Package Architecture, package Declaration, and import Statements0%

Package Architecture, package Declaration, and import Statements

Intermediate12 min read•Updated: 2026-10-22

📦 Package Architecture and import Statements

Introduction

A package in Java organizes related classes, interfaces, and sub-packages into namespaces, preventing naming collisions and grouping business domain code.

🏛️ Directory Mapping & The Reverse-Domain Convention

In Java, package hierarchies map directly to physical directory paths on disk:

1Package Declaration: package in.mskinstitute.portal.admissions;
2Directory on Disk:   in/mskinstitute/portal/admissions/StudentRegistry.java

💻 Syntax & Importing

1// 1. Package declaration MUST be the first non-comment line
2package in.mskinstitute.courses;
3 
4// 2. Import specific class (Recommended):
5import java.util.ArrayList;
6import java.time.LocalDate;
7 
8// 3. Static import (Imports static members directly):
9import static java.lang.Math.PI;
10import static java.lang.Math.sqrt;
11 
12public class CourseSchedule {
13    public static void main(String[] args) {
14        ArrayList<String> batches = new ArrayList<>();
15        batches.add("Java Morning Batch");
16 
17        // Static import in action:
18        double area = PI * sqrt(25);
19        System.out.println("Computed: " + area);
20    }
21}

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Package Architecture, package Declaration, and import Statements

Intermediate12 min read•Updated: 2026-10-22

Study Materials

📦 Package Architecture and import Statements

Introduction

A package in Java organizes related classes, interfaces, and sub-packages into namespaces, preventing naming collisions and grouping business domain code.

🏛️ Directory Mapping & The Reverse-Domain Convention

In Java, package hierarchies map directly to physical directory paths on disk:

1Package Declaration: package in.mskinstitute.portal.admissions;
2Directory on Disk:   in/mskinstitute/portal/admissions/StudentRegistry.java

💻 Syntax & Importing

1// 1. Package declaration MUST be the first non-comment line
2package in.mskinstitute.courses;
3 
4// 2. Import specific class (Recommended):
5import java.util.ArrayList;
6import java.time.LocalDate;
7 
8// 3. Static import (Imports static members directly):
9import static java.lang.Math.PI;
10import static java.lang.Math.sqrt;
11 
12public class CourseSchedule {
13    public static void main(String[] args) {
14        ArrayList<String> batches = new ArrayList<>();
15        batches.add("Java Morning Batch");
16 
17        // Static import in action:
18        double area = PI * sqrt(25);
19        System.out.println("Computed: " + area);
20    }
21}

Next Lesson

Package Scope and Information Hiding

Continue learning with hands-on practice, examples, and exercises in the upcoming topic.

Related Lessons

Previous Lesson	Next Lesson
Interfaces: Declaration, Multiple Interface Implementation, and default/static Methods	Package Scope and Information Hiding

Practice Quiz

Test your understanding of this lesson with 1 questions. Each question has one correct answer.

Previous Next