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POProgramming using enum
 

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    <p>I was trying out a sample program from Java tutorials,using enum. I was not able to get a correct output for the code.I think the problem is with my understanding of the code.Can anyone please help me to interpret it correctly.I understood most of the code,but would like to confirm the use of following piece of code in the program :</p> <pre><code>if (args.length != 1) { System.err.println("Usage: java Planet &lt;earth_weight&gt;"); System.exit(-1); } </code></pre> <p>My output is : </p> <pre><code>Usage: java Planet &lt;earth_weight&gt; </code></pre> <p>Following is my code:</p> <pre><code>public enum EnumPlanet { 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); private final double mass; // in kilograms private final double radius; // in meters EnumPlanet(double mass, double radius) { this.mass = mass; this.radius = radius; } private double mass() { return mass; } private double radius() { return radius; } // universal gravitational constant (m3 kg-1 s-2) public static final double G = 6.67300E-11; double surfaceGravity() { return G * mass / (radius * radius); } double surfaceWeight(double otherMass) { return otherMass * surfaceGravity(); } public static void main(String[] args) { if (args.length != 1) { System.err.println("Usage: java Planet &lt;earth_weight&gt;"); System.exit(-1); } double earthWeight = Double.parseDouble(args[0]); double mass = earthWeight/EARTH.surfaceGravity(); for (EnumPlanet p : EnumPlanet.values()) System.out.printf("Your weight on %s is %f%n", p, p.surfaceWeight(mass)); } } </code></pre>
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