Flow control, variable types
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This document discusses data types and flow control in Java. It covers the main data type categories of primitives and objects. Primitives are simple values that can be assigned literals, while objects are more complex and can contain other variables and functions. The 8 primitive types - char, short, int, long, float, double, boolean, byte - are described along with their allowed values. Objects include over 4000 predefined types as well as custom types a programmer can define. Arrays, enums, and interfaces are also covered as subtype categories. Flow control structures like if/else, switch, while, do/while, and for loops are listed, and functional style flow control available since Java 8 is briefly mentioned. Demo code is provided
![Data Types
●Arrays: a “holder” for a number of instances of a
type
– int[]
– String[]
●It also has methods and properties](https://image.slidesharecdn.com/iapdcbnfte2wnbb6dvkz-signature-ea2b793b9c129ad824bf6fee7c1946e73da48e3e19459f8386165b741bf26fc9-poli-181031194758/85/Flow-control-variable-types-10-320.jpg)
Flow control, variable types
- 1. @AbrahamMarin Data types and flow control Abraham Marin-Perez ●Java Programmer for about 10 years ●Also C#, PHP and some Ruby ●Public speaker ●Author
- 3. Data Types
- 4. Data Types ●Largely, two groups: – Primitives – Objects
- 5. Data Types ●Primitives: simple entities, can be assigned with literals ●Objects: complex entities, can hold variables (primitives or other objects) and have functions
- 6. Data Types ●Primitives: 8 of them – char – short – int – long – float – double – boolean – byte
- 7. Data Types ●Primitives: 8 of them – char (16-bit Unicode) – short (32767) – int (231-1) – long (263-1) – float (32-bit) – double (64-bit) – boolean (true, false) – byte (127)
- 8. Data Types ●Objects: 4000+ ●And you can define your own!
- 9. Data Types ●Three more subtypes: – Arrays – Enums – Interfaces
- 10. Data Types ●Arrays: a “holder” for a number of instances of a type – int[] – String[] ●It also has methods and properties
- 11. Data Types ●Enums: enumerations, only a predefined list of values are valid Enum Colour { RED, BLUE, GREEN } Colour colour = Colour.GREEN;
- 12. Data Types ●Interfaces: a “template” for other types
- 13. Data Types ●Primitives: the same individual value cannot be shared, a copy is made on assignment ●Objects: multiple references to the same value are possible, the same value is shared on assignment
- 14. Data Types DEMO
- 15. Flow Control ●The usual suspects: – if … else – switch – while – do … while – for – for (iterable version)
- 17. Flow Control - Functional Style ●Available since Java 8
- 18. Flow Control - Functional Style DEMO
- 19. @AbrahamMarin