Describe the concept of method references in Java 8.
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Method references in Java 8 are a shorthand notation of a lambda expression to call a method. They are used to refer directly to a method without executing it. By using method references, you can point to methods by their names and pass them as arguments to other methods or constructors.
There are four types of method references:
Reference to a Static Method: For example, ClassName::staticMethodName
Reference to an Instance Method of a Particular Object: For example, instance::instanceMethodName
Reference to an Instance Method of an Arbitrary Object of a Particular Type: For example, ClassName::instanceMethodName
Reference to a Constructor: For example, ClassName::new
Method references help to make your code more concise and readable, especially when the lambda expression is simply invoking an existing method.