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Sequence of Instructions
Java follows a structured execution order for arithmetic calculations and programming constructs. In this post, we explore key concepts such as variable reassignment, the final keyword, expressions, statements, blocks of code, and comments.
1. Reassigning Variables
In Java, variable values can be modified after initialization.
Example:
.jpg "Sequence of Instructions") |
| Reassigning Variables |
1
2
2. The final Keyword
The final keyword prevents modifications to variables, methods, and classes.
2.1 Final Variables :
A variable declared as final remains constant.
Example:
.jpg "Final Keyword") |
| Final keyword |
Output:
60
Attempting to modify a final variable results in an error.
3. Expressions
Expressions are combinations of values, variables, and operators.
3.1 Order of Operations (BODMAS)
The standard precedence follows:
- Brackets
- Orders (Exponents, Roots)
- Division
- Multiplication
- Addition
- Subtraction
Example:
.jpg "BODMAS") |
| Order of Operations |
Output:
4. Statements
A statement is a complete executable unit, ending with a semicolon (;).
Example:
.jpg "Statements") |
| Statements |
Output:
1
Omitting a semicolon results in a syntax error.
5. Blocks of Code
A block consists of multiple statements enclosed within {}.
Example:
.jpg "Blocks of Code") |
| Blocks of Code |
6. Comments
Comments enhance code readability and documentation.
6.1 Single-line Comments:
Start with // and apply to a single line.
// This is a single-line comment
int num = 15; // Assigning value
6.2 Multi-line Comments
Start with /* and end with */.
/*
Multi-line comments can span
across multiple lines.
*/
int num = 15;
Summary
- Variables in Java can be reassigned unless declared
final. finalvariables remain constant.- Expressions follow BODMAS rules.
- Statements must end with
;. - Blocks of code are enclosed within
{}. - Comments can be single-line (
//) or multi-line (/* */).
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