Java Fundamentals
Course
Module 3
Variables & Datatypes
in Java
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Datatypes and Variables in Java, Cheat Sheet of Java Programming
This PowerPoint covers the core concepts of data types and variables in Java programming. It's ideal for a beginner Java course or as a reference guide. The presentation includes: Primitive data types (byte, short, int, long, float, double, boolean, char) Differences between primitive and reference types Variable declaration syntax in Java Scope of variables (class, local, instance) Type casting and conversion in Java Arrays and ArrayLists as reference types Examples declaring variables of different data types Assigning values to variables Manipulating variable values through operations
Typology: Cheat Sheet
2022/2023
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Java Fundamentals
Course
Module 3
Variables & Datatypes
in Java
Introduction
● (^) Java is a strongly typed language, meaning variables must be declared with a specific type before they can be used ● (^) Variables contain data that can be used in a Java program ● (^) There are 8 primitive data types in Java: byte, short, int, long, float, double, char, Boolean.
Primitive Data Types
● (^) Byte - 8 bit integer (-128 to 127) ● (^) Short - 16 bit integer (-32,768 to 32,767) ● (^) Int - 32 bit integer (-2,147,483,648 to 2,147,483,647) ● (^) Long - 64 bit integer ● (^) Float - 32 bit floating point ● (^) Double - 64 bit floating point ● (^) Char - 16 bit Unicode character ● (^) Boolean - true or false
Conclusion
● (^) Java is a strongly typed language with 8 primitive data types ● (^) Variables must be declared before use with a specific type ● (^) The final keyword can be used to create constants ● (^) Choosing the right data type for a variable is important for efficiency and accuracy