1925: ArrayList class

define a student class including name,number,sex

define an arrayList to store students,and do some operations on it,like insertion,deletion, search and display

there are many cases,for each case,input n to denote the number of students,and then input n students;

input m to denote the times to operate on the arrayList,and then input m lines, for each line,input a letter,I or D

1)I,denoting an insertion,following by the insertion index and a student to insert

2)D,denoting a deletion,following by the deletion index

finally,output the content of the arrayList

2
zhangsan 20120866601 m
lishi 20120866603 f
4
I 2 wangwu 20120866604 m
I 0 lai 20120866605 f
D 2
I 1 erqu 20120866602 f

the information of 4 students is:
lai 20120866605 f
erqu 20120866602 f
zhangsan 20120866601 m
wangwu 20120866604 m