How Do I Declare and Use Global Variables (Class Variables) in Java?

Declaring Global Variables in Java

In Java, global variables, also known as class variables, are shared attributes accessible from any part of the program belonging to the same class. To define such variables, developers employ the static keyword.

For instance:

public class Example {
    public static int a;
    public static int b;
}

In this example, a and b are global variables. They can be accessed using the syntax:

Example.a;

Example.b;

When defining global variables, it's crucial to consider thread safety. Unlike local variables, global variables are stored in the method area, shared by all threads, which can lead to concurrency issues if not handled appropriately. Consequently, global variables should only be used when necessary and with measures in place to prevent conflicts.

The above is the detailed content of How Do I Declare and Use Global Variables (Class Variables) in Java?. For more information, please follow other related articles on the PHP Chinese website!