Want to learn how to code? Master the foundations of Java, an in-demand programming language. Get hands-on with immersive exercises, interactive quizzes, and earn certifications to build in-demand skills.

java.tar.gz

Java

Java is a high-level, object-oriented language known for its portability and reliability. Mastering Java is key for developers to build scalable, secure software efficiently.

In this course, you will start by mastering the art of problem-solving with simple Java programs, such as the Bottle Filling example. You will learn how to structure your solutions, create execution sheets, and enhance your problem-solving abilities through practical exercises and quizzes. Progressing further, you will learn decision-making and branching in Java, understanding flowcharts, conditional expressions, and their application. You will also learn about Java basics, including the first Java program, fundamentals, conditional statements, and error categories, followed by in-depth lessons on working with Java strings and arrays. 

By the end of this course, you will have a solid understanding of Java programming fundamentals and the ability to solve real-world problems using Java.

Learn to Code: Java for Absolute Beginners



# Collection
A **collection** is a general term used to group multiple values into a single unit. We use collections all the time in the real world―a book is a collection of pages, a train is a collection of train cars, and a wardrobe is a collection of clothes. 



# String
A **string** is a collection of characters, mostly treated as a single unit. A string is used to store text values like a name, address, message, etc.

## Initializing the string
The following program demonstrates the initialization of a string: 



class Test
{
  public static void main(String[] args) 
  { 
    String string1 = "It is a string";
    System.out.println(string1);
  }
}

In **line 5**, we declare `string` using double quotes `""`.
## Accessing the characters in a string
Java allows us to access individual characters inside a string through an integer **index** number. To do this, we enclose the index number in square brackets after the string variable name, as shown in the following program:

Learn to access the individual elements of a string.


Inside the String


Learn to access the individual elements of a string.

About the Course

Problem Solving with Simple Programs

Decisions and Branching

Java Basics

Repetition with Loops

Strings and Arrays

Methods

Appendix - Complex Programs

Wrap Up

Inside the String

Collection

String

Initializing the string

Accessing the characters in a string