file.listFiles()按文件大小、名称、日期排序方法

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按照文件大小排序

public static void orderByLength(String fliePath) { List< File> files = Arrays.asList(new File(fliePath).listFiles()); Collections.sort(files, new Comparator< File>() {     public int compare(File f1, File f2) {long diff = f1.length() - f2.length();if (diff > 0)  return 1;else if (diff == 0)  return 0;else  return -1;     }    public boolean equals(Object obj) {return true;    }   });   for (File f : files) {      if(f.isDirectory()) continue;      System.out.println(f.getName()+":"+f.length());   }}
按照文件名称排序
public static void orderByName(String fliePath) {  List files = Arrays.asList(new File(fliePath).listFiles());  Collections.sort(files, new Comparator< File>() {   @Override   public int compare(File o1, File o2) {if (o1.isDirectory() && o2.isFile())          return -1;if (o1.isFile() && o2.isDirectory())          return 1;return o1.getName().compareTo(o2.getName());   }  });   for (File f : files) {     System.out.println(f.getName());    }  }
按日期排序
public static void orderByDate(String fliePath) {   File file = new File(fliePath);   File[] fs = file.listFiles();   Arrays.sort(fs,new Comparator< File>(){     public int compare(File f1, File f2) {long diff = f1.lastModified() - f2.lastModified();if (diff > 0)  return 1;else if (diff == 0)  return 0;else  return -1;     }     public boolean equals(Object obj) {return true;     }     });     for (int i = fs.length-1; i >-1; i--) {System.out.println(fs[i].getName());System.out.println(new Date(fs[i].lastModified()));      }  }

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