In a previous tutorial, we explored the concept of variables. Now, let’s delve into the realm of java global variables to gain a deeper understanding of their significance and usage
Java Global Variables :
Welcome to our tutorial on Java global variables! In this guide, we’ll explore the significance and usage of global variables in Java programming. Unlike local variables, global variables offer broader accessibility across the entire program, enhancing flexibility and reusability. Let’s dive into the intricacies of declaring and utilizing global variables in Java for a more robust and versatile coding experience.
When we declare and assign a value to a variable locally in a program, its scope is limited to that specific section. Reusing the same variable name elsewhere becomes impossible due to naming conflicts.
To overcome this limitation, we turn to global variables. By declaring them globally, at the outset of the program and after the class declaration, we ensure their accessibility throughout the entire program, facilitating seamless utilization across various sections of the code.
public class variables {
// Global variables declaration
public static void main(String args[]) {
// Local variables declaration
}
}
Generally we declare a local variable as
int a;
with value assigned
int a = 5;
Now declare global variables as
public static int a;
with value assigned
public static int a = 5;
Here public is access specifier and static is used for constant variable.
So will see a small example of global declaration
1) int:
Exploring integers in Java! Declaring a global int variable, like ‘number,’ enables its use throughout the program, adding flexibility and reusability to the code. Let’s dive into the world of Java integers
public class variables {
public static int a = 5;
public static void main(String args[]) {
// integer
System.out.println(a);
}
}
Now we can override the value assigned to int a and re assign value of a
a = 3;
public class variables {
public static int a = 5;
public static void main(String args[]) {
// integer
a = 3;
System.out.println(a);
}
}
2) String:
Similar to declaring an integer, we can declare a global String variable, let’s say ‘abc,’ and leverage its accessibility throughout our program. This allows us to use the String variable across different sections of our code for enhanced flexibility and reusability.
public static String abc = "welcome";
public static void main(String args[]) {
// String
System.out.println(abc);
}
3) float:
In Java programming, the float data type allows the declaration of global variables, such as ‘value,’ enabling widespread use throughout the program. Explore the flexibility and versatility that float brings to numeric representations in Java
public static float value = 10.15f;
public static void main(String args[]) {
// float
System.out.println(value);
}
4) boolean:
Boolean in Java is like a switch. It can either be ‘true’ or ‘false.’ It’s perfect for making decisions in your program. For example, you can use it to check if something is on or off, yes or no, or any two opposite conditions.
public static boolean exam = true;
public static void main(String args[]) {
// boolean
if (exam==true)
System.out.println("pass");
else
System.out.println("fail");
}
5) char:
Char in Java is short for ‘character.’ It’s a single letter, number, or symbol. You can use char to store and work with individual characters in your program. It’s handy when dealing with letters of the alphabet, numbers, or special symbols.
public static char text = 'a';
public static void main(String args[]) {
// char
System.out.println(text);
}
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