scala会为每个字段生成getter和setter方法

《疯狂Java讲义(第3版)》.(李刚).[PDF].pdf

第一步：

bogon:~ ycf$ more Person.scala 

class Person(name:String){

var age = 0; 

}

bogon:~ ycf$ scalac Person.scala 

bogon:~ ycf$ javap -private Person 

Compiled from "Person.scala"

public class Person {

  private int age;

  public int age();

  public void age_$eq(int);

  public Person(java.lang.String);

}

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 第二步 case class和class的结果对比：自动实现序列化，比较，hashCode,toString等常规方法

bogon:~ ycf$ more Person.scala 

case class Person(name:String){

var age = 0; 

}

bogon:~ ycf$ 

bogon:~ ycf$ scalac Person.scala 

bogon:~ ycf$ javap -private Person 

Compiled from "Person.scala"

public class Person implements scala.Product,scala.Serializable {

  private final java.lang.String name;

  private int age;

  public static <A> scala.Function1<java.lang.String, A> andThen(scala.Function1<Person, A>);

  public static <A> scala.Function1<A, Person> compose(scala.Function1<A, java.lang.String>);

  public java.lang.String name();

  public int age();

  public void age_$eq(int);

  public Person copy(java.lang.String);

  public java.lang.String copy$default$1();

  public java.lang.String productPrefix();

  public int productArity();

  public java.lang.Object productElement(int);

  public scala.collection.Iterator<java.lang.Object> productIterator();

  public boolean canEqual(java.lang.Object);

  public int hashCode();

  public java.lang.String toString();

  public boolean equals(java.lang.Object);

  public Person(java.lang.String);

}