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Java Basics
course content

Course Content

Java Basics

Java Basics

1. Getting Started
Backend DevelopmentRole of Java in the Backend Java Advantages Memory Types In Java Java's SyntaxYour First ProgramComments
2. Basic Types, Operations
Primitive Data TypesPrimitive Types ChallengeChar and ASCII TableMathematical Operations in JavaIf-Else StatementSwitch-Case StatementWeekday Switch Challenge
3. Loops
Introduction to LoopsWhile-LoopDo-While LoopFor-Loop Increment and DecrementInfinite Loop (bonus)Challenge: Factorial
4. Arrays
What is Array?Using Loops with ArraysIndex Out Of BoundsTwo-Dimentional ArrayIteration In Two-Dimensional ArrayFor-Each Loop
5. String
What Is String? Basic Methods In String Part 1Basic Methods In String Part 2B-Inclusion Filter ChallengeNullPointer Exception StringBuilderString Pool, Method Equals() Summary

bookChar and ASCII Table

Why Can We Perform Mathematical Operations on the char Data Type?

The char data type is quite interesting. It stores characters, but you can also perform operations on this data type.

What will be the result of executing this code?

java

Main

copy

              
1234567891011

            
package com.example;

public class Main {
    public static void main(String[] args) {
        char firstLetter = 'A';
        char secondLetter = '(';
        char result = (char) (firstLetter + secondLetter);
        //we use type casting here to convert value from int to char
        System.out.println(result);
    }
}

Note

Here, we use the "+" sign to concatenate two different variables. We will cover basic operations in the next chapter, but for now, you should know that "+" combines the values of two variables.

One might have thought that the result would be "A(", but as we can see, the result is "i". Why is that? char is not purely a character data type; it takes characters from the ASCII table. The character "A" corresponds to the number 65 in the table, while the character "(" corresponds to the number 40. As you may have guessed, the character "i" corresponds to 105, as 65 + 40 = 105. It's important to know this because it allows us to operate on the char data type excellently and flexibly.

Here is a link to the ASCII table.

Note:

Type casting in Java refers to the process of converting one data type to another. It allows us to treat a variable of one type as if it were another. When casting an int to a char, we can use the (char) syntax. This conversion is known as a narrowing primitive conversion because we convert from a larger range (32-bit integer) to a smaller range (16-bit Unicode character).

Why can we perform mathematical operations on char?

Why can we perform mathematical operations on char?

Select the correct answer

Everything was clear?

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Section 2. Chapter 3
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