JavaIO File路径问题

public class Demo2 {
	public static void main(String[] args) {
		/*
		File file = new File("F:"+File.separator+"a.txt");
		System.out.println("存在吗："+ file.exists());
		System.out.println("目录分隔符："+ File.separator);
		*/
		File file2 = new File("."); 
		System.out.println("当前路径："+file2.getAbsolutePath());
		File file = new File("..\\a.txt");
		System.out.println("存在吗："+ file.exists());
	}
}