Scala for Java Developers by 2014

Author:2014
Language: eng
Format: mobi, epub
Publisher: Packt Publishing

Notice the underscore (_) representing a default value when declaring var id: Int = _. The default value will be set according to the type T of a variable, as defined by the Scala specification:

0 if T is Int or one of its subrange types

0L if T is Long

0.0f if T is Float

0.0d if T is Double

false if T is Boolean

() if T is Unit

null for all other types of T

The Language entity corresponds to the addition of a new concept we want to persist and therefore requires a new database table, as follows:

@Entity @Table(name = "language") class Language(l: String) { @Id @GeneratedValue(strategy = GenerationType.AUTO) @Column(name = "ID") @BeanProperty var id: Int = _ @BeanProperty @Column(name = "NAME") var name: String = l def this() = this (null) override def toString = id + " = " + name }

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