how to mask sensitive data in java

1. Built-in data typeThe Java language provides eight basic types. Six types of numbers (four integers, two floating-point types), one character type, and one Boolean type.Byte The byte data type is a 8-bit, signed, integer in binary complement notation; The minimum value is -128 ( -2^7); The maximum value is 127 (2^7-1); The default value is

1.Java variables1.1 Concepts of variables A storage area in memory; The region has its own name (variable name) and type (data type); The data of the region can be changed continuously within the same type; 1.1.1 Why you need to define variables Used for constant storage of the same type of constant and can be reused; 1.1.2 Def

(Getjson method is not possible to post the way submitted). If you want to send a large amount of data across the domain to use the Ajax method provided by jquery, it is best not to choose the Getjson method. 4. The above examples are based on the premise that you are in control of both aspects of development. Also note that the server program side of the safety factor is not high (recommended data recei

Today just class, Yang teacher said the conversion between the system: 16 binary: 1,2,3,4,5,6,7,8,9,a,b,c,d,e,f. Already mastered, just a stroke!decimal integers, such as: 99,-500, 0octal integers, which require starting with 0, such as: 0 15Hexadecimal number, requires 0x or 0X, such as: 0x 15Java is a strongly typed language with a naming convention for identifiers:Can only be a letter, _, number, $ composition, and the first digit cannot be a number! Can not use keywords, strict case-

,user_name,user_age) values (?,?,?)" ;PreparedStatementppst= Conn.preparestatement (SQL); ppst.setint (1,1); ppst.setstring (2, "Tomas"); ppst.setint (3,10); ppst.execute (); }publIcvoiddeletedata () throwsException{ stringsql= "DELETENBSP;FROMNBSP;EDU_USERNBSP;WHERENBSP;USER_IDNBSP;=NBSP;?" ;PreparedStatementppst= Conn.preparestatement (SQL); ppst.setint (1,1); ppst.execute ();} publicvoidupdatedata () throwsException{ Stringsql= "Updateedu_usersetuser_age=?,user_name =?whereuser_id=? " ;Prepar

Employee"; Query query = session.createquery (HQL); Query.setfirstresult (1); Query.setmaxresults (ten); List results = query.list (); Query criteriaHibernate provides an action object, followed by an alternate way of data available in the RDBMS table. One approach is the standard API, which allows you to create a standard query object program that can apply filtering rules and logical conditions.When the session interface for Hibernate provid

Introduce the data class configuration, which is mainly used for data classes that need to convert the database MySQL data into Java objects and then convert them to AS3 objects.The configuration file is in XML format.Objects> Objectname= "Tuservo"TableName= "V_user"Note= "comment"author= "Idoublewei"> Fieldn

1. VariablesComputers process data, variables are used to store processed data, which is called variables because you can change the stored values. Rather, a variable points to an address that stores a particular type of value, in other words, a variable has a name, type, and value. A variable has a name, such as radius, area, age, and height, and the name of each variable is unique, and this way we can set