nipafx

public class Address {

	private final String addressLine;  // never null
	private final String city;         // never null
	private final String postcode;     // optional, thus may be null

	// constructor ensures non-null fields really are non-null
	// optional field can just be stored directly, as null means optional
	public Address(String addressLine, String city, String postcode) {
		this.addressLine = Preconditions.chckNotNull(addressLine);

nipafx

public class Address {

	// look ma, no comments required

	private final String addressLine;
	private final String city;
	private Optional<String> postcode;

	// nobody has to look at these constructors to check which parameters are
	// allowed to be null because of course none are!

nipafx

public class Address {

	// look ma, no comments required

	private final String addressLine;
	private final String city;
	private final Optional<String> postcode;

	// nobody has to look at this constructor to check which parameters are
	// allowed to be null because of course none are!

nipafx

package org.codefx.lab.stream;

import java.util.Collection;
import java.util.Objects;
import java.util.Optional;
import java.util.function.BinaryOperator;
import java.util.function.Supplier;

/**
 * Finds a certain customer in a collection of customers.

nipafx

package org.codefx.lab.optional;

import java.text.MessageFormat;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;

public class MapGet {

	private final MapWithGetAsOptional<Integer, String> map = new HashMapWithGetAsOptional<>();

nipafx

Verifying that +nipa is my blockchain ID. https://onename.com/nipa

nipafx

Keybase proof

I hereby claim:

• I am nicolaiparlog on github.
• I am nipa (https://keybase.io/nipa) on keybase.
• I have a public key whose fingerprint is 0781 2183 AB52 C901 733B 4D0E CA3B AD2E 9CCC D509

To claim this, I am signing this object:

nipafx

public class CallingDifferentSuperMethods {

	private interface DefaultImplementing {
		default boolean implemented() {
			return true;
		}
		default boolean overridden() {
			return true;
		}
		default boolean reabstracted() {

nipafx

Mit Project Jigsaw und Java 9 wird die Plattform modular. Das soll Sicherheit, Performance und Skalierbarkeit verbessern.

Aber nicht nur das JDK selbst, sondern auch Bibliotheken und Anwendungen steht der Weg in die Modularisierung offen. Mit dem Verlassen des fragilen Class Path soll der JAR Hell entkommen und die Wartbarkeit großer Anwendungen deutlich verbessert werden.

Die Vorträge zeigen die wichtigsten Features von Project Jigsaw anhand des Beispiels der Modularisierung einer bestehenden Anwendung:

• Definition von Modulen und Modulgraphen
• Laufzeitverhalten bei der Verletzung von Modularisierungsregeln
• Integration von nicht-modularen 3rd-Party-Abhängigkeiten

nipafx

package org.codefx.lab.aliquot;

import com.google.common.collect.ImmutableSetMultimap;
import org.junit.Test;

import java.util.Collection;
import java.util.List;
import java.util.stream.IntStream;

import static java.lang.Math.sqrt;