public static void main(String args[]) {

List<EmergencyContactInfo> contactList = new ArrayList<>();

People people = new People();

Person p;

Iterator<HashMap<String,Person>> it;

Integer ageToFilter;

String charToFilter;

// Load test data in. Really, I should do this from a file...

contactList.add(new EmergencyContactInfo("Mary Smith","213-555-1212","1234 Main Street, Anytown USA",2));

contactList.add(new EmergencyContactInfo("Paul Smith","414-555-1313","1235 Main Street, Anytown USA",1));

p = new Person("12345","John Smith","(001) 213-555-1212","1234 Main Street, Anytown USA",18,contactList);

people.addPersonToMap(p);

contactList.clear();

contactList.add(new EmergencyContactInfo("Jane Brown","213-555-1212","1234 Main Street, Anytown USA",2));

contactList.add(new EmergencyContactInfo("Richard Brown","414-555-1313","1235 Main Street, Anytown USA",1));

p = new Person("12346","George Brown","(001) 213-555-1212","1234 Main Street, Anytown USA",46,contactList);

people.addPersonToMap(p);

contactList.clear();

contactList.add(new EmergencyContactInfo("Joann Green","213-555-1212","1234 Main Street, Anytown USA",2));

contactList.add(new EmergencyContactInfo("Robert Green","414-555-1313","1235 Main Street, Anytown USA",1));

p = new Person("12347","Jerry Green","(001) 213-555-1212","1234 Main Street, Anytown USA",21,contactList);

people.addPersonToMap(p);

contactList.clear();

// We were doing iteration over a hashmap manually to do the filters, but now we're

// going to do the same thing, but using a stream.

// To start with, we've moved the BiPredicate functions fByAge and fByName to the People class

// rather than having them in the main driver program as it makes sense to put them there.

System.out.println("Filtering by age");

ageToFilter = 21;

people.getPersonMap() // Gives me back the people object HashMap

.entrySet() // Then it returns the entry set (The key,value pairs)

.stream() // Start the stream

.map(v->v.getValue()) // I only care about the Person object values.

// Filter by age using the filterbyAge bipredicate. A new list is returned

// containing only those list elements that meet the test.

.filter(v -> People.fByAge.test(v.getAge(),ageToFilter) == true)

// Print each element of the filtered list.

.forEach(v->System.out.println(v));

// Now we're going to iterate over the hashmap, using some of the provided filters.

// Same as the previous code, except we're filtering by name, rather than by age.

System.out.println("Filter by name");

charToFilter = "J";

people.getPersonMap()

.entrySet()

.stream()

.map(v->v.getValue())

.filter(v -> People.fByName.test(v.getName(),charToFilter) == true)

.forEach(v->System.out.println(v));

}