Java I/O - 如何将文件属性更改为可写

 

 
import java.io.File;

public class Main {
  public static void main(String[] args) throws Exception {
    File file = new File("Writable.txt");
    file.createNewFile();
    file.setReadOnly();

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