Leo code (169 Ergebnisse)

Zustand: New.

Zustand: As New. Unread book in perfect condition.

Zustand: New.

Paperback. Zustand: New.

Zustand: As New. Unread book in perfect condition.

Zustand: As New. Unread book in perfect condition.

Zustand: New.

Zustand: As New. Unread book in perfect condition.

Zustand: New.

Paperback. Zustand: New.

Zustand: As New. Unread book in perfect condition.

Zustand: New.

Zustand: New.

Zustand: As New. Unread book in perfect condition.

Paperback. Zustand: New.

Zustand: New.

Zustand: New.

Zustand: As New. Unread book in perfect condition.

Zustand: New.

Zustand: As New. Unread book in perfect condition.

Zustand: As New. Unread book in perfect condition.

Zustand: New.

Zustand: As New. Unread book in perfect condition.

Taschenbuch. Zustand: Neu. Neuware.

Taschenbuch. Zustand: Neu. Neuware.

Taschenbuch. Zustand: Neu. Neuware - Learning Java is not just about writing programs that work when everything goes right. It is also about knowing what to do when the user types the wrong thing, when a value does not make sense, when a file is missing, or when an operation can crash the program.100 Mini Java Exercises: Exceptions and Validation is Book 8 in the 100 Mini Java Exercises series, a practical collection designed to help you learn Java by writing code from the very first page.In this volume, you will work on one of the most important skills for moving beyond beginner code: building programs that are safer, more stable, and better prepared for real-world mistakes.Across 100 progressive exercises, you will practice try-catch, concrete exception types, number validation, safer input with Scanner, empty text checks, protected objects, safer file reading, CSV line validation, and stronger console menus.Each exercise includes a prompt, a clear goal, a complete Java solution, a step-by-step explanation, a note about validation or exceptions, and a possible improvement so you can keep practicing.This book is ideal for students, self-taught learners, future developers, and anyone who already knows the basics of Java and wants to write code that does not break so easily.You do not need frameworks, databases, graphical interfaces, or external libraries. You only need Java, a console, and the willingness to practice with clear, practical examples.In this book, you will learn how to: - Use try-catch to handle runtime errors.- Recognize exceptions such as ArithmeticException, NumberFormatException, InputMismatchException, IOException, and more.- Validate ages, grades, prices, percentages, and menu options.- Read user input more safely with Scanner.- Check empty strings, spaces, lengths, and basic text formats.- Protect objects with constructors, setters, and validation methods.- Read TXT and CSV files without blindly trusting their content.- Create console menus that stay stable when the user makes a mistake.- Build small final applications that combine validation, objects, lists, and files.If you want to move past fragile beginner programs and start writing safer Java code, this book will guide you one exercise at a time.Because a good programmer does not only know how to make a program work.A good programmer also knows how to prepare it for when something goes wrong.…

Taschenbuch. Zustand: Neu. Neuware.

Taschenbuch. Zustand: Neu. Neuware - Learn object-oriented programming in Java through 100 clear, practical, and progressive mini exercises.This fifth volume in the 100 Java Mini Exercises series is dedicated to one of the most important steps for anyone who wants to truly understand Java: classes, objects, attributes, constructors, encapsulation, and small object-oriented systems.If you already know variables, conditionals, loops, arrays, strings, and methods, this book will help you take the next step: stop writing programs with loose data and start organizing your code around real-world entities.Throughout the book, you will learn how to create classes such as: Person, Student, Product, Book, BankAccount, Employee, Customer, Order, Invoice, Reservation, Course, and many more.Each exercise is designed to help you understand one specific concept without unnecessary theory. You will begin by creating simple classes. Then you will add instance methods, constructors, private attributes, getters, setters, validations, the this keyword, objects inside other objects, and arrays of objects.The goal is to help you understand object-oriented programming step by step, with everyday examples and easy-to-follow Java code.In this book, you will learn how to: - create your own classes in Java;- create objects using new;- work with attributes and instance methods;- use constructors to initialize objects;- protect data with private;- use getters and setters;- validate data inside a class;- understand the this keyword;- create objects related to other objects;- work with arrays of objects;- build small object-oriented console systems.This is not a heavy theory book. It is a hands-on practice book.Each exercise includes a statement, a goal, a complete Java solution, a step-by-step explanation, an object-oriented programming note, and a possible improvement.If you want to understand OOP in Java without getting lost in complicated explanations, this book will guide you from your first class to your first small object-oriented systems.100 Java Mini Exercises: Object-Oriented Programming is the ideal volume to strengthen your Java learning and prepare for the next step: working with collections and dynamic lists such as ArrayList and HashMap. …

Taschenbuch. Zustand: Neu. Neuware - ¿Quieres aprender SQL desde cero sin perderte entre tecnicismos Este libro es la primera parte de una serie de tres libros pensada para acompañarte paso a paso en el aprendizaje de SQL, las bases de datos y el trabajo práctico con datos reales.SQL desde Cero para Gente Real está escrito para principiantes absolutos. No necesitas saber programar, ni tener experiencia previa con bases de datos, ni dominar conceptos técnicos complicados. Solo necesitas ganas de aprender una habilidad cada vez más útil en empresas, administración, análisis de datos, Excel, Python, Power BI y proyectos personales.A lo largo de este primer libro aprenderás qué es una base de datos, cómo se organizan las tablas, qué son las filas y columnas, cómo se hacen consultas sencillas y cómo empezar a filtrar, ordenar y analizar información con SQL.El enfoque es claro: menos teoría difícil y más ejemplos prácticos.Trabajarás con situaciones reconocibles: una tienda con productos y clientes, pedidos, ventas, alumnos, libros, gastos domésticos y pequeños registros de información. Antes de cada consulta verás la pregunta en lenguaje normal. Después escribirás el código SQL. Y luego entenderás cada línea con explicaciones sencillas.En este libro aprenderás, entre otras cosas: - Qué es SQL y por qué sigue siendo tan importante.- Cómo funciona una base de datos explicada con ejemplos cotidianos.- Qué son las tablas, filas, columnas y registros.- Cómo escribir tus primeras consultas con SELECT.- Cómo filtrar información con WHERE.- Cómo ordenar resultados con ORDER BY.- Cómo limitar resultados y evitar repetidos.- Cómo empezar a pensar en los datos de forma clara y ordenada.- Cómo practicar SQL sin miedo a equivocarte.Esta primera parte no pretende convertirte en experto de golpe. Su objetivo es mucho más importante: darte una base sólida, comprensible y práctica para que puedas avanzar con seguridad hacia los siguientes libros de la serie.Si vienes de Excel, de la administración, de una pequeña empresa, de estudios de informática, de oposiciones o simplemente quieres mejorar tu perfil profesional, este libro puede ser tu primer paso.SQL no es solo código. Es una forma de hacer preguntas a los datos.Y este libro te enseña a empezar.…

Paperback. Zustand: new. Paperback. Stop writing Python that merely works. Start writing Python that holds up.You already know the syntax. You can write a function, loop through a list, and define a class without stopping to think about it. And yet something still separates your code from the code you admire - the kind that is short, obvious, and still easy to change six months from now.That gap is exactly what this book closes.Python Intermediate Essentials is the first volume of the Python Intermediate in Practice series: ten books, fifteen exercises each, built as a progressive training program rather than a reference manual. Every exercise starts from a realistic problem, walks you through the design decisions before a single line of code is written, and ends with a challenge that forces you to apply what you just learned.Inside, you'll work through: Advanced unpacking that turns messy records into named, readable valuesSorting with explicit, reproducible criteria - including the tie-breakers most tutorials skipdefaultdict, ChainMap, Counter, deque, and namedtuple, and when each one is genuinely the right toolSets as a modeling language for permissions, overlaps, and exclusionsComprehensions that stay readable instead of collapsing into cryptic one-linersGuard clauses, conditional expressions, and the walrus operator used with judgmentStructural pattern matching with match / caseEnum, IntEnum, and StrEnum for states and constants that can't silently driftDataclasses that validate, compute, and sort using frozen, order, field, and post_initCustom exceptions, chaining, and preserving the real context of an errorShallow versus deep copies, sentinel values, and who actually owns a mutable objectA capstone project that combines all of it into a complete scoring and rules engineNo frameworks. No third-party packages. Just the Python standard library, your editor, and fifteen workshops that make you a more deliberate programmer.Whether you're self-taught, changing careers, or a working developer who wants to tighten the fundamentals, this series meets you where you are and raises the bar one exercise at a time.Pick up Book 1 today, and start writing Python you'll be glad to come back to. This item is printed on demand. Shipping may be from multiple locations in the US or from the UK, depending on stock availability.…