java Scanner类

Scanner demo = new Scanner(System.in);

/*
   *
   * 从控制台输入
   *
 **/
import java.util.Scanner;
public class Scannertest {
    public static void main(String[] args) {
        Scanner scr = new Scanner(System.in);
        System.out.println("请输入你的姓名：");
        String name = scr.next();
        System.out.println("请输入你的年龄：");
        int age = scr.nextInt();
        System.out.println("你的名字是："+name);
        System.out.println("你的年龄是："+age);
    }
}