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CHAPTERTWO

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Various Variable Types in Java

Java supports several types of variables, categorized mainly into primitive types and reference types.

Integer Variable (int)

for declaring numbers

Floating-point Variable (double)

for declaring decimal values

Character Variable (char)

for declaring single characters

java variables




Various Variable Types in Java Java supports several types of variables, categorized mainly into primitive types and reference types. Primitive types include basic data types like int for integers, double for floating-point numbers, char for single characters, boolean for true/false values, and others like byte, short, long, and float. These types store values directly. Reference types, on the other hand, refer to objects or arrays in memory and include classes, interfaces, and arrays. For instance, String is a reference type used to store sequences of characters. Variables in Java are also categorized by their scope and lifetime, including local variables (declared within methods), instance variables (associated with an object), and class variables (static variables associated with the class itself). Understanding these different types and how to use them effectively is key to mastering Java programming.


Integer Variable (int) 

public class VariableExamples {

public static void main(String[] args) {

  // Declare an integer variable

  int age = 25;
            

  // Output the value of the variable

  System.out.println("Age: " + age);

}

}
Output:

Age: 25





Floating-point Variable (double) 




public class VariableExamples {

  public static void main(String[] args) {

    // Declare a double variable for decimals

    double price = 19.99;
                

    // Output the value of the variable

    System.out.println("Price: " + price);

  }

}
Output:

Pice: 19.99





Character Variable (char)




public class VariableExamples {

  public static void main(String[] args) {

    // Declare a char variable for a single character

    char grade = 'A';
                

    // Output the value of the variable

    System.out.println("Grade: " + grade);

  }

}
Output:

Grade: A





Boolean Variable (boolean)



public class VariableExamples {

  public static void main(String[] args) {

    // Declare a boolean variable

    boolean isJavaFun = true;
                

    // Output the value of the variable

    System.out.println("Is Java fun? " + isJavaFun);

    // After this we obtain an output of true

  }

}
Output:

Is Java fun? 1





Reference Data Types



public class VariableExamples {

public static void main(String[] args) {

// Declare a String variable

String greeting = "Hello, World!";
                
// Output the value of the variable

System.out.println(greeting);
}

 }
Output:

Is Java fun? 1





Object Variable (Reference Type)



                  public class VariableExamples {
                    public static void main(String[] args) {
                        // Declare an object variable
                        Person person = new Person("Alice", 30);
                
                        // Output object properties
                        System.out.println("Name: " + person.getName());
                        System.out.println("Age: " + person.getAge());
                    }
                }
                
                class Person {
                    String name;
                    int age;
                
                    // Constructor to initialize the Person object
                    public Person(String name, int age) {
                        this.name = name;
                        this.age = age;
                    }
                
                    // Getter methods for name and age
                    public String getName() {
                        return name;
                    }
                
                    public int getAge() {
                        return age;
                    }
                }
Output:

Name: Alice

Age: 30

TESTIMONIES

vildash network team has had alot of impact on others but here are the vildash network team testimonies and expirience while working with the team

favour

am a graphic designer for vildash. when i first join vildash my first dream was programing but i got to know that programing neeeds alot of patients and coding but now my dream is more on the front end so i design graphics and make amazing ui/ux design. vildash is and amazing and great team

MR BK

when i first joined vildash my first vision was that i wanted to upgrade my skills and i really wanted to take a longer time but with vildash i got to know the fastest way in other to be perfect in programing and building amazing projects with ease

MR ENGEBEL

i was nothing in programing and i was discouraged cause i discovered that all programers had laptops but i didnt have and i got discouragecd cause, i thought i didnt evn have that chance to be a programer because of that but when i join vildash i got to know that its not just about the laptop its about the determination and if i have the determination i can archive. and i got to start programing with just my android phone and just like that am gradually getting there

MR LEWIS

vildash network has given me a chance to become a programmer, i now do thinks i didnt know i would be able to do, i now know tyhat i dont have to get distracted i need to stay focused and archive my goals

MR BROSKII

am a good programmer and i didnt have a team but i never knew how working with a team fills like but vildash network has given me the best expirience of how that feel, now i can boast of working with a team and the best team. it feels really greate cause with vildashi have to know that i can use my skills to do more than i dreamed of.

Events

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