I'm coding a simple program to list the files .class in a directory in recursive way.
Initially I coded this:
public class Parsing{
public static void main(String[] args) {
File f=new File(".\\");
readRecursive(f);
}
private static void readRecursive(File f) {
String[] files=f.list( new FilterByteCode());
if(null==files){
files=new String[0];
}
for(String curr: files){
File currFile=new File(curr);
System.out.println(currFile.getName());
readRecursive(currFile);
}
}
}//end parsing
class FilterByteCode implements FilenameFilter {
@Override
public boolean accept(File dir, String name) {
if(name.endsWith(".class")){
return acceptByteCode(dir);
}else{
return (null!=dir && dir.exists() && dir.isDirectory());
}
}
private boolean acceptByteCode(File dir) {
boolean res= (null!=dir && dir.exists() && dir.isFile());
return res;
}
}//FilterByteCode
But this list only the directory and subdirectories, not the file!
I solved using the FileFilter:
private static void readRecursiveFile(File f) {
File[] files=f.listFiles(new FilterByteCode2());
if(null==files){
files=new File[0];
}
for(File curr: files){
System.out.println(curr.getName());
readRecursiveFile(curr);
}
}
class FilterByteCode2 implements FileFilter {
@Override
public boolean accept(File pathname) {
if(null!=pathname && pathname.getName().endsWith(".class")){
return acceptByteCode(pathname);
}else{
return (null!=pathname && pathname.exists() && pathname.isDirectory());
}
}//accept
private boolean acceptByteCode(File dir) {
boolean res = (null != dir && dir.exists() && dir.isFile());
return res;
}
}//FilterByteCode2
and this work, listing the file .class.
I read the difference between the FileFilter and FilenameFilter but I don't found the cause of difference of behaviour.
".\\"is supposed to mean? – Adaptable