JAVA & amp; JSON details, download from the java Official Website

JAVA & JSON details, download from java Official Website
JSON Definition

JSON (JavaScript Object Notation) is a lightweight data exchange format. It is based on a subset of ECMAScript. JSON uses a completely language-independent text format, but it also uses a habit similar to the C language family (including C, C ++, C #, Java, JavaScript, Perl, Python, and so on ). These features make JSON an ideal data exchange language. Easy to read, write, and machine resolution and generation (network transmission rate ).

JSON usage

• Use JavaScript-based applications, including Browser Extensions and websites

• Serialized and structured data transmission network connections in JSON format

• This is mainly used for data transmission between servers and Web applications.

• Web services and APIs provide public data in JSON format

• It can be used with modern programming languages

JSON features

• Easy to read/write JSON

• Lightweight text-based interchange format

• Independent Language

JSON syntax rules JSON syntax is a subset of the JavaScript Object Representation syntax.

• Data in key-value pairs
• Data is separated by commas (,).
• Brackets save objects
• Square brackets Save the Array

JSON name/value pair the format of writing JSON data is: Name/value pair. Name/value pair combination names are written in front (in double quotation marks), value pairs are written in the back (also in double quotation marks), separated by colons:

{"firstName":"Brett","lastName":"McLaughlin","email":"aaaa"}

JSON format supports the following data types:

Type	Description
Number	Double Precision Floating Point format in JavaScript
String	Unicode escape by backslash in double quotation marks
Boolean	True or false
Array	Ordered sequence of Values
Value	It can be a string, a number, true or false (true/false), empty (null), etc.
Object	Unordered set key-value pairs
Whitespace	Any one-to-one token can be used.
Null	Empty

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