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Java Fundamentals

Java Fundamentals

By : Gazihan Alankus , Rogério Theodoro de Brito , Basheer Ahamed Fazal , Isola, Miles Obare
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Java Fundamentals

Java Fundamentals

1 (1)
By: Gazihan Alankus , Rogério Theodoro de Brito , Basheer Ahamed Fazal , Isola, Miles Obare

Overview of this book

Since its inception, Java has stormed the programming world. Its features and functionalities provide developers with the tools needed to write robust cross-platform applications. Java Fundamentals introduces you to these tools and functionalities that will enable you to create Java programs. The book begins with an introduction to the language, its philosophy, and evolution over time, until the latest release. You'll learn how the javac/java tools work and what Java packages are - the way a Java program is usually organized. Once you are comfortable with this, you'll be introduced to advanced concepts of the language, such as control flow keywords. You'll explore object-oriented programming and the part it plays in making Java what it is. In the concluding chapters, you'll get to grips with classes, typecasting, and interfaces, and understand the use of data structures, arrays, strings, handling exceptions, and creating generics. By the end of this book, you will have learned to write programs, automate tasks, and follow advanced courses on algorithms and data structures or explore more advanced Java courses.
Table of Contents (12 chapters)
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Java Fundamentals
Preface

Lesson 7: The Java Collections Framework and Generics


Activity 27: Read Users from CSV Using Array with Initial Capacity

Solution:

  1. Create a class called UseInitialCapacity with a main() method

    public class UseInitialCapacity {
      public static final void main (String [] args) throws Exception {
      }
    }
  2. Add a constant field that will be the initial capacity of the array. It will also be used when the array needs to grow:

    private static final int INITIAL_CAPACITY = 5;
  3. Add a static method that will resize arrays. It receives two parameters: an array of Users and an int that represents the new size for the array. It should also return an array of Users. Implement the resize algorithm using System.arraycopy like you did in the previous exercise. Be mindful that the new size might be smaller than the current size of the passed in array:

    private static User[] resizeArray(User[] users, int newCapacity) {
      User[] newUsers = new User[newCapacity];
      int lengthToCopy = newCapacity > users.length ? users...
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Java Fundamentals
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