MethodReferenceExample1.java

import java.util.Arrays;

/**
 * Demonstration of bound method references.
 */
public class MethodReferenceExample1 {
    public static void main(String[] args) {
        Arrays.stream(args, 1, args.length).filter(args[0]::contains)
                .forEach(System.out::println);
    }
}

MethodReferenceExample2.java

import java.math.BigDecimal;
import java.util.Arrays;

/**
 * Demonstration of constructor and unbound method references.
 */
public class MethodReferenceExample2 {
    public static void main(String[] args) {
        System.out.println(Arrays.stream(args).map(BigDecimal::new)
                .reduce(BigDecimal.ZERO, BigDecimal::add));
    }
}

MethodReferenceExample3.java

import java.util.Arrays;

/**
 * Demonstration of static method references, and a simple lambda.
 */
public class MethodReferenceExample3 {
    public static void main(String[] args) {
        System.out.println(Math.sqrt(Arrays.stream(args)
                .mapToDouble(Double::parseDouble).map(x -> x * x).sum()));
    }
}