Enum ProgII

Mar 22, 2009Download as ODP, PDF1 like360 views

Juanan Pereira

Un tipo enumerado es un tipo cuyos campos forman un conjunto fijo de constantes. Ejemplos : direcciones cardinales (NORTE, SUR, ESTE, OESTE)

d��as de la semana (LUNES, MARTES, MI?RCOLES, JUEVES, VIERNES, S?BADO, DOMINGO)

public enum DiaSemana { LUNES , MARTES , MIERCOLES , JUEVES , VIERNES , SABADO , DOMINGO } Tipos enumerados en Java

$public class Prueba { Dia day ; public Prueba(Dia day) { this . day = day; } public void comoEs() { switch ( day ) { case LUNES : System. out .println( "Lunes malos." ); break ; case VIERNES : System. out .println( "Viernes mejor." ); break ; case SABADO : case DOMINGO : System. out .println( "Fin de semana lo mejor." ); break ; default : System. out .println( "Resto d��as laborables, as��?-as��." ); break ; } } public static void main(String[] args) { Prueba primerDiaSemana = new Prueba(Dia. LUNES ); primerDiaSemana.comoEs(); Prueba tercerDiaSemana = new Prueba(Dia. MIERCOLES ); tercerDiaSemana.comoEs(); System. out .println( "D��as de la semana:" ); for (Dia d : Dia. values ()) { System. out .print(d + " \t" ); } }$

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); private final double mass ; // in kilograms private final double radius ; // in meters Planet( 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;

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Enum ProgII

1. Programaci��n II Tema 2 Tipos de Datos Enumerados 2008/2009 Juanan Pereira Departamento de LSI Facultad de Inform��tica Donostia [email_address]

2. Un tipo enumerado es un tipo cuyos campos forman un conjunto fijo de constantes. Ejemplos : direcciones cardinales (NORTE, SUR, ESTE, OESTE)

3. d��as de la semana (LUNES, MARTES, MI?RCOLES, JUEVES, VIERNES, S?BADO, DOMINGO)

4. public enum DiaSemana { LUNES , MARTES , MIERCOLES , JUEVES , VIERNES , SABADO , DOMINGO } Tipos enumerados en Java

5. public class Prueba { Dia day ; public Prueba(Dia day) { this . day = day; } public void comoEs() { switch ( day ) { case LUNES : System. out .println( "Lunes malos." ); break ; case VIERNES : System. out .println( "Viernes mejor." ); break ; case SABADO : case DOMINGO : System. out .println( "Fin de semana lo mejor." ); break ; default : System. out .println( "Resto d��as laborables, as��?-as��." ); break ; } } public static void main(String[] args) { Prueba primerDiaSemana = new Prueba(Dia. LUNES ); primerDiaSemana.comoEs(); Prueba tercerDiaSemana = new Prueba(Dia. MIERCOLES ); tercerDiaSemana.comoEs(); System. out .println( "D��as de la semana:" ); for (Dia d : Dia. values ()) { System. out .print(d + " \t" ); } }

6. 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); private final double mass ; // in kilograms private final double radius ; // in meters Planet( 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;

7. public enum Planet { [...] double surfaceGravity() { return G * mass / ( radius * radius ); } double surfaceWeight( double otherMass) { return otherMass * surfaceGravity(); } public static void main(String[] args) { double earthWeight = Double. parseDouble (args[0]); double mass = earthWeight/ EARTH .surfaceGravity(); for (Planet p : Planet. values ()) System. out .printf( "Your weight on %s is %f%n" , p, p.surfaceWeight(mass)); } } $ java Planet 175 Your weight on MERCURY is 66.107583 Your weight on VENUS is 158.374842 Your weight on EARTH is 175.000000

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Enum ProgII

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Enum ProgII