Detailed introduction to type conversion

1.parseInt() converts the String type into the int type. Such as String a= "123";int b = Integer .parseInt(a); In this way, b is equal to 123. 2. The ValueOf() method, for example, Integer.valueOf() converts the String type into the Integer type (note: it is the Integer type, not the int type. The int type is a simple type that represents a number, and the Integer type is a complex type of reference. ) such as: String a= "123"; Integer c =Integer.valueOf(a); //Integer type can use int Value method Convert to int type int b =c.intValue(); At this time, b is equal to 123 S

1. Detailed introduction to valueof()

Introduction: 1.parseInt() converts the String type into the int type. For example, String a= "123";int b = Integer.parseInt(a); then b is equal to 123. 2. The ValueOf() method, for example, Integer.valueOf() converts the String type into the Integer type (note: it is the Integer type, not the int type,...

2. The difference between valueOf, parseInt and toString in Java

##Introduction: 1.parseInt( ) is to convert the String type into the int type. For example, String a= 123; int b = Integer.parseInt(a); so b is equal to 123. 2. The ValueOf() method, for example, Integer.valueOf() is to convert the String type. Convert to Integer type (note: it is Integer type, not int type. Int type is a simple class that represents numbers

3. Convert int type to varchar in MySQL database Slow query problems caused by type

Introduction: In the past week, we have processed 2 problems due to the conversion of int to varchar. Unable to use index, causing slow query. CREATE TABLE `appstat_day_prototype_201305` (`day_key` date NOT NULL DEFAULT '1900-01-01',`appkey` varchar(20) NOT NULL DEFAULT '',`user_total` bigint(20 ) NOT NULL DEFAULT '0',`user_act

4. Introduction to the method of converting varchar type to int type in Mysql database

Introduction: In the previous article, I told you about the slow query caused by converting int to varchar in the MySQL database. This article will introduce to you the conversion of varchar in the Mysql database. Let’s take a look at the method of converting type to int type! MySQL provides us with two type conversion functions: CAST and CONVERT. How can we let go of the ready-made things? CAST() and CONVERT() functions can be used to obtain a type. value and generate another type

5. Sample code sharing of php implementing some small things

Introduction: 1. PHP reads sql server varchar field data, and the select result is incomplete. When Mssql_query() reads varchar type, it only takes 255 bytes of data by default. If the field exceeds In this range, use CONVERT(TEXT, table.comment) to convert the field type to TEXT.

6. JavaScriptSerializer implementation class

# #Introduction: Let me share with you the general helper class first. The first one is the class that converts Object into json sequence. There are many on the Internet, but after I tried it, most of them cannot be used or have various bugs. In fact, There is a good class in C# that can solve this problem. It is the JavaScriptSerializer class. With this class, you can convert your object type into json and output it to the front desk with just a few lines of code!

7. In-depth understanding of endianness and type conversion in C/C++

Introduction: Endianness is related to the CPU type, so pay special attention when operating memory; Type conversion has nothing to do with endianness, it is only related to the type of data read out

8. Data Type PHP Section 2 Data Type Numeric Type

Introduction: Data Type: Data Type PHP Section 2 Data Type Numeric Type: PHP Supports 8 basic data types. Four scalar types: boolean (boolean) integer (integer) float (floating point type, also called double) string (string) two composite types: array (array) object (object) and finally two special types ：resource　（Resource） NULL　 (NULL) boolean data type: The value can only be True or False. When other types are converted to boolean types,

9. A brief discussion Convert other types in PHP to Bool type, a brief discussion on bool_PHP tutorial

Introduction: A brief discussion on other types in PHP The type is converted to Bool type, let’s talk about bool briefly. A brief discussion on the conversion of other types in PHP into Bool type, a brief discussion on bool. The origin of the problem: Will if(true==2) in PHP return true or false? The result is true. Following this question, I converted other data classes in PHP

10. Changes in converting other types in PHP into Bool types

Introduction: Changes in conversion of other types into Bool types in PHP

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