键盘录入

　　顺序 package>import>class

package com.test;

import java.util.Scanner;

public class ScannerTest{
    public static viod main(String[] args){
        //先创建Scanner对象
        Scanner sc = new Scanner(System.in);
        
        //接收数据
        int a = sc.nextInt();
        
        //打印数据
        System.out.println(a);
    }
}