Java 只读文件

import java.io.File;
import java.io.IOException;

public class FileReadAttribute {
   public static void main(String[] args) throws IOException {
      File file = new File("c:/file.txt");
      file.setReadOnly();

      if(file.canWrite()) {
         System.out.println("This file is writable");
      } else {
         System.out.println("This file is read only");
      }
      file.setWritable(true);

      if(file.canWrite()) {
         System.out.println("This file is writable");
      } else {
         System.out.println("This file is read only");
      }
   }
}