Thread: Java Course Issues (Mod 5)

Please post your code here on the forum and some specific questions about the code.

Sorry for the delay. Below is the portion of code I am referring to and below that is the portion which is referenced in the code. Code makes a note of Module 3 that working function is at the bottom. My questions an thoughts are:
After numerous attempts, I still am unsure how to pass back and forth in conjunction with the multidimensional array, that why I added the vector.
I keep getting "Type mismatch" errors using vectors, I know why I get the error just don't know the fix, and correct way. The function gui.updateListing is expecting a vector, I know the way I am forming my vector is wrong.

[DirectoryLister.Java]

	/** Vector of Vectors to store the information for the files/subfolders of the selected folder */
	//TODO
	private Vector[][] folderContents = new Vector[100][4];
...
.....
.....
...
 
	/**
	 *	Show the directory listing.
	 *	An error message is displayed if basePath does not represent a valid directory.
	 * 
	 *	@param	basePath		the absolute path of a directory in the file system.
	 */
	public void showDirectoryContents(String basePath)
	{
		// TODO
		// This method should function exactly as it did in the Module 3 assignment,
		// except after the selected directory has been enumerated, the contents should be
		// sorted in ascending order based on the path of the files/subfolders.
 
		try{
 
			File path = new File(basePath);
			if (!path.isDirectory()){
				throw new IOException();
			}
			Vector[] a = new Vector[4] {path.getAbsolutePath(),getSizeString(path.length()),"Folder",formattedDateString(path.lastModified())};
			gui.updateListing(a);
 
			String [] tree = path.list();
			enumerateDirectory(path);
		}catch(NullPointerException e){
			JOptionPane.showMessageDialog(null, "No Directory selected.", "ERROR", JOptionPane.ERROR_MESSAGE);
		}catch(IOException f){
			JOptionPane.showMessageDialog(null, "No Directory selected.", "ERROR", JOptionPane.ERROR_MESSAGE);
		}
	}
 
 
[GUI.java]
	/**
	 *	Update the table with the specified file/folder information.
	 *	The Vector folderContents is a Vector of Vectors, where each Vector represents the
	 *	information for each file/folder and occupies a single row in the table.
	 *
	 *	Information is displayed in the following order:
	 *
	 *		Column 1: absolute path of file or folder
	 *		Column 2: size of file in kilobytes, or "" for folders
	 *		Column 3: type - "File" or "Folder"
	 *		Column 4: date last modified in format: month/day/year hour:minute:second AM/PM
	 */
	public void updateListing(Vector folderContents)
	{
		clearTable();
 
		for (Iterator itr = folderContents.iterator(); itr.hasNext(); )
		{
			Vector row = (Vector)itr.next();
 
			tableModel.addRow(new String[] {" " + (String)row.get(0),
											getSizeString((Long)row.get(1)) + " ",
											" " + (String)row.get(2),
											" " + formattedDateString((Long)row.get(3))});
		}
	}
 
[Mod3][DirectoryLister.Java]
	public void showDirectoryContents(String basePath)
	{
		// TODO
		try{
 
			File path = new File(basePath);
			if (!path.isDirectory()){
				throw new IOException();
			}
			gui.updateListing(path.getAbsolutePath(),getSizeString(path.length()),"Folder",formattedDateString(path.lastModified()));
 
			String [] tree = path.list();
			enumerateDirectory(path);
		}catch(NullPointerException e){
			JOptionPane.showMessageDialog(null, "No Directory selected.", "ERROR", JOptionPane.ERROR_MESSAGE);
		}
		catch(IOException f){
			JOptionPane.showMessageDialog(null, "No Directory selected.", "ERROR", JOptionPane.ERROR_MESSAGE);
		}
	}

I keep getting "Type mismatch" errors

Please copy the full text of the error messages and paste it here.

Please copy the full text of the error messages and paste it here. The error messages give inportant info about the errors. Here is a sample:

TestSorts.java:138: cannot find symbol
symbol  : variable var
location: class TestSorts
         var = 2;
         ^

cannot convert from String to Vector DirectoryLister.java /mod5/src line 133

What statement is at line 133? The compiler objects to the code trying to convert a String to a Vector.

The compiler is complaining that the items in {} are not Vectors. If you wan to put items into a Vector, use the Vector class's add() method.