What scopes can be used in any application?

In Java, the following scopes can be used:

• Class (static): Variables and methods declared as static. They are associated with the class rather than an instance of the object. Accessible through the class name.
• Instance: Variables and methods that are not static. They are associated with a specific instance of the object. Accessible only after creating an object.
• Method (local): Variables declared inside a method, constructor, or initialization block. Accessible only within the block of code where they are declared.
• Block: Variables declared inside any block {}, such as in for, while loops, if, else statements. Accessible only within that block.

// Class scope (static)
public class ExampleClass {

    static int classVariable = 10; // Class (static) scope

    // Instance scope
    int instanceVariable = 20; // Instance scope

    public void exampleMethod() {
        // Method scope
        int methodVariable = 30; // Method scope

        if (true) {
            // Block scope
            int blockVariable = 40; // Block scope
            System.out.println(blockVariable); // Accessible
        }
        // System.out.println(blockVariable); // Not accessible here

        System.out.println(methodVariable); // Accessible
        System.out.println(instanceVariable); // Accessible
        System.out.println(classVariable); // Accessible
    }

    public static void main(String[] args) {
        System.out.println(classVariable); // Accessible directly through class name
        // System.out.println(instanceVariable); // Not accessible directly, needs an object
        // System.out.println(methodVariable); // Not accessible
        // System.out.println(blockVariable); // Not accessible

        ExampleClass obj = new ExampleClass();
        System.out.println(obj.instanceVariable); // Accessible through object
    }
}