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Principios Básicos de Java
course content

Contenido del Curso

Principios Básicos de Java

Principios Básicos de Java

1. Iniciando
Desarrollo BackendRol de Java en el BackendVentajas de JavaTipos de Memoria en JavaSintaxis de JavaTu Primer ProgramaComentarios
2. Tipos Básicos, Operaciones
Tipos de Datos PrimitivosDesafíoTabla de Caracteres y ASCIIOperaciones Matemáticas en JavaSentencia If-ElseSentencia Switch-CaseNew Task StructureDesafío
3. Loops
Introducción A Los LoopsLoop WhileLoop Do-WhileChallenge: Building a Server Retry MechanismLoop ForIncremento Y DecrementoLoop Infinito (bonus)Desafío: Factorial
4. Arrays
¿Qué es Array?Usando Loops con ArraysIndex Out Of BoundsArray BidimensionalIteración en una Array BidimensionalLoop For-Each
5. String
¿Qué Es String?Métodos Básicos En String Parte 1Métodos Básicos en String Parte 2DesafíoNullPointer ExceptionStringBuilderConjunto de Strings, Método Equals()Resumen

book
¿Qué Es 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

copy

              
1

            
String name = "string";

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

java

Main

copy

              
12345678910

            
package com.example;

public class Main {
    public static void main(String[] args) {
        // Initializing a String variable
        String hello = "Hello world!"; 
        // Printing the String variable
        System.out.println(hello);
    }
}

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

copy

              
123456789101112

            
package com.example;

public class Main {
    public static void main(String[] args) {
        // Initializing a String variable
        String hello = "Hello world!"; 
        // Changing the reference to a new object in heap memory
        hello = "Hello c<>definity";        
        // Printing the updated String variable
        System.out.println(hello);
    }
}

We can also create arrays of strings:

java

Main

copy

              
12345678910

            
package com.example;

public class Main {
    public static void main(String[] args) {
        String[] array = {"Hello", ", ", "c<>definity"};
        for (String element : array) {
            System.out.print(element);
        }
    }
}

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.

The image illustrates how the string "Codefinity" is broken down into characters with their corresponding indices. Indexing starts at zero, where C is at index 0, and the last character, y, is at index 9.

This structure makes it easy for developers to work with individual characters in a string using methods from the String class, which we will explore in the next chapter.

1. Will the following code compile?

2. Will the following code compile?

question mark

Will the following code compile?

Select the correct answer

question mark

Will the following code compile?

Select the correct answer

¿Todo estuvo claro?

¿Cómo podemos mejorarlo?

¡Gracias por tus comentarios!

Sección 5. Capítulo 1

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course content

Contenido del Curso

Principios Básicos de Java

Principios Básicos de Java

1. Iniciando
Desarrollo BackendRol de Java en el BackendVentajas de JavaTipos de Memoria en JavaSintaxis de JavaTu Primer ProgramaComentarios
2. Tipos Básicos, Operaciones
Tipos de Datos PrimitivosDesafíoTabla de Caracteres y ASCIIOperaciones Matemáticas en JavaSentencia If-ElseSentencia Switch-CaseNew Task StructureDesafío
3. Loops
Introducción A Los LoopsLoop WhileLoop Do-WhileChallenge: Building a Server Retry MechanismLoop ForIncremento Y DecrementoLoop Infinito (bonus)Desafío: Factorial
4. Arrays
¿Qué es Array?Usando Loops con ArraysIndex Out Of BoundsArray BidimensionalIteración en una Array BidimensionalLoop For-Each
5. String
¿Qué Es String?Métodos Básicos En String Parte 1Métodos Básicos en String Parte 2DesafíoNullPointer ExceptionStringBuilderConjunto de Strings, Método Equals()Resumen

book
¿Qué Es 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

copy

              
1

            
String name = "string";

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

java

Main

copy

              
12345678910

            
package com.example;

public class Main {
    public static void main(String[] args) {
        // Initializing a String variable
        String hello = "Hello world!"; 
        // Printing the String variable
        System.out.println(hello);
    }
}

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

copy

              
123456789101112

            
package com.example;

public class Main {
    public static void main(String[] args) {
        // Initializing a String variable
        String hello = "Hello world!"; 
        // Changing the reference to a new object in heap memory
        hello = "Hello c<>definity";        
        // Printing the updated String variable
        System.out.println(hello);
    }
}

We can also create arrays of strings:

java

Main

copy

              
12345678910

            
package com.example;

public class Main {
    public static void main(String[] args) {
        String[] array = {"Hello", ", ", "c<>definity"};
        for (String element : array) {
            System.out.print(element);
        }
    }
}

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.

The image illustrates how the string "Codefinity" is broken down into characters with their corresponding indices. Indexing starts at zero, where C is at index 0, and the last character, y, is at index 9.

This structure makes it easy for developers to work with individual characters in a string using methods from the String class, which we will explore in the next chapter.

1. Will the following code compile?

2. Will the following code compile?

question mark

Will the following code compile?

Select the correct answer

question mark

Will the following code compile?

Select the correct answer

¿Todo estuvo claro?

¿Cómo podemos mejorarlo?

¡Gracias por tus comentarios!

Sección 5. Capítulo 1
Lamentamos que algo salió mal. ¿Qué pasó?
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