1.实现类中属性带getter和setter方法

class Persion{
    var age=0
}
scalac Persion.scala
javap -private Persion
#----------------------------------
Compiled from "Person.scala"
public class Person {
  private int age;
  public int age();//getter
  public void age_$eq(int);//setter
  public Person();
}

2.实现类中属性只带getter

class Persion{
    val age=0
}
scalac Persion.scala
javap -private Persion
#-----------------------
Compiled from "Person.scala"
public class Person {
  private final int age;
  public int age();
  public Person();
}

3.实现类中属性不要getter和setter方法

class Persion{
    private[this] val age=0
}
scalac Persion.scala
javap -private Persion
#-----------------------
Compiled from "Person.scala"
public class Person {
  private final int age;
  public Person();
}
对象私有字段，scala根本不会生成getter和setter
class Persion{
    private[this] var age=0
}
scalac Persion.scala
javap -private Persion
#-----------------------
Compiled from "Person.scala"
public class Person {
  private final int age;
  public Person();
}


import scala.beans.BeanProperty
class Person{
  @BeanProperty var age = 0
}
scalac Persion.scala
javap -private Persion
#-----------------------
Compiled from "Person.scala"
public class Person {
  private int age;
  public int age();
  public void age_$eq(int);
  public void setAge(int);
  public int getAge();
  public Person();
}

2019年2月23 ，北京朝阳区京城大厦