Experiments about by-name parameter in Scala

ByNameParams.scala

class ByNameParams {
  private def multiply(x: => Int) : Int = x * 2
  def hello {
    multiply(100)
  }
}

javap_ByNameParams$$anonfun$hello$1.txt

>javap -c ByNameParams$$anonfun$hello$1
Compiled from "ByNameParams.scala"
//This class is generated by scalac
public final class ByNameParams$$anonfun$hello$1 extends scala.runtime.AbstractFunction0$mcI$sp implements java.io.Serializable{
public static final long serialVersionUID;

public static {};
  Code:
   0:   lconst_0
   1:   putstatic       #11; //Field serialVersionUID:J
   4:   return

public final int apply();
  Code:
   0:   aload_0
   1:   invokevirtual   #17; //Method apply$mcI$sp:()I
   4:   ireturn

public int apply$mcI$sp();
  Code:
   0:   ldc     #18; //int 100
   2:   ireturn

public final java.lang.Object apply();
  Code:
   0:   aload_0
   1:   invokevirtual   #21; //Method apply:()I
   4:   invokestatic    #27; //Method scala/runtime/BoxesRunTime.boxToInteger:(I)Ljava/lang/Integer;
   7:   areturn

// The constructor of the anonymous function
public ByNameParams$$anonfun$hello$1(ByNameParams);
  Code:
   0:   aload_0
   1:   invokespecial   #33; //Method scala/runtime/AbstractFunction0$mcI$sp."<init>":()V
   4:   return

}

javap_ByNameParams.txt

>javap -c ByNameParams
Compiled from "ByNameParams.scala"
public class ByNameParams extends java.lang.Object implements scala.ScalaObject{
public void hello();
  Code:
   0:   aload_0                                                                                      
   1:   new     #23; //class                                           // Create anonymous function object generated by compiler.
   4:   dup                                                                                         //
   5:   aload_0                                                                                     // 
   6:   invokespecial   #27; //Method ByNameParams$$anonfun$hello$1."<init>":(LByNameParams;)V      // Invoke the constructor of the anonymous function generated by scalac.
   9:   invokespecial   #31; //Method multiply:(Lscala/Function0;)I
   12:  pop
   13:  return

public ByNameParams();
  Code:
   0:   aload_0
   1:   invokespecial   #35; //Method java/lang/Object."<init>":()V
   4:   return

}