我正在尝试将值传递给可能尚未声明的变量。从我的主要源类中，我给另一个类一些值，但后来似乎这些值已经消失了。
源代码：
server.java（主要）：
public class server {
public static void main(String[] args) {
//Print a simple message to the user to notify there is something going on...
System.out.println("Starting server, please wait...");
//Connecting all class files to the server.
filehandler filehandlerclass = new filehandler();
networking networkingclass = new networking();
//End of class files connecting.
//Preparing the filehandler's file information to open a new filestream.
filehandlerclass.filetohandlename = "server";
filehandlerclass.filetohandleextention = "ini";
filehandlerclass.filetohandlepath = "configs\\";
//Request a new filestream using the filehandler's file variables.
filehandlerclass.openfilestream(filehandlerclass.filestream, filehandlerclass.filetohandle);
//Checks if the filehandler has tried to open a filestream.
if(filehandlerclass.filestreamopen == true) {
//Request a check if the filestream was opened sucessfully.
filehandlerclass.filestreamexists(filehandlerclass.filestream);
}
//If the filehandler has not tried to open a filestream...
else {
System.out.println("Error: The filehandler does not seem to have tried to open a filoestream yet.");
System.out.println("A possibility is that the server could not call the method from the filehandler properly.");
}
//Checks if the boolean "filestreamexists" from the filehandlerclass is true.
if(filehandlerclass.filestreamexists(filehandlerclass.filestream) == true) {
//The filestream seems to exist, let's read the file and extract it's information.
filehandlerclass.readfile(filehandlerclass.filestream);
}
else {
filehandlerclass.openfilestream(filehandlerclass.filestream, filehandlerclass.filetohandle);
}
}
}
文件处理程序.java：
//Imports the java.io library so the filehandler can read and write to text files.
import java.io.*;
public class filehandler {
//Variables for the filehandler class.
public String filetohandlename;
public String filetohandleextention;
public String filetohandlefullname = filetohandlename + "." + filetohandleextention;
public String filetohandlepath;
public String filetohandle = filetohandlepath + filetohandlefullname;
//Boolean that is true if the filehandler's "openfilestream"-method has tried to open a filestream.
//Is false as long as none filestreams have been touched.
public boolean filestreamopen = false;
//Declares a variable for the filestream to access text files.
public File filestream;
//End of variable list.
//Called to open a filestream so the server can load properties from text files.
public void openfilestream(File filestream, String filetohandle) {
//Tell the user that a filestream is about to be opened.
System.out.println("Opening filestream for \"" + filetohandlefullname + "\"...");
//Open a filestream called "filestream" using the variable "filetohandle"'s value
//as information about wich file to open the filestream for.
filestream = new File(filetohandle);
//Turn the boolean "filestreamopen" to true so next time the server checks it's
//value, it knows if the filehandler has tried to open a filestream.
filestreamopen = true;
}
//Boolean that checks if the filestream exists.
public boolean filestreamexists(File filestream) {
//Tell the user that a check on the filestream is going on.
System.out.println("Checking if filestream for \"" + filetohandlefullname + "\" exists...");
//If the filestream exists...
if(filestream.exists()) {
//Tell the user that the filestream exists.
System.out.println("Filestream for \"" + filetohandlefullname + "\" exists!");
//Make the boolean's value positive.
return true;
}
//If the filestream does not exist...
else {
//Tell the user that the filestream does not exist.
System.out.println("Filestream for \"" + filetohandlefullname + "\" does not exist!");
//Make the boolean's value negative.
return false;
}
}
//Called to read files and collect it's information.
public void readfile(File filestream) {
//Checks if the file that is going to be read is a configuration file.
if(filetohandleextention == "ini") {
//Tell the user that a configuration file is going to be read.
System.out.println("Extracting information from the configuration file \"" + filetohandle + "\".");
}
}
}
网络.java：
public class networking {
}
问题：
server.java 将为源文件提供命令并告诉他们该做什么。除非 server.java 给了它们一个命令，否则源文件不会自行运行。通过这种方式，我计划能够在 server.java 中编写简单的函数调用，以从不同的源文件中执行更大的任务。
server.java 似乎在声明变量之前传递了变量“filetohandlename”、“filetohandleextention”和“filetohandlepath”，当它们被声明时，它们被声明为“null”作为值。
结果：
编译时没有错误。我认为正在发生的只是与指定要读取的文件的正确值的变量不匹配。它还会引发一个我暂时不关心的异常，要么是因为“null.null”不存在，要么是我写错了代码。
最终要求：
有谁知道我是否可以制作一种接收变量值的方法，或者是否有另一种更合适的方法？我可以在 server.java 中创建一个变量数组并从该数组中收集值吗？
非常感谢您的参与。