【java】扫描流Scanner接收输入示例

多用Scanner少用InputStream

多用BufferedReader少用Reader

多用PrintStream少用OutputStream

多用PrintWriter少用Writer

 1 package Scanner;
 2 
 3 import java.io.File;
 4 import java.io.FileInputStream;
 5 import java.io.FileNotFoundException;
 6 import java.util.Scanner;
 7 
 8 public class TestScanner {
 9     public static void main(String[] args) throws FileNotFoundException {
10         /*
11         Scanner scanner = new Scanner(System.in);
12         System.out.println("请输入一个整数：");
13         int i = scanner.nextInt();
14         System.out.println(i);
15         */
16 
17         /*
18         System.out.println("请输入日期：");//正则匹配
19         if (scanner.hasNext("\d{4}-\d{2}-\d{2}"))
20             System.out.println(scanner.next());
21         else
22             System.out.println("输入的不是日期时间。");
23         scanner.close();
24         */
25         
26         Scanner scan=new Scanner(new FileInputStream(new File("D:"+File.separator+"test.txt")));
27         scan.useDelimiter("
");
28         while(scan.hasNext())
29             System.out.println(scan.next());
30         scan.close();
31     }
32 }

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