此次修改代码，计算代码行的目标在下面是完美的代码..
/**
* @param args
* @throws FileNotFoundException
*/
private static int totalLineCount = 0;
private static int totalFileScannedCount = 0;
public static void main(final String[] args) throws Exception {
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new java.io.File("C:" + File.separator));
chooser.setDialogTitle("FILES ALONG WITH LINE NUMBERS");
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
chooser.setAcceptAllFileFilterUsed(false);
if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
Map<File, Integer> result = new HashMap<File, Integer>();
File directory = new File(chooser.getSelectedFile().getAbsolutePath());
List<File> files = getFileListing(directory);
// print out all file names, in the the order of File.compareTo()
for (File file : files) {
// System.out.println("Directory: " + file);
getFileLineCount(result, file);
//totalFileScannedCount += result.size(); //saral
}
System.out.println("*****************************************");
System.out.println("FILE NAME FOLLOWED BY LOC");
System.out.println("*****************************************");
for (Map.Entry<File, Integer> entry : result.entrySet()) {
System.out.println(entry.getKey().getAbsolutePath() + " ==> " + entry.getValue());
}
System.out.println("*****************************************");
System.out.println("SUM OF FILES SCANNED ==>" + "\t" + totalFileScannedCount);
System.out.println("SUM OF ALL THE LINES ==>" + "\t" + totalLineCount);
}
}
public static void getFileLineCount(final Map<File, Integer> result, final File directory)
throws FileNotFoundException {
File[] files = directory.listFiles(new FilenameFilter() {
public boolean accept(final File directory, final String name) {
if (name.endsWith(".java")) {
return true;
} else {
return false;
}
}
});
for (File file : files) {
if (file.isFile()) {
Scanner scanner = new Scanner(new FileReader(file));
int lineCount = 0;
totalFileScannedCount ++; //saral
try {
/*for (lineCount = 0; scanner.nextLine() != null;lineCount++ ) { //saral
;
}*/
while (scanner.hasNextLine()) {
String line = scanner.nextLine().trim();
if (!line.isEmpty()) {
System.out.println("debug-->"+line); // to debug cross checked that no whitespaces are there
lineCount++;
}
}
result.put(file, lineCount);
totalLineCount += lineCount;
} catch (NoSuchElementException e) {
e.printStackTrace();
}
}
}
}
/**
* Recursively walk a directory tree and return a List of all Files found;
* the List is sorted using File.compareTo().
*
* @param aStartingDir
* is a valid directory, which can be read.
*/
static public List<File> getFileListing(final File aStartingDir) throws FileNotFoundException {
validateDirectory(aStartingDir);
List<File> result = getFileListingNoSort(aStartingDir);
Collections.sort(result);
return result;
}
// PRIVATE //
static private List<File> getFileListingNoSort(final File aStartingDir) throws FileNotFoundException {
List<File> result = new ArrayList<File>();
File[] filesAndDirs = aStartingDir.listFiles();
List<File> filesDirs = Arrays.asList(filesAndDirs);
for (File file : filesDirs) {
if (file.isDirectory()) {
result.add(file);
}
if (!file.isFile()) {
// must be a directory
// recursive call!
List<File> deeperList = getFileListingNoSort(file);
result.addAll(deeperList);
}
}
return result;
}
/**
* Directory is valid if it exists, does not represent a file, and can be
* read.
*/
static private void validateDirectory(final File aDirectory) throws FileNotFoundException {
if (aDirectory == null) {
throw new IllegalArgumentException("Directory should not be null.");
}
if (!aDirectory.exists()) {
throw new FileNotFoundException("Directory does not exist: " + aDirectory);
}
if (!aDirectory.isDirectory()) {
throw new IllegalArgumentException("Is not a directory: " + aDirectory);
}
if (!aDirectory.canRead()) {
throw new IllegalArgumentException("Directory cannot be read: " + aDirectory);
}
}
但问题是，当它在控制台上显示结果时会抛出以下异常，请告知如何克服该错误
*****************************************
FILE NAME FOLLOWED BY LOC
*****************************************
C:\Users\vaio\Desktop\Demo\fg\src\asd\abv.java ==> 9
*****************************************
SUM OF FILES SCANNED ==> 1
SUM OF ALL THE LINES ==> 9
Exception while removing reference: java.lang.InterruptedException
java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at sun.java2d.Disposer.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
答案 0 :(得分：1)
问题是您正在更新totalLineCount块内的catch。把它移到外面。
} catch (NoSuchElementException e) {
result.put(file, lineCount); // <--
totalLineCount += lineCount; // <--
}
到
result.put(file, lineCount);
totalLineCount += lineCount;
} catch (NoSuchElementException e) {
e.printStackTrace();
}
答案 1 :(得分：0)
您只在发生NoSuchElement异常时更新totalLineCount。你应该把它移到try catch语句之外，或者把它放在finally块中。
答案 2 :(得分：0)
你有
totalLineCount += lineCount;
在一个catch块中，但在try块内部我没有看到任何会导致NoSuchElementException被抛出的东西。将catch块代码移动到try块，代码似乎不适合作为exceptio处理程序。至少如果你仍然想要执行它，即使发生异常，也要把它放在finally块中。
答案 3 :(得分：0)
我修改了您的代码，尝试了解我为使您的代码工作所做的工作 -
public class LineCount{
private static int totalLineCount = 0;
private static int totalFileScannedCount = 0;
public static void main(final String[] args) throws FileNotFoundException {
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new java.io.File("C:" + File.separator));
chooser.setDialogTitle("FILES ALONG WITH LINE NUMBERS");
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
chooser.setAcceptAllFileFilterUsed(false);
if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
Map<File, Integer> result = new HashMap<File, Integer>();
File directory = new File(chooser.getSelectedFile().getAbsolutePath());
List<File> files = getFileListing(directory);
// print out all file names, in the the order of File.compareTo()
for (File file : files) {
// System.out.println("Directory: " + file);
result = getFileLineCount(result, file);
totalFileScannedCount += result.size(); //saral
}
System.out.println("*****************************************");
System.out.println("FILE NAME FOLLOWED BY LOC");
System.out.println("*****************************************");
for (Map.Entry<File, Integer> entry : result.entrySet()) {
System.out.println(entry.getKey().getAbsolutePath() + " ==> " + entry.getValue());
}
System.out.println("*****************************************");
System.out.println("SUM OF FILES SCANNED ==>" + "\t" + totalFileScannedCount);
System.out.println("SUM OF ALL THE LINES ==>" + "\t" + totalLineCount);
}
}
public static Map<File, Integer> getFileLineCount(final Map<File, Integer> result, final File file)
throws FileNotFoundException {
if (file.isFile()) {
Scanner scanner = new Scanner(new FileReader(file));
int lineCount = 0;
// totalFileScannedCount ++; //saral
try {
/*for (lineCount = 0; scanner.nextLine() != null; ) { //saral
;
}*/
while (scanner.hasNextLine()) {
String line = scanner.nextLine().trim();
if (!line.isEmpty()) {
System.out.println("debug-->"+line); // to debug cross checked that no whitespaces are there
lineCount++;
}
}
} catch (NoSuchElementException e) {
}
result.put(file, lineCount);
totalLineCount += lineCount;
}
return result;
}
//}
/**
* Recursively walk a directory tree and return a List of all Files found;
* the List is sorted using File.compareTo().
*
* @param aStartingDir
* is a valid directory, which can be read.
*/
static public List<File> getFileListing(final File aStartingDir) throws FileNotFoundException {
validateDirectory(aStartingDir);
List<File> result = getFileListingNoSort(aStartingDir);
Collections.sort(result);
return result;
}
// PRIVATE //
static private List<File> getFileListingNoSort(final File aStartingDir) throws FileNotFoundException {
List<File> result = new ArrayList<File>();
File[] filesAndDirs = aStartingDir.listFiles(new FilenameFilter() {
public boolean accept(final File directory, final String name) {
if (name.endsWith(".java")) {
return true;
} else {
return false;
}
}
});
List<File> filesDirs = Arrays.asList(filesAndDirs);
for (File file : filesDirs) {
if (file.isFile()) {
result.add(file);
}
if (!file.isFile()) {
// must be a directory
// recursive call!
List<File> deeperList = getFileListingNoSort(file);
result.addAll(deeperList);
}
}
return result;
}
/**
* Directory is valid if it exists, does not represent a file, and can be
* read.
*/
static private void validateDirectory(final File aDirectory) throws FileNotFoundException {
if (aDirectory == null) {
throw new IllegalArgumentException("Directory should not be null.");
}
if (!aDirectory.exists()) {
throw new FileNotFoundException("Directory does not exist: " + aDirectory);
}
if (!aDirectory.isDirectory()) {
throw new IllegalArgumentException("Is not a directory: " + aDirectory);
}
if (!aDirectory.canRead()) {
throw new IllegalArgumentException("Directory cannot be read: " + aDirectory);
}
}
}
我将上面的java文件放在一个文件夹中并运行此代码 - 结果如下 -
LOC后面的文件名
/home/hkr/Desktop/LineCount.java ==＆gt; 129
扫描的文件的总和==＆gt; 1 所有线条的总和==＆gt; 129