Java™ How To Program (Early Objects), Tenth Edition

Section 17.2.2 Lambda Expressions

• A lambda expression (p. 733) represents an anonymous method—a shorthand notation for implementing a functional interface.

• The type of a lambda is the type of the functional interface that the lambda implements.

• Lambda expressions can be used anywhere functional interfaces are expected.

• A lambda consists of a parameter list followed by the arrow token (->, p. 733) and a body, as in:

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(parameterList) -> {statements}

For example, the following lambda receives two ints and returns their sum:

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(int x, int y) -> {return x + y;}

This lambda’s body is a statement block that may contain one or more statements enclosed in curly braces.

• A lambda’s parameter ...