Assignment #38 and Space Boxing

Code

                       /// Name: Graham Pollock
                       /// Period: 5
                       /// Program Name: Space Boxing   
                       /// File Name: SpaceBoxing.java
                       /// Date Finished: 10/27/2015/
    
    import java.util.Scanner;
        
    public class SpaceBoxing
    {
    	public static void main( String[] args )
    	{
            Scanner keyboard = new Scanner(System.in);
    		     
            System.out.print("Please enter your current earth weight:  ");
            double weight = keyboard.nextDouble();
            
            double venus = 0.78;
    		double mars = 0.39;
    		double jupiter = 2.65;
    		double saturn = 1.17;
    		double uranus = 1.05;
    		double neptune = 23;
                
            
            double weight2;
    		String planeit = "";
    
            
            System.out.println(" ");
            System.out.println( "I have information for the following planets: " );
            System.out.println(" 1. Venus   2.Mars    3. Jupiter ");
            System.out.println(" 4. Saturn  2.Uranus  3. Neptune ");
            
            System.out.println(" ");
            System.out.print("Which planet are you visiting? (Numnber:) ");
            int planet = keyboard.nextInt();
    
            if (planet == 1) 
    		{
    			weight2 = weight * venus;
    			planeit = "Venus: " + weight2;
    		}
    		else if (planet == 2)
    		{
    			weight2 = weight * mars;
    			planeit = "Mars: " + weight2;
    		}
    		else if (planet == 3)
    		{
    			weight2 = weight * jupiter;
    			planeit = "Jupiter: " + weight2;
    		}
    		else if (planet == 4) 
    		{
    			weight2 = weight * saturn;
    			planeit = "Saturn: " + weight2;
    		}
    		else if (planet == 5) 
    		{
    			weight2 = weight * uranus;
    			planeit = "Uranus: " + weight2;
    		}
    		else if (planet == 6)
    		{
    			weight2 = weight * neptune;
    			planeit = "Neptune: " + weight2;
    		}
    
    
    		else {
    			System.out.println("Error - try again!");
    		}
    
            System.out.println( planeit );
            
            
            
            
            
    	}
    }
    

Picture of the output