Assignemnt #38 and Space Boxing

Code

      ///Name: Dakota Donahue
      ///Period: 5
      ///Project Name: Space Boxing
      ///File Name: SpaceBoxing
      ///Date: 10/13/2015
      
      import java.util.Scanner;

      public class SpaceBoxing
      {
          public static void main ( String[] args )
          {
              
              Scanner keyboard = new Scanner(System.in);
              
              int planet;
              double weight;
              
              System.out.print( " Please enter your current earth weight: ");
              weight = keyboard.nextInt();
              
              System.out.println( " I have information for the following planets: " );
              System.out.println( " 1. Venus  2. Mars   3. Jupiter  " );
              System.out.println( " 4. Saturn  5. Uranus 6. Neptune" );
              
              System.out.print( " Which planet are you visiting? " );
              planet = keyboard.nextInt();
              
              String result = "";
      
      		if ( planet == 1 )
              {
                  weight = weight*0.78;
                  System.out.println( " Your weight would be " + weight + " on that planet. " );
              }
              else if ( planet == 2 )
              {
                  weight = weight*0.39;
                  System.out.println( " Your weight would be " + weight + " on that planet. " );
              }
              else if ( planet == 3 )
              {
                  weight = weight*2.65;
                  System.out.println( " Your weight would be " + weight + " on that planet. " );
              }
              else if ( planet == 4 )
              {
                  weight = weight*1.17;
                  System.out.println( " Your weight would be " + weight + " on that planet. " );
              }
              else if ( planet == 5 )
              {
                  weight = weight*1.05;
                  System.out.println( " Your weight would be " + weight + " on that planet. " );
              }
              else if ( planet == 6 )
              {
                  weight = weight*1.23;
                  System.out.println( " Your weight would be " + weight + " on that planet. " );
              }
          }
      }