if嵌套结构

判断男女：

import java.util.*;

public class Test{

       public static void main(String[] args){

              Scanner in=new Scanner(System.in);

              System.out.println("请输入你的性别?(男/女)");

              String  sex=in.next();

              if(sex.equals("男")){

                     System.out.println("你的年纪是多少？");

                     int age=in.nextInt();

                     if(age>18){

                            System.out.println("恭喜成年了");

                     }else{

                            System.out.println("还未成年");}           

              }

              else{ 

                     System.out.println("原来是个女孩");

              }

       }

}