Concepts of CL - Part 2

Overview

Continuation from previous chapter on concepts of CL
Focus: Array of objects, object manipulation, reference passing, overloading, composite objects
Importance for Java projects
Topics: Basic arrays, arrays in classes, programming with arrays and classes

Declaring and initializing arrays
Example syntax for different types: int[], double[], String[]
Arrays use loops for initialization
Example usage of arrays in Java for input and storage: int[] array = new int[10]; for (int i = 0; i < 10; i++) { array[i] = i; }
Difference between square brackets and curly braces
- Square brackets: Specify length
- Curly braces: Initialize values

Accessing and displaying array elements
Using loops for efficient processing
Example of looping to initialize array elements: for (int i = 0; i < array.length; i++) { array[i] = i * 2; }
Loop variables as array indices

Using arrays with classes and methods
Example: Sales associate class
- User inputs number of associates
- Creating and storing multiple objects in an array

Arrays can store multiple objects of the same type
- Example: Student[] students = new Student[5];
Using loops to initialize object arrays for (int i = 0; i < students.length; i++) { students[i] = new Student(); }
Accessing and manipulating objects within arrays

Defining a class that includes another class as an attribute
Example: Course class contains array of Student objects
- Initialize objects and use them within another class
public class Course { private String courseName; private Student[] students; public Course(String name, int numberOfStudents) { this.courseName = name; this.students = new Student[numberOfStudents]; for (int i = 0; i < numberOfStudents; i++) { students[i] = new Student(); } } }