Oppgave a) Objektstrukturer (12 %) Fyll inn vedlagte Temperature. Temperature har oversikt over en temperatur som enten er i Fahrenheit eller i Celsius. Temperature har følgende metoder - Temperature(double degrees, char scale) - Initialiserer et Temperature-objekt med en skala (Fahrenheit/Celsius) og et antall grader
- getScale() - Returnerer om temperaturen er i Fahrenheit eller Celsius.
- getDegrees() - Returnerer temperaturen i antall grader.
- toOther() - Gjør om dette temperatur-objektet til den andre skalaen og returnerer det.
- inOther() - Lager et nytt temperatur-objekt i den den andre skalaen og returnerer det.
- lower(double amount) - Senker temperaturen med et antall grader.
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| title | Skjelett til del 4Kodeskjelett 4a |
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| package del4;
public class Temperature {
// Add any needed fields
/**
*
* @param degrees an arbitrary number
* @param scale a character declaring the scale
*
* @throws IllegalArgumentException if scale is not 'C' or 'F'
*/
public Temperature(double degrees, char scale) {
// TODO
}
/**
*
* @return The current scale
*/
public char getScale() {
// TODO
return '0';
}
/**
*
* @return the current degree of this object
*/
public double getDegrees() {
// TODO
return 0;
}
/**
* Converts this temperature object to be the opposite scale of what it
* currently is
*
* @return this temperature object, converted with value in Celsius if the scale
* of this temperature object is Fahrenheit, and value in Fahrenheit if
* this the scale of this temperature object is Celsius
*/
public Temperature toOther() {
// TODO
return null;
}
/**
* Creates a new temperature object with values in the other scale of this
* temperature object
*
* @return a new Temperature object, with value in Celsius if the scale of this
* temperature object is Fahrenheit, and value in Fahrenheit if the
* scale of this temperature object is Celsius
*/
public Temperature inOther() {
// TODO
return null;
}
/**
* Lowers the temperature
*
* @param amount the amount to lower by
*/
public void lower(double amount) {
// TODO
}
/**
*
* @param celsius
* @return the temperature in Fahrenheit
*/
public static double convertCelsisusToFahrenheit(double celsius) {
return (celsius * 1.8 + 32.0);
}
/**
*
* @param fahrenheit
* @return the temperature in Celsius
*/
public static double convertFahrenheitToCelsius(double fahrenheit) {
return (fahrenheit - 32.0) / 1.8;
}
public static void main(String[] args) {
Temperature t = new Temperature(20, 'C');
// Should print 20
System.out.println(t.getDegrees());
t.lower(10);
// Should now print 10
System.out.println(t.getDegrees());
t.toOther();
// Should now print 50
System.out.println(t.getDegrees());
t.toOther();
Temperature t2 = t.inOther();
// Should be 50;
System.out.println(t2.getDegrees());
// Should be 10
System.out.println(t.getDegrees());
}
}
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| package del4;
public class Temperature {
private char scale; // Only valid values are C or F
private double degree;
/**
*
* @param degrees an arbitrary number
* @param scale a character declaring the scale
*
* @throws IllegalArgumentException if scale is not 'C' or 'F'
*/
public Temperature(double degrees, char scale) {
this.degree = degrees;
if (scale != 'C' && scale != 'F') {
throw new IllegalArgumentException();
}
this.scale = scale;
}
/**
*
* @return The current scale
*/
public char getScale() {
return scale;
}
/**
*
* @return the current degree of this object
*/
public double getDegrees() {
return degree;
}
/**
* Converts this temperature object to be the opposite scale of what it
* currently is
*
* @return this temperature object, converted with value in Celsius if the value
* of this temperature object is Fahrenheit, and value in Fahrenheit if
* this temperature object is Celsius
*/
public Temperature toOther() {
if (this.scale == 'C') {
this.scale = 'F';
this.degree = convertCelsisusToFahrenheit(this.degree);
}
else {
this.scale = 'C';
this.degree = convertFahrenheitToCelsius(this.degree);
}
return this;
}
/**
* Creates a new temperature object with values in the other scale of this
* temperature object.
*
* @return a new Temperature object, with value in Celsius if the value of this
* temperature object is Fahrenheit, and value in Fahrenheit if this
* temperature object is Celsius
*/
public Temperature inOther() {
if (this.scale == 'C') {
return new Temperature(convertCelsisusToFahrenheit(this.degree), 'F');
}
else {
return new Temperature(convertFahrenheitToCelsius(this.degree), 'C');
}
}
/**
* Lowers the temperature
* @param amount the amount to lower by
*/
public void lower(double amount) {
this.degree -= amount;
}
/**
*
* @param celsius
* @return the temperature in Fahrenheit
*/
public static double convertCelsisusToFahrenheit(double celsius) {
return (celsius * 1.8 + 32.0);
}
/**
*
* @param fahrenheit
* @return the temperature in Celsius
*/
public static double convertFahrenheitToCelsius(double fahrenheit) {
return (fahrenheit - 32.0) / 1.8;
}
public static void main(String[] args) {
Temperature t = new Temperature(20, 'C');
// Should print 20
System.out.println(t.getDegrees());
t.lower(10);
// Should now print 10
System.out.println(t.getDegrees());
t.toOther();
// Should now print 50
System.out.println(t.getDegrees());
t.toOther();
Temperature t2 = t.inOther();
// Should be 50;
System.out.println(t2.getDegrees());
// Should be 10
System.out.println(t.getDegrees());
}
}
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Oppgave b) Delegering (8%) Fyll inn DelegatingTemperature. DelegatingTemperature skal delegere til et underliggende Temperature-objekt og ha metodene beskrevet under. Du kan gå ut ifra at alle metodene til delegaten fungerer slik de skal. - DelegatingTemperature(Temperature delegate, char scale) - Oppretter et DelegatingTemperature-objekt med en skala (Fahrenheit/Celsisus) og et antall grader som er representert i delegaten.
- getScale() - Returnerer om temperaturen er i Fahrenheit eller Celsius.
- getDegrees() - Returnerer temperaturen i antall grader.
- toOther() - Gjør om dette temperatur-objektet til den andre skalaen og returnerer det.
- inOther() - Lager et nytt temperatur-objekt i den den andre skalaen og returnerer det.
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| package del4;
public class DelegatingTemperature {
// Add any needed fields
/**
*
* @param delegate - the Temperature to get degree from
* @param scale a character declaring the scale of this temperature object
*
* @throws IllegalArgumentException if scale is not 'C' or 'F'
*/
public DelegatingTemperature(Temperature delegate, char scale) {
// TODO
}
/**
*
* @return The current scale
*/
public char getScale() {
// TODO
return '0';
}
/**
*
* @return the current degree from the delegate, converted to the correct scale
*/
public double getDegrees() {
// TODO
return 0;
}
/**
*
* @return this temperature object, with scale converted to Celsius if the
* current scale of this delegatingTemperature object is in Fahrenheit,
* and value in Fahrenheit if this delegatingTemperature object is in
* Celsius
*/
public DelegatingTemperature toOther() {
// TODO
return null;
}
/**
*
* @return a new DelegatingTemperature object, with the same delegate, with
* scale converted to Celsius if the current scale of this
* delegatingTemperature object is Fahrenheit, and value in Fahrenheit
* if this delegatingTemperature object is Celsius
*/
public DelegatingTemperature inOther() {
// TODO
return null;
}
public static void main(String[] args) {
Temperature t = new Temperature(10, 'C');
DelegatingTemperature dt = new DelegatingTemperature(t, 'F');
// Should now print 10
System.out.println(t.getDegrees());
// Should now print 50
System.out.println(dt.getDegrees());
dt.toOther();
// Should now print 10
System.out.println(dt.getDegrees());
// Should now print 10
System.out.println(t.getDegrees());
}
}
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| package del4;
public class DelegatingTemperature {
// Add any needed fields
private Temperature delegate;
private char scale;
/**
*
* @param delegate - the Temperature to get degree from
* @param scale a character declaring the scale of this temperature object
*
* @throws IllegalArgumentException if scale is not 'C' or 'F'
*/
public DelegatingTemperature(Temperature delegate, char scale) {
this.delegate = delegate;
this.setScale(scale);
}
/**
*
* @return The current scale
*/
public char getScale() {
return this.scale;
}
private void setScale(char scale) {
if (scale != 'F' && scale != 'C') {
throw new IllegalArgumentException() ;
}
this.scale = scale;
}
/**
*
* @return the current degree from the delegate, converted to the correct scale
*/
public double getDegrees() {
if (this.scale == this.delegate.getScale()) {
return this.delegate.getDegrees();
}
return this.delegate.inOther().getDegrees();
}
/**
*
* @return this temperature object, with scale converted to Celsius if the
* current scale of this delegatingTemperature object is in Fahrenheit, and
* value in Fahrenheit if this delegatingTemperature object is in Celsius
*/
public DelegatingTemperature toOther() {
this.scale = this.scale == 'C' ? 'F' : 'C';
return this;
}
/**
*
* @return a new DelegatingTemperature object, with the same delegate, with
* scale converted to Celsius if the current scale of this
* delegatingTemperature object is Fahrenheit, and value in Fahrenheit
* if this delegatingTemperature object is Celsius
*/
public DelegatingTemperature inOther() {
return new DelegatingTemperature(this.delegate, this.scale == 'C' ? 'F' : 'C');
}
public static void main(String[] args) {
Temperature t = new Temperature(10, 'C');
DelegatingTemperature dt = new DelegatingTemperature(t, 'F');
// Should now print 10
System.out.println(t.getDegrees());
// Should now print 50
System.out.println(dt.getDegrees());
dt.toOther();
// Should now print 10
System.out.println(dt.getDegrees());
// Should now print 10
System.out.println(t.getDegrees());
}
}
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