先看解释: nextInt(): it only reads the int value, nextInt() places the cursor in the same line after reading the input. next(): read the input only till the space. It can't read two words separated by space. Also, next() places the cursor in the same lin…
原创 Java中Scanner类中的方法next()和nextLine()都是吸取输入台输入的字符,区别: next()不会吸取字符前/后的空格/Tab键,只吸取字符,开始吸取字符(字符前后不算)直到遇到空格/Tab键/回车截止吸取: nextLine()吸取字符前后的空格/Tab键,回车键截止. import java.util.Scanner; import java.util.Vector; public class Main{ public static void main(String…
1..sql语句 在数据库中,当我们查询语句时,会使用类似的语句: Select * from userinfo where userid='1' or 1; Select * from userinfo where username="jfl"; 2.问题 Java通常需要连接数据库(Mysql,Oracle等)进行操作,在查询语句块中经常会用到where子句,在这里我们需要注意引号问题. 3.实例 在java中,我们需要将where子句的关键词变成变量,例如userid,usern…