3.1 下面是创建File对象的语句,错误的是( )
A: File f=new File("d:\\text.txt");
B: File f=new File("d: ");
C: File f=new File("d:","text.txt");
D: File f=new File("d:\text.txt");
A: File f=new File("d:\\text.txt");
B: File f=new File("d: ");
C: File f=new File("d:","text.txt");
D: File f=new File("d:\text.txt");
举一反三
- 对于存放在D盘的vb文件夹下的文件cj.dat，创建该文件的File类对象的语句，正确的是（）。 A: File f=new File("d:\\vb\\cj.dat"); B: File f=new File("d:/vb","cj.dat"); C: File f=new File("d:/vb/cj.dat"); D:File f=new File(" D: File f=new File("d:\\vb","cj.dat");
- 下列写法错误的是 A: File f = new File ("a.txt"); B: File f = new File ("d:\\a.txt"); C: FileInputStream fis = new FileInputStream (new File ("a.txt")); D: FileOutputStream fos = new FileOutputStream ( File ("."));
- 创建一个d盘aa文件夹下news.txt文件对象，以下正确的是 A: File file = new File("d:/aa"); B: File file = new File("d:/aa/news.txt"); C: File file = new File("d:/news.txt"); D: File file = new File("d:\aa\news.txt");
- 如有File f=new File("a.txt");则说明该File对象f一定是文件()
- 下列__________说法是正确的？I:File file = new File("input.txt");try (Scanner input = new Scanner(file)) { String line = input.nextLine();}II:try (File file = new File("input.txt"); Scanner input = new Scanner(file);) { String line = input.nextLine();}III:File file;try (file = new File("input.txt"); Scanner input = new Scanner(file);) { String line = input.nextLine();}IV:File file;Scanner input;try (file = new File("input.txt"); input = new Scanner(file);) { String line = input.nextLine();} A: I B: II C: III D: IV