对Java File类的操作-- delete

对Java File类的操作-- delete

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执行File.delete()时最好做一系列的验证。

import  java.io.File;
public   class  Delete {
     public  Delete() {
         //  TODO Auto-generated constructor stub
    }
     /**
     *  @param  args
      */
     public   static   void  main(String[] args) {
         if (args.length  !=   1 ){
            System.err.println( " Usage:java Delete<file or directory> " );
            System.exit( 0 );
        }
        
         try {
            delet1e(args[ 0 ]);
        } catch (IllegalArgumentException e){
            System.err.println(e.getMessage());
        }
    }
     private   static   void  delet1e(String fileName) {
        File f  =   new  File(fileName);
         if ( ! f.exists())
            fail( " Delete:no such file or firectory: "   +  fileName);
         if ( ! f.canWrite())
            fail( " Delete:write protected : "   +  fileName);
         if (f.isDirectory()){
            String[] files  =  f.list();
             if (files.length  >   0 )
                fail( " Delete:directory not empty: "   +  fileName);
        }
         boolean  success  =  f.delete();
         if ( ! success)
            fail( " Delete: delete failed " );
    }
     private   static   void  fail(String msg) throws  IllegalArgumentException {
         //  TODO Auto-generated method stub
         throw   new  IllegalArgumentException(msg);
    }
}

Kyle Wang