What is the role and usage of anonymous objects in programming?

Anonymous objects in programming are objects that are created without being assigned to a variable. They are often used when the object is needed only once, for example, to pass a parameter or call a method.

In Android and Java, this is commonly seen when creating listeners or callbacks:

button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // handle click
    }
});

Here, an anonymous object of the class View.OnClickListener is created without a separate name. This is convenient when the class is used only in one place and does not require reuse.

Advantages:

• Reduces code length
• Localizes logic
• Convenient for implementing interfaces with a single method (especially with lambdas)

Disadvantages:

• Can complicate code readability when large in volume
• Harder to reuse

In modern versions of Java and Kotlin, lambda expressions are often used instead of anonymous classes for conciseness.