Java - 按文件大小、名称、日期排序

喜欢ヅ旅行 2022-05-29 03:45 212阅读 0赞

package chimomo.learning.java.code.file;
    
    import java.io.File;
    import java.util.Arrays;
    import java.util.Collections;
    import java.util.Date;
    import java.util.List;
    
    /**
     * @author Created by Chimomo
     */
    public class FileSorter {
        // Sort by file size.
        public static void sortBySize(String dir) {
            List<File> files = Arrays.asList(new File(dir).listFiles());
            Collections.sort(files, (File f1, File f2) -> {
                long diff = f1.length() - f2.length();
                if (diff > 0) {
                    return 1;
                } else if (diff == 0) {
                    return 0;
                } else {
                    return -1;
                }
            });
            for (File f : files) {
                if (f.isDirectory()) {
                    continue;
                }
                System.out.println(f.getName() + ":" + f.length());
            }
        }
    
        // Sort by name.
        public static void sortByName(String dir) {
            List<File> files = Arrays.asList(new File(dir).listFiles());
            Collections.sort(files, (File f1, File f2) -> {
                if (f1.isDirectory() && f2.isFile()) {
                    return -1;
                }
                if (f1.isFile() && f2.isDirectory()) {
                    return 1;
                }
                return f1.getName().compareTo(f2.getName());
            });
            for (File f : files) {
                System.out.println(f.getName());
            }
        }
    
        // Sort by date.
        public static void sortByDate(String dir) {
            File file = new File(dir);
            File[] fs = file.listFiles();
            Arrays.sort(fs, (File f1, File f2) -> {
                long diff = f1.lastModified() - f2.lastModified();
                if (diff > 0) {
                    return 1;
                } else if (diff == 0) {
                    return 0;
                } else {
                    return -1;
                }
            });
            for (int i = fs.length - 1; i >= 0; i--) {
                System.out.println(fs[i].getName() + ":" + new Date(fs[i].lastModified()));
            }
        }
    
        public static void main(String[] args) {
            System.out.println("Sort by size:");
            sortBySize("/Users/X");
            System.out.println();
    
            System.out.println("Sort by name:");
            sortByName("/Users/X");
            System.out.println();
    
            System.out.println("Sort by date:");
            sortByDate("/Users/X");
            System.out.println();
        }
    }