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The syntax of lambda expressions in Java is as follows:
scssCopy code(parameters) -> expression or statement block
Here's a breakdown of the components:
Parameters:
( )
. If the lambda takes no parameters, you can leave the parentheses empty. If there is only one parameter, you can omit the parentheses. For multiple parameters, separate them with commas.() -> expression
(int x) -> expression
(int x, int y) -> expression
Arrow Operator:
->
separates the parameters from the body of the lambda expression.(x, y) -> expression
Expression or Statement Block:
{ }
.{ }
.return
statement explicitly to return a value.(x, y) -> x + y
(x, y) -> { int sum = x + y; return sum; }
Here are some more examples of lambda expressions with different syntax:
Lambda expression with no parameters and a single expression:
javaCopy code() -> "Hello, World!"
Lambda expression with one parameter and a single expression:
javaCopy code(String name) -> "Hello, " + name
Lambda expression with two parameters and a statement block:
javaCopy code(int a, int b) -> {
int sum = a + b;
return sum;
}
Lambda expression with no parameters and a statement block:
javaCopy code() -> {
System.out.println("This is a lambda expression.");
}
Lambda expression with a functional interface:
javaCopy codePredicate<Integer> isEven = (n) -> n % 2 == 0;
Lambda expressions are used to provide a concise implementation of functional interfaces and are widely used in Java 8 and later versions to simplify functional programming and functional-style operations on collections and streams.
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