Chapter 2: Data Types, Variables, and Operators
Java is essential for data management through variables and data types, providing a foundation for programming. It includes primitive and non-primitive data types, as well as operators that manipulate data effectively. Understanding type casting and operators is crucial for controlling data flow and ensuring accurate calculations.
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Sections
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2.4.1A. Primitive Data Types
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2.7.5E. Unary Operators
What we have learnt
- Variables store data; each must have a declared data type.
- Java has primitive types (int, char, etc.) and non-primitive types (String, arrays).
- Type casting helps convert between types when needed.
- Use final to declare constants.
- Java provides rich operators to manipulate data.
- Operator precedence helps determine how expressions are evaluated.
Key Concepts
- -- Variables
- Containers used to store data which are declared with a specific data type.
- -- Data Types
- Classes of data that tell the compiler how to interpret the data, encompassing both primitive and non-primitive types.
- -- Type Casting
- The conversion of one data type to another, including implicit (widening) and explicit (narrowing) casting.
- -- Operators
- Symbols used to perform operations on variables and values, including arithmetic, relational, logical, and assignment operators.
- -- Constants
- Values that do not change during the execution of a program, declared using the final keyword.
- -- Operator Precedence
- The hierarchy that determines the order in which operators are evaluated in an expression.
Additional Learning Materials
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