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Create Global Variable in Java

Created: March-06, 2021 | Updated: March-24, 2021

1. Create Global Variable Using the static Keyword in Java
2. Create Global Variables by Using interfaces in Java
3. Create Global Variable Using static and concluding Keyword in Java

This tutorial introduces how to create a global variable in Java.

There is no concept of a global variable in Coffee. Nosotros cannot create global variables as nosotros do in other programming languages such every bit C or C++. However, nosotros can achieve this by using some existing concepts such every bit static and final static variables in class or the use of an interface where we can declare a variable as constant and use it as a global variable.

We employ a static variable to create a global variable considering the static variable is used to share common properties between objects and does not belong to whatever specific object. All the static variables belong to class only. Allow's see some examples.

Create Global Variable Using the static Keyword in Java

This is the simplest fashion to create a global variable in Java. We brand a class Employee containing two static variables, id and proper name, and nosotros call them within the other class SimpleTesting. Static variables tin can be accessed by using the form name. We don't need to create an object to telephone call static variables. See the example below.

              class Employee{     static int id;     static String proper noun; } public class SimpleTesting{     public static void main(String[] args) {          Employee.id = 125;         Employee.name = "Rohan";         int empId = Employee.id;         String name = Employee.proper noun;         Arrangement.out.println("Id: "+empId);         System.out.println("Name: "+name);     } }                          

Output:

              Value in double: 12.9 Value in int: 12                          

Create Global Variables by Using interfaces in Coffee

This is some other option that can be used to create a global variable in Coffee. Here, nosotros create an interface, GlobalVals containing two variables, id and name. All the variables of an interface are public static and terminal by default so that they can exist used as global variables.

Variables of an interface neither require object nor interface name to call. Nosotros need to implement the interface in a class and call the variable equally a local variable. See the instance below.

              interface GlobalVals{     int id = 1212;     String proper noun = "Samre" ; }  public class SimpleTesting implements GlobalVals{     public static void main(String[] args) {          int empId = id;         Cord empName = proper name;         Organisation.out.println("Id: "+empId);         System.out.println("Name: "+empName);     } }                          

Output:

              Id: 1212 Name: Samre                          

Create Global Variable Using static and final Keyword in Java

The concept of static and final variables is used to create a constant in Java. We tin can use this to create a global variable also. Nosotros create a class, GlobalVals that contains two static terminal variables, and in the SimpleTesting class, nosotros call them by uncomplicated class name. Come across the example below.

              class GlobalVals{     static final int ID = 1212;     static final Cord NAME = "Samre" ; }  public form SimpleTesting{     public static void chief(Cord[] args) {          int empId = GlobalVals.ID;         String empName = GlobalVals.Name;         Organization.out.println("Id: "+empId);         System.out.println("Name: "+empName);     } }                          

Output:

              Id: 1212 Proper noun: Samre                          

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