// 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 outputmsg -> System.out.println(msg)// Takes a String parameter and returns its length(String str) -> str.length()

package corejava2.lambda;@FunctionalInterfacepublic interface Adder {    double add(double n1, double n2);}

package corejava2.lambda;@FunctionalInterfacepublic 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);    }}