java 多变量,从Java方法返回多个变量
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);
}
}
I need m and z in another class for write them into file. Thank you.
解决方案
My first question with these sort of issues is, what's the relationship between these two results ?
If they're unrelated, does that point to your method doing two different things ?
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.
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);
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.