Test1.java

package com.freemindcafe.java8.sample1;

import java.util.Optional;

import org.junit.Test;

public class Test1{
    
    @Test(expected=NullPointerException.class)
    public void should_throw_null_pointer_exception(){
        System.out.println(new Person().car.insurance.name);
    }
    
    @Test
    public void should_not_throw_null_pointer_exception(){
        //System.out.println(new Person().optionalCar.map((c) -> c.optionalInsurance).map((i) -> i.);
    }
    
}

class Person {
    Car car;
    Optional<Car> optionalCar;
}

class Car{
    Insurance insurance;
    Optional<Insurance> optionalInsurance;
}

class Insurance{
    String name;
}