[Java] Collections Sort Example (String with Numbers)

1. Collections Sort Example

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import java.io.File; import java.io.IOException; import java.util.Arrays; import java.util.Collections; import java.util.Comparator; import java.util.List; import org.apache.commons.compress.archivers.zip.ZipArchiveEntry; import net.lingala.zip4j.model.FileHeader; public class SortUtil { public static int compareStringNumber(String s1, String s2) { String[] s1Parts = s1.split("(?<=\\D)(?=\\d)|(?<=\\d)(?=\\D)"); String[] s2Parts = s2.split("(?<=\\D)(?=\\d)|(?<=\\d)(?=\\D)"); int i = 0; while(i < s1Parts.length && i < s2Parts.length){ if(s1Parts[i].compareTo(s2Parts[i]) == 0){ //if parts are the same ++i; }else{ try{ int intS1 = Integer.parseInt(s1Parts[i]); int intS2 = Integer.parseInt(s2Parts[i]); int diff = intS1 - intS2; if(diff == 0){ ++i; }else{ return diff; } }catch(Exception ex){ return s1.compareTo(s2); } } } if(s1.length() < s2.length()){ return -1; }else if(s1.length() > s2.length()){ return 1; }else{ return 0; } } public static void sortStringNumber(List<String> strings) { Collections.sort(strings, new Comparator<String>() { public int compare(String s1, String s2) { return compareStringNumber(s1, s2); } }); } public static void sortFiles(List<File> strings) { Collections.sort(strings, new Comparator<File>() { public int compare(File s1, File s2) { return compareStringNumber(s1.getPath(), s2.getPath()); } }); } public static void sortZipFileHeader(List<FileHeader> strings) { Collections.sort(strings, new Comparator<FileHeader>() { public int compare(FileHeader f1, FileHeader f2) { return compareStringNumber(f1.getFileName(), f2.getFileName()); } }); } public static void sortZipEntry(List<ZipArchiveEntry> strings) { Collections.sort(strings, new Comparator<ZipArchiveEntry>() { public int compare(ZipArchiveEntry f1, ZipArchiveEntry f2) { return compareStringNumber(f1.getName(), f2.getName()); } }); } }