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Steven! Ragnarök committed 531a937

Workin on page 3.

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+---
+layout: default
+title: page3
+---
+
+## Enum ##
+<div class=left>
+{% highlight java %}
+public enum Planet 
+{
+    MERCURY (3.303e+23, 2.4397e6),
+    VENUS   (4.869e+24, 6.0518e6),
+    EARTH   (5.976e+24, 6.37814e6),
+    MARS    (6.421e+23, 3.3972e6),
+    JUPITER (1.9e+27,   7.1492e7),
+    SATURN  (5.688e+26, 6.0268e7),
+    URANUS  (8.686e+25, 2.5559e7),
+    NEPTUNE (1.024e+26, 2.4746e7),
+    PLUTO   (1.27e+22,  1.137e6);
+
+    private final double mass;   // in kilograms
+    private final double radius; // in meters
+    
+    Planet(double mass, double radius) 
+    {
+        this.mass = mass;
+        this.radius = radius;
+    }
+    public double mass()   { return mass; }
+    public double radius() { return radius; }
+
+    // universal gravitational constant  (m3 kg-1 s-2)
+    public static final double G = 6.67300E-11;
+
+    public double surfaceGravity() 
+    {
+        return G * mass / (radius * radius);
+    }
+    public double surfaceWeight(double otherMass) 
+    {
+        return otherMass * surfaceGravity();
+    }
+}
+{% endhighlight %}
+</div>