# 搬移檔案 move

public class Test {
	public static void main(String[] args) {
		Path source = Paths.get("C:\\Users\\A7024\\git-sideProject\\exam.ocpjp\\green.txt");
		Path target = Paths.get("C:\\Users\\A7024\\git-sideProject\\exam.ocpjp\\colors\\yellow.txt");
		try {
			Files.move(source, target, StandardCopyOption.ATOMIC_MOVE);
			Files.delete(source);
		} catch (IOException e) {
			e.printStackTrace();
		}		
	}
}

Console:

java.nio.file.NoSuchFileException: C:\Users\A7024\git-sideProject\exam.ocpjp\green.txt
	at sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:79)
	at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:97)
	at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:102)
	at sun.nio.fs.WindowsFileSystemProvider.implDelete(WindowsFileSystemProvider.java:269)
	at sun.nio.fs.AbstractFileSystemProvider.delete(AbstractFileSystemProvider.java:103)
	at java.nio.file.Files.delete(Files.java:1126)
	at exam.ocpjp.v1.q089.Test.main(Test.java:16)

Which statement is true?
A. The green.txt file content is replaced by the yellow.txt file content and the yellow.txt file is
deleted.
**B. The yellow.txt file content is replaced by the green.txt file content and an exception is thrown.**
C. The file green.txt is moved to the /colors directory.
D. A FileAlreadyExistsException is thrown at runtime.
- [x] **Answer: B**

:::info
程式第6行，會將「/green.txt」移動到「/colors/yellow.txt」，原先的「/colors/yellow.txt」會被覆蓋，而「/green.txt」會被刪除。這裡使用了StandardCopyOption.ATOMIC_MOVE這個CopyOption，會將移動檔案的動作變成是atomic的，也就是在這個過程中並不會被其他的執行緒介入(像是搶奪檔案的寫入權限)，。

所以green.txt 裡面的內容 會被複製到 yellow.txt裡面
然後green.txt會被刪除

:::

###### tags: `ocpjp`