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Method references

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Table of Contents

• Method references
  • Table of Contents
  • Examples
  • Ref.

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Shorthand syntax for referring to an existing method by its name. They provide a concise way to pass a method as an argument or to assign a method to a functional interface.

Method references can be seen as a more compact alternative to lambda expressions when the lambda expression simply calls an existing method without any additional logic.

The syntax for method references in Java is as follows:

ClassName::methodName

There are several types of method references in Java:

Reference to a static method:

ClassName::staticMethodName

Reference to an instance method of a particular object:

instance::instanceMethodName

Reference to an instance method of an arbitrary object of a particular type:

ClassName::instanceMethodName

Reference to a constructor:

ClassName::new

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Examples

Capitalizing and printing a list of Strings:

   List<String> messages = Arrays.asList("hello", "baeldung", "readers!");

We can achieve this by leveraging a simple lambda expression calling the StringUtils.capitalize() method directly:

   messages.forEach(word -> StringUtils.capitalize(word));

Or, we can use a method reference to simply refer to the capitalize static method:

   messages.forEach(StringUtils::capitalize);

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Ref.

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Get Started | Languages | Java Development | Java 8 | PF in Java

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