import java.util.Scanner;
public class Mailbox {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("输入QQ邮箱:");
String qqMail = sc.next();
int index = qqMail.indexOf('@');
String qqNum = qqMail.substring(0, index);
System.out.println("这个邮箱对应的qq:" + qqNum + "。");
sc.close();
}
}
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