Tell me about lambda expressions and method references in the context of Java programming and their application in Android development.

Lambda expressions are a concise notation for creating anonymous functions. They allow passing functionality as an argument to a method or creating a function without specifying its name. Syntax: (parameters) -> { body }. They are used to implement interfaces with a single abstract method (functional interfaces).

Application in Android:

• Event handlers (clicks, touch events).
• Implementation of listener interfaces (e.g., OnClickListener, OnCompleteListener).
• Working with Stream API for collection processing (filtering, transformation).

// Before Java 8
button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Toast.makeText(context, "Clicked!", Toast.LENGTH_SHORT).show();
    }
});

// Using lambda expression
button.setOnClickListener(v -> {
    Toast.makeText(context, "Clicked!", Toast.LENGTH_SHORT).show();
});

Method references are a more compact way to refer to existing methods or constructors without executing them. They are used to replace lambda expressions that simply call a single method.

Types of method references:

• Reference to a static method: Class::staticMethodName
• Reference to an instance method of an object: object::instanceMethodName
• Reference to an instance method of an arbitrary object of a particular type: Type::instanceMethodName
• Reference to a constructor: Class::new

Application in Android:

• Shortening lambda expressions when working with listeners.
• Using in Stream API to apply methods to stream elements.

// Lambda expression
List<String> names = Arrays.asList("Alice", "Bob");
names.forEach(name -> System.out.println(name));

// Method reference
names.forEach(System.out::println);

Advantages:

• Improved code readability, especially for simple operations.
• More concise code.
• Using in Stream API makes collection processing more functional and efficient.