學生管理系統（HashSet實現和資料庫實現）

主函式：

public

class
testone
}static
void
menu()
set.
add(student)
;				system.out.
println
(set.
size()
);system.out.
println
("新增成功");
break;}
case2:
system.out.
println
("沒有找到該學號的學生資訊,刪除失敗！！！");
break;}
case3:
for(student stu : set)
}break;}
case4:
for(student stu : set)
}break;}
default
:				system.out.
println
("i'm sorry,there is not the "
+option+
" option,please try again.");
}}}

public

class
student
public
void
setid
(string id)
public string getname()
public
void
setname
(string name)
public string getmobile()
public
void
setmobile
(string mobile)
public string getaddress()
public
void
setaddress
(string address)
@override
public
inthashcode()
@override
public
boolean
equals
(object obj)
return
false;}
@override
public string tostring()
}

public

class
main
}static
void
menu()
system.out.
println
("請輸入學生姓名:");
string name = scanner.
next()
;				system.out.
println()
;				string mobile = scanner.
next()
;				system.out.
println()
;				string address = scanner.
next()
;				string sql1 =
"insert into student (id,name,mobile,address) values ('"
+ id +
"','"
+ name +
"','"
+ mobile +
"','"
+address+
"')";if
(db.
update
(sql1)
)					system.out.
println
("學生資訊新增成功！！");
else
system.out.
println
("新增失敗!!!");
break;}
case2:
else
break;}
case3:
system.out.
println
("請輸入修改的學生姓名:");
string name = scanner.
next()
;				system.out.
println()
;				string mobile = scanner.
next()
;				system.out.
println()
;				string address = scanner.
next()
;				string sql =
"update student set name = '"
+name+
"',mobile = '"
+mobile+
"',address = '"
+address+
"'where id = '"
+id+
"'";
if(db.
update
(sql)
)else
break;}
case4:
new()}
catch
(sqlexception e)}}
;				db.
select
;break;}
default
:				system.out.
println
("i'm sorry,there is not the "
+option+
" option,please try again.");
}}}

public

class
dblink
catch
(exception e)
return null;
}public
boolean
update
(string sql)
catch
(exception e)
finally
return
false;}
public
void
select
catch
(exception e)
finally
}public
boolean
exist
(string sql)
catch
(exception e)
finally
return
false;}
//方法的過載
private
void
close
(resultset resultset,statement statement,connection connection)
catch
(sqlexception e)
close
(statement,connection);}
private
void
close
(statement statement,connection connection)
catch
(sqlexception e)
trycatch
(sqlexception e)
}}

public

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