// Takes an int parameter and returns the parameter value incremented by 1

(int x) -> x + 1

// Takes two int parameters and returns their sum

(int x, int y) -> x + y

// Takes two int parameters and returns the maximum of the two

(int x, int y) -> {

    int max = x > y ? x : y;

    return max;

}

// Takes no parameters and returns void

() -> { }

// Takes no parameters and returns a string "OK"

() -> "OK"

// Takes a String parameter and prints it on the standard output

(String msg) -> { System.out.println(msg); }

// Takes a parameter and prints it on the standard output

msg -> System.out.println(msg)

// Takes a String parameter and returns its length

(String str) -> str.length()

package corejava2.lambda;

@FunctionalInterface

public interface Adder {

    double add(double n1, double n2);

}

package corejava2.lambda;

@FunctionalInterface

public interface Joiner {

    String join(String s1, String s2);

}

package corejava2.lambda;

public class TargetTypeTest {

    public static void main(String[] args) {

        // Creates an Adder using a lambda expression

        Adder adder = (x, y) -> x + y;

        // Creates a Joiner using a lambda expression

        Joiner joiner = (x, y) -> x + y;

        // Adds two doubles

        double sum1 = adder.add(10.34, 89.11);

        // Adds two ints

        double sum2 = adder.add(10, 89);

        // Joins two strings

        String str = joiner.join("Hello", " lambda");

        System.out.println("sum1 = " + sum1);

        System.out.println("sum2 = " + sum2);

        System.out.println("str = " + str);

    }

}