Kohei Nozaki's blog 

int[] array = {1, 2, 3};

int[] array;
array = {2, 3, 4};

int[] array;
array = new int[]{2, 3, 4};

package corejava.classpath;

public class Main {
    public static void main(String[] args) {
        System.out.println(new corejava.jar1.Foo());
        System.out.println(new corejava.jar2.Bar());
    }
}

$ ls -l /tmp/jar
total 24
-rw-r--r--  1 kyle  wheel  2192 Jun 19 16:06 classpath-1.0-SNAPSHOT.jar
-rw-r--r--  1 kyle  wheel  1962 Jun 19 16:04 jar1-1.0-SNAPSHOT.jar
-rw-r--r--  1 kyle  wheel  1962 Jun 19 16:04 jar2-1.0-SNAPSHOT.jar

$ java -cp '/tmp/jar/*' corejava.classpath.Main
corejava.jar1.Foo@511d50c0
corejava.jar2.Bar@5e2de80c

$ java -cp '/tmp/jar/*.jar' corejava.classpath.Main
Error: Could not find or load main class corejava.classpath.Main

package corejava.main;

/**
 * The class represents a dog. <br> <img src="doc-files/chihuahua.jpg" alt="a cute chihuahua dog">
 */
public class Dog {

    /**
     * The dog will say woof.
     */
    public void bark() {
        System.out.println("Woof!");
    }
}

.
|-- java
|   `-- corejava
|       `-- main
|           `-- Dog.java
|-- javadoc
|   `-- corejava
|       `-- main
|           `-- doc-files
|               `-- chihuahua.jpg
`-- resources

package corejava.main;

/**
 * Represents a cat.
 */
public class Cat {

    /**
     * The cat starts meowing.
     *
     * @see corejava.main.Dog#bark()
     * */
    public void meow() {
        System.out.println("Meow!");
    }
}

Comparator<String> c1 = new Comparator<String>() {
    @Override
    public int compare(String x, String y) {
        return x.compareTo(y);
    }
};
Comparator<String> c2 = (x, y) -> x.compareTo(y);
Comparator<String> c3 = String::compareTo;

public class Dog {
    private String name;

    public Dog(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    @Override
    public String toString() {
        return "Dog{" + "name='" + name + '\'' + '}';
    }
}

List<String> dogs = Arrays.asList("Snoopy", "Spike", "Olaf");
Stream<Dog> dogStream = dogs.stream().map(Dog::new);

Dog[] dogArray = dogStream.toArray(Dog[]::new);