import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
public class FileSorter {
/** ------------------------------------------------------------ */
/** Date struct for proper date handling */
/** ------------------------------------------------------------ */
static class Date {
int year;
int month;
int day;
Date(int y, int m, int d) {
this.year = y;
this.month = m;
this.day = d;
}
/** ------------------------------------------------------------ */
/** Print a date in YYYY-MM-DD format */
/** ------------------------------------------------------------ */
String format() {
return String.format("%04d-%02d-%02d", year, month, day);
}
}
/** ------------------------------------------------------------ */
/** File entry struct */
/** ------------------------------------------------------------ */
static class FileEntry {
String name; // file name without extension
String extension; // extension including dot
Date date; // real date struct
int size; // bytes
FileEntry(String name, String ext, Date date, int size) {
this.name = name;
this.extension = ext;
this.date = date;
this.size = size;
}
}
/** ------------------------------------------------------------ */
/** Sort by name (lexicographically) */
/** ------------------------------------------------------------ */
static void sortByName(List<FileEntry> files) {
files.sort(Comparator.comparing(f -> f.name));
}
/** ------------------------------------------------------------ */
/** Sort by extension (lexicographically) */
/** ------------------------------------------------------------ */
static void sortByExtension(List<FileEntry> files) {
files.sort(Comparator.comparing(f -> f.extension));
}
/** ------------------------------------------------------------ */
/** Sort by date (year → month → day) */
/** ------------------------------------------------------------ */
static void sortByDate(List<FileEntry> files) {
files.sort(Comparator
.comparing((FileEntry f) -> f.date.year)
.thenComparing(f -> f.date.month)
.thenComparing(f -> f.date.day));
}
/** ------------------------------------------------------------ */
/** Sort by size (ascending) */
/** ------------------------------------------------------------ */
static void sortBySize(List<FileEntry> files) {
files.sort(Comparator.comparingInt(f -> f.size));
}
/** ------------------------------------------------------------ */
/** Print file list */
/** ------------------------------------------------------------ */
static void printFiles(List<FileEntry> files) {
for (FileEntry f : files) {
System.out.println(f.name + f.extension + " "
+ f.date.format() + " "
+ f.size + " bytes");
}
System.out.println();
}
public static void main(String[] args) {
List<FileEntry> files = new ArrayList<>();
files.add(new FileEntry("G1zTo5jJk", ".jpg", new Date(2007,7,8), 51954));
files.add(new FileEntry("LTEE4SI0j", ".jpg", new Date(2011,11,13), 43442));
files.add(new FileEntry("PDqmuO3GH", ".cpp", new Date(2004,5,21), 3346));
files.add(new FileEntry("qJO2qjukZ", ".png", new Date(2010,8,27), 67087));
files.add(new FileEntry("HqclTqxb4", ".cpp", new Date(2020,9,5), 70531));
files.add(new FileEntry("imVyTyoaF", ".jpg", new Date(2011,3,19), 43846));
files.add(new FileEntry("rXwXdy8XO", ".txt", new Date(2017,10,12), 70193));
files.add(new FileEntry("9Z4fbOBUc", ".pdf", new Date(2004,6,9), 1754));
files.add(new FileEntry("ZHahuu4vS", ".txt", new Date(2003,10,10), 65126));
files.add(new FileEntry("0SnZHh2GT", ".png", new Date(2006,10,18), 25890));
System.out.println("Original:");
printFiles(files);
System.out.println("Sorted by name:");
sortByName(files);
printFiles(files);
System.out.println("Sorted by extension:");
sortByExtension(files);
printFiles(files);
System.out.println("Sorted by date:");
sortByDate(files);
printFiles(files);
System.out.println("Sorted by size:");
sortBySize(files);
printFiles(files);
}
}
/*
run:
Original:
G1zTo5jJk.jpg 2007-07-08 51954 bytes
LTEE4SI0j.jpg 2011-11-13 43442 bytes
PDqmuO3GH.cpp 2004-05-21 3346 bytes
qJO2qjukZ.png 2010-08-27 67087 bytes
HqclTqxb4.cpp 2020-09-05 70531 bytes
imVyTyoaF.jpg 2011-03-19 43846 bytes
rXwXdy8XO.txt 2017-10-12 70193 bytes
9Z4fbOBUc.pdf 2004-06-09 1754 bytes
ZHahuu4vS.txt 2003-10-10 65126 bytes
0SnZHh2GT.png 2006-10-18 25890 bytes
Sorted by name:
0SnZHh2GT.png 2006-10-18 25890 bytes
9Z4fbOBUc.pdf 2004-06-09 1754 bytes
G1zTo5jJk.jpg 2007-07-08 51954 bytes
HqclTqxb4.cpp 2020-09-05 70531 bytes
LTEE4SI0j.jpg 2011-11-13 43442 bytes
PDqmuO3GH.cpp 2004-05-21 3346 bytes
ZHahuu4vS.txt 2003-10-10 65126 bytes
imVyTyoaF.jpg 2011-03-19 43846 bytes
qJO2qjukZ.png 2010-08-27 67087 bytes
rXwXdy8XO.txt 2017-10-12 70193 bytes
Sorted by extension:
HqclTqxb4.cpp 2020-09-05 70531 bytes
PDqmuO3GH.cpp 2004-05-21 3346 bytes
G1zTo5jJk.jpg 2007-07-08 51954 bytes
LTEE4SI0j.jpg 2011-11-13 43442 bytes
imVyTyoaF.jpg 2011-03-19 43846 bytes
9Z4fbOBUc.pdf 2004-06-09 1754 bytes
0SnZHh2GT.png 2006-10-18 25890 bytes
qJO2qjukZ.png 2010-08-27 67087 bytes
ZHahuu4vS.txt 2003-10-10 65126 bytes
rXwXdy8XO.txt 2017-10-12 70193 bytes
Sorted by date:
ZHahuu4vS.txt 2003-10-10 65126 bytes
PDqmuO3GH.cpp 2004-05-21 3346 bytes
9Z4fbOBUc.pdf 2004-06-09 1754 bytes
0SnZHh2GT.png 2006-10-18 25890 bytes
G1zTo5jJk.jpg 2007-07-08 51954 bytes
qJO2qjukZ.png 2010-08-27 67087 bytes
imVyTyoaF.jpg 2011-03-19 43846 bytes
LTEE4SI0j.jpg 2011-11-13 43442 bytes
rXwXdy8XO.txt 2017-10-12 70193 bytes
HqclTqxb4.cpp 2020-09-05 70531 bytes
Sorted by size:
9Z4fbOBUc.pdf 2004-06-09 1754 bytes
PDqmuO3GH.cpp 2004-05-21 3346 bytes
0SnZHh2GT.png 2006-10-18 25890 bytes
LTEE4SI0j.jpg 2011-11-13 43442 bytes
imVyTyoaF.jpg 2011-03-19 43846 bytes
G1zTo5jJk.jpg 2007-07-08 51954 bytes
ZHahuu4vS.txt 2003-10-10 65126 bytes
qJO2qjukZ.png 2010-08-27 67087 bytes
rXwXdy8XO.txt 2017-10-12 70193 bytes
HqclTqxb4.cpp 2020-09-05 70531 bytes
*/
