What applications is the static modifier suitable for?

1. Class variables (static fields): For storing data common to all instances of the class. For example, a counter of created objects or constants.
2. Class methods (static methods): For performing actions that do not depend on a specific instance of the class. For example, helper functions or methods for working with static fields.
3. Static initialization blocks: For performing complex initialization of static fields when the class is loaded.
4. Nested static classes: For logical grouping of related classes or for use as helper classes without a reference to an external object.

Examples:

public class MyClass {
    // Static field (constant)
    public static final int MAX_COUNT = 100;

    // Static field (instance counter)
    private static int instanceCount = 0;

    // Static initialization block
    static {
        System.out.println("MyClass loaded.");
    }

    public MyClass() {
        instanceCount++;
    }

    // Static method
    public static int getInstanceCount() {
        return instanceCount;
    }

    // Nested static class
    public static class StaticInnerClass {
        public void doSomething() {
            System.out.println("In static inner class.");
        }
    }
}

Comparison table of static and non-static members:

Attribute	Static member	Non-static member
Object association	Belongs to the class	Belongs to an instance
Access	Via class name or object	Via object
Initialization	When the class is loaded	When the object is created
Memory	Allocated once	Allocated for each object