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(我读了此处并尝试重新编码，但没有结果.
Sorry for stupid question...Could anybody help me with returning two variable from method (I read hereand 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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