我试图弄清楚我将如何在以下情况下进行超类调用。
正如您将在下面看到的，我正在扩展的类的子类在其构造函数中只有一个参数，而超类有两个。
下面是我的代码：
import java.io.*;
import java.util.*;
public class DirectorySize extends DirectoryProcessor
{
/*
Dan Czarnecki
October 29, 2013
Class variables:
private HashMap<File, DirectoryStatistics> directory
A HashMap object that will contain the files and folders
within a directory
Constructors:
public DirectorySize(File startingDirectory) throws FileNotFoundException
Creates a DirectorySize object, takes in a pathname (inherited from DirectoryProcessor class,
and has a single hashmap of a DirectoryStatistics object to hold the files and folders
within a directory
Methods:
public void processFile(File file)
A method that searches for all the files and folders
within a directory and calculated the total size
for each of them
public void run()
Calls the processFile() method and prints out
the files and folders (along with their sizes)
in the directory
public String toString()
Returns each element in the directory Vector
Modification History
October 29, 2013
Original version of class
Implemented run() and processFile() methods
October 30, 2013
Added implementation of FileFilter to processFile() method
*/
private HashMap<File, DirectoryStatistics> directory;
public DirectorySize(File startingDirectory) throws FileNotFoundException
{
super(startingDirectory);
directory = new HashMap <File, DirectoryStatistics>();
}
public void processFile(File file, FileFilter fileFilter) throws FileNotFoundException
{
DirectoryStatistics parent;
int index;
File parentFile;
boolean find;
parentFile = file.getParentFile();
parent = new DirectoryStatistics(parentFile);
find = directory.containsValue(parent);
if(find)
{
directory.put(parentFile, parent);
directory.get(parentFile).setSizeInBytes(file.length());
directory.get(parentFile).incrementFileCount();
}
if(find)
{
directory.get(find).addToSizeInBytes(file.length()); //increments the total size of the directory
directory.get(find).incrementFileCount(); //increments the number of files in the directory
}
}
public void run() throws FileNotFoundException
{
File file;
file = directoryLister.next();
while(file != null) //the following will be called when the File object is not null
{
processFile(file, fileFilter);
file = directoryLister.next();
}
}
public String toString()
{
Set<File> parentFile = directory.keySet();
File[] parentFileArray = parentFile.toArray(new File[0]);
String str; //creates a new string that will hold the file or directory name
str = "";
for(int i = 0; i < parentFileArray.length; i++)
{
str = str + directory.get(parentFileArray[i]).toString();
}
return str;
}
}
import java.io.*;
abstract public class DirectoryProcessor extends DirectoryLister
{
/*
Dan Czarnecki
October 14, 2013
Class variables:
private DirectoryLister directoryLister
A variable of type DirectoryLister that will list all the directories from a given pathname
Constructors:
public DirectoryProcessor(File startingDirectory) throws FileNotFoundException
Makes a super call to the startingDirectory variable, creates a new DirectoryLister object
Methods:
abstract public void processFile(File file, FileFilter fileFilter)
This abstract method's function is implemented in the TotalFileSize class to process each file within a directory and return the total size of them
public void run()
Basically takes the functionality what was originally done with our FileLister and DirectoryLister class (within the driver class)
but has now moved to its own method
Modification History:
October 14, 2013
Original version of class
October 16, 2013
Class and processFile() method have been made abstract
October 30, 2013
*/
public DirectoryLister directoryLister;
public FileFilter fileFilter;
public DirectoryProcessor(File startingDirectory, FileFilter fileFilter) throws FileNotFoundException
{
super(startingDirectory);
directoryLister = new DirectoryLister(startingDirectory);
fileFilter = this.fileFilter;
}
abstract public void processFile(File file, FileFilter fileFilter) throws FileNotFoundException;
public void run() throws FileNotFoundException
{
File file;
file = directoryLister.next();
while(file != null) //the following will be called when the File object is not null
{
processFile(file, fileFilter);
file = directoryLister.next();
}
}
}
在这种情况下如何进行超类调用？