java如何删除文件？

Question

我使用以下代码删除文本文件。但它不会删除仍然存在的文件

File delfile=new File("SDS_DID.txt");
delfile.delete();

如何删除文件

Answer 1

1. 尝试使用文件的绝对路径
2. 确保您对该文件具有写入权限
3. 档案。delete（）返回一个布尔值，表示是否成功。检查这个值

Answer 2

最常见的问题是找不到文件。 确保文件已经存在

String fileName = "SDS_DID.txt";
// A File object to represent the filename
File f = new File(fileName);
if (!f.exists) {
JOptionPane.showErrorDialog (null , filename + " is not found.");
}

你不能只在硬盘上的任何地方拿起一个文件，你必须知道它实际上在哪里

Answer 3

System.gc(); // close any streams first

  String fileName = "SDS_DID.txt";
// A File object to represent the filename
File f = new File(fileName);

// Make sure the file or directory exists and isn't write protected
if (!f.exists())
  throw new IllegalArgumentException(
      "Delete: no such file or directory: " + fileName);

if (!f.canWrite())
  throw new IllegalArgumentException("Delete: write protected: "
      + fileName);


// Attempt to delete it
boolean success = f.delete();

if (!success)
  throw new IllegalArgumentException("Delete: deletion failed");