java按文件大小、名称、日期排序方法

    //java按文件大小、名称、日期排序  
       
       
    //java按文件大小、名称、日期排序方法  
    import java.io.*;  
    import java.util.*;  
     public class FileOrder{  
    //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()));  
          }  
      }  
       public static void main(String args[]){  
          // orderByLength("c:/java");  
          // orderByName("c:/java");  
          orderByDate("c:/java");  
          }  
    }