Scalaは（便利な）オブジェクト指向言語です ref: http://qiita.com/kmizu/items/cfaabdbfe3d3b4ef0640

file0.scala

class Point(val x: Int, val y: Int)
val p = new Point(1, 2)
println(p.x) // => 1
println(p.y) // => 2

file1.scala

class Point(val x: Int, val y: Int)

file10.scala

case class Person(name: String, age: Int)

file11.scala

val x: Int => Int = {x => x}

file12.scala

val x: Function1[Int, Int] = new Function1[Int, Int] {
  def apply(x: Int): Int = x
}

file13.scala

"""
Hoge
Foo
Bar
"""

file14.scala

implicit class RichString(self: String) {
  def show(): Unit = println(self)
}
"Hello, World!".show() // => "Hello, World!"

file2.scala

val p = new Point(1, 2)
p.x _ // => () => Int
p.y _ // => () => Int

file3.scala

def add(x: Int, y: Int): Int = {
  def a(x: Int, y: Int): Int = x + y
  a(x, y)
}

file4.scala

def f(arg1: Type1 ...): ReturnType = Expression

file5.scala

def f(x: Int, y: Int): Int = {
  x + y
}

file6.scala

def f(x: Int, y: Int): Int = x + y

file7.scala

scala> import scala.collection.mutable.Buffer
import scala.collection.mutable.Buffer

scala> val buffer = Buffer[Int]()
buffer: scala.collection.mutable.Buffer[Int] = ArrayBuffer()

scala> buffer += 1
res1: buffer.type = ArrayBuffer(1)

scala> buffer += 2
res2: buffer.type = ArrayBuffer(1, 2)

scala> buffer += 4
res3: buffer.type = ArrayBuffer(1, 2, 4)

file8.scala

scala> buffer.toList
res4: List[Int] = List(1, 2, 4)

file9.java

class Person {
  private final String name;
  private final int age;
  public Person(String name, int age) {
    this.name = name;
    this.age = age;
  }
  public String getName() {
    return name;
  }
  public int getAge() {
    return age;
  }
  public int hashCode() { .... }
  public boolean equals(Object other) { ... }
}