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Java Basics

What Is String? What Is String?

String and How to Use It

In Java, a "String" is a data type used to represent text. Its syntax looks like this:

java

Main.java

You've already encountered a "String" when you displayed something on the screen using double quotation marks (""). Yes, "String" is among us. A string can also be output like any other variable, for example:

java

Main.java

It looks simple. Well, let's move on to the challenging part then. A string is a data type that cannot be changed after initialization. This is called an immutable class. Don't get stuck on these intimidating words right now; we will discuss them in a separate course. We can directly modify the value of an already initialized string variable, but in doing so, we simply create a new object in memory. For example:

java

Main.java

We can also create arrays of strings:

java

Main.java

In the next chapter, we will delve into the fundamental methods for working with strings, and you will come to understand why I mentioned that the value of a string variable cannot be altered without specific operations.

1. Will the following code compile?
2. Can we create an array of ``String`` data type?

Will the following code compile?

Select the correct answer

Can we create an array of String data type?

Select the correct answer

Everything was clear?

Section 5. Chapter 1
course content

Course Content

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 Table (bonus)Mathematical 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

Java Basics

What Is String? What Is String?

String and How to Use It

In Java, a "String" is a data type used to represent text. Its syntax looks like this:

java

Main.java

You've already encountered a "String" when you displayed something on the screen using double quotation marks (""). Yes, "String" is among us. A string can also be output like any other variable, for example:

java

Main.java

It looks simple. Well, let's move on to the challenging part then. A string is a data type that cannot be changed after initialization. This is called an immutable class. Don't get stuck on these intimidating words right now; we will discuss them in a separate course. We can directly modify the value of an already initialized string variable, but in doing so, we simply create a new object in memory. For example:

java

Main.java

We can also create arrays of strings:

java

Main.java

In the next chapter, we will delve into the fundamental methods for working with strings, and you will come to understand why I mentioned that the value of a string variable cannot be altered without specific operations.

1. Will the following code compile?
2. Can we create an array of ``String`` data type?

Will the following code compile?

Select the correct answer

Can we create an array of String data type?

Select the correct answer

Everything was clear?

Section 5. Chapter 1
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