【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

package Scanner;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class TestScanner {
    public static void main(String[] args) throws FileNotFoundException {
        /*
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入一个整数：");
        int i = scanner.nextInt();
        System.out.println(i);
        */

        /*
        System.out.println("请输入日期：");//正则匹配
        if (scanner.hasNext("\d{4}-\d{2}-\d{2}"))
            System.out.println(scanner.next());
        else
            System.out.println("输入的不是日期时间。");
        scanner.close();
        */
        
        Scanner scan=new Scanner(new FileInputStream(new File("D:"+File.separator+"test.txt")));
        scan.useDelimiter("
");
        while(scan.hasNext())
            System.out.println(scan.next());
        scan.close();
    }
}