val和var和Java

 object Hello
   {
           def main(args :Array[String])
           {
                   var i = 1
                   val k = i
           }
   
  
}

jvm代码

public final class Hello$ {
  public static Hello$ MODULE$;

  public static {};
    Code:
       0: new           #2                  // class Hello$
       3: invokespecial #12                 // Method "<init>":()V
       6: return

  public void main(java.lang.String[]);
    Code:
       0: iconst_1      
       1: istore_2      
       2: iload_2
       3: istore_3
       4: return
}

-------Java

  public class Hello2
   {
   
     public static void main(String args[])
     {
           int i = 1;
           int k = i;
     }
   
  }

public class Hello2 {
  public Hello2();
    Code:
       0: aload_0
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: return

  public static void main(java.lang.String[]);
    Code:
       0: iconst_1
       1: istore_1
       2: iload_1
       3: istore_2
       4: return
}