning two variable from method (I read here and tried to recode but without result).

public class FileQualityChecker {
    EnviroVars vars = new EnviroVars();  
    public int n = 0;
    public int z = 0;
    public int m = 0;
    String stringStatus;


    public void stringLenghtCheck(String pathToCheckedFile)
    {
        try{    
    FileInputStream fstream = new          FileInputStream(pathToCheckedFile+"\\"+"Test.dat");
         // Get the object of DataInputStream
         DataInputStream in = new DataInputStream(fstream);
         BufferedReader br = new BufferedReader(new InputStreamReader(in));
         String strLine;
          //Read File Line By Line
         while ((strLine = br.readLine()) != null)   
         {

           if  (
           strLine.length() == vars.strLenghtH ||
           strLine.length() == vars.strLenghtCUoriginal ||
           strLine.length() == vars.strLenghtCEAoriginal ||
           strLine.length() == vars.strLenghtCAoriginal ||
           strLine.length() == vars.strLenghtTrailer ||
           strLine.length() == vars.strLenghtLastRow 

           ) 
            {
               stringStatus = "ok";
               n++;
               z++; 

            }
           else 
           {
                stringStatus = "Fail";
                n++; 
                m++;
                }
           System.out.println (n +" " + strLine.length() +" " + stringStatus);
          }



         //Close the input stream
          in.close();
        }
        catch
        (Exception e){//Catch exception if any
         System.err.println("Error: " + e.getMessage());
         }

         /*How to return m and z from method to use these vars for writing in the file*/
         return (m, z);


        }

}

我需要在另一个类中将m和z写入文件.谢谢.

I need m and z in another class for write them into file. Thank you.

推荐答案

我遇到这类问题的第一个问题是，这两个结果之间有什么关系?

My first question with these sort of issues is, what's the relationship between these two results ?

如果它们不相关，那是否表示您的方法做了两件事?

If they're unrelated, does that point to your method doing two different things ?

如果它们是相关的(在这种情况下它们似乎是)，则将它们包装在一个自定义对象中.这使您有机会稍后在该对象中添加更多结果，并且和您可以将行为附加到该对象.

If they're related (they appear to be in this case), then wrap them in a custom object. This gives you the chance to add more results later into this object, and you can attach behaviour to this object.

您的另一种解决方案是将回调对象传递给此方法，因此您根本不返回任何内容，而是您的方法随后在该对象上调用一个方法，例如

Your other solution is to pass a callback object into this method, so you don't return anything at all, but rather your method then calls a method on this object e.g.

// do some processing
callbackObject.furtherMethod(m, n);

这具有遵循OO原理的优点，即使对象为您做事情，而不是要求他们自己做信息.

This has the advantage of following the OO principle of getting objects to do things for you, rather than asking them for info and doing it yourself.

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