jerryme3/library-system-management

How jerryme3/library-system-management works

This is a Java CLI library-management application. The borrower enters through the console, signs up or signs in, then donates, borrows, returns, searches, or views books and their profile; repository classes persist those operations through JDBC to PostgreSQL. The sampled App excerpt shows orchestration and several repository calls, but omits portions of the workflows, so uncertain wiring is not shown. README-listed features without sampled implementation detail are retained as capabilities of the CLI, not given speculative subsystem links.

Main entry points: App.java Account workflows · DatabaseConnection.java JDBC connection · BookRepository.java Book repository · BorrowerRepository.java Borrower repository

Components 20

CLI workflows

Console application src/main/java/com/library/system/App.java
Account workflows src/main/java/com/library/system/App.java
Book workflows src/main/java/com/library/system/App.java
Catalog and search src/main/java/com/library/system/App.java
Profile workflows src/main/java/com/library/system/App.java

Library domain

Book src/main/java/com/library/system/models/Book.java
Borrower src/main/java/com/library/system/models/Borrower.java
Transaction src/main/java/com/library/system/models/Transaction.java

Persistence

Book repository src/main/java/com/library/system/repository/BookRepository.java
Borrower repository src/main/java/com/library/system/repository/BorrowerRepository.java
Transaction repository src/main/java/com/library/system/repository/TransactionRepository.java
JDBC connection src/main/java/com/library/system/dbconnection/DatabaseConnection.java

Validation and security

Input checks src/main/java/com/library/system/utilities/InputAuthenticator.java
Email validation src/main/java/com/library/system/services/EmailService.java
Name validation src/main/java/com/library/system/services/StringService.java
Password handling src/main/java/com/library/system/services/PasswordService.java
Password hashing src/main/java/com/library/system/utilities/PasswordHashing.java
ID generation src/main/java/com/library/system/utilities/IDGenerator.java

Other components

Borrower
PostgreSQL

Connections 22

Borrower → Console application: enters choices
Console application → Account workflows: dispatches
Console application → Book workflows: dispatches
Console application → Catalog and search: dispatches
Console application → Profile workflows: dispatches
Account workflows → Borrower repository: reads and writes
Account workflows → Password hashing: hashes and verifies
Account workflows → ID generation: generates IDs
Account workflows → Email validation: reports email errors
Account workflows → Password handling: reports password errors
Book workflows → Book repository: reads and writes
Book workflows → Transaction repository: reads and writes
Book workflows → ID generation: generates IDs
Catalog and search → Book repository: searches and reads
Profile workflows → Borrower repository: reads and updates
Profile workflows → Password hashing: hashes and verifies
Profile workflows → Password handling: reports password errors
Book repository → JDBC connection: opens connection
Borrower repository → JDBC connection: opens connection
Transaction repository → JDBC connection: opens connection
JDBC connection → PostgreSQL: connects to
Name validation → Input checks: checks characters

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Drawn by GitDiagram on September 23, 2026 from the repository's file tree, README and source files. Read as Markdown ·