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Write a Temperature class that has two instance variables: a temperature value (a floating-point number) and a character for the scale, either C for Celsius or F for Fahrenheit. The class should have a number of constructor methods: one with two parameters for the two instance variables, and a noargument constructor (set to zero degrees Celsius). Include the following:

(1) two accessor methods to return the temperature one to return the degrees Celsius, the other to return the degrees Fahrenheit use the following formulas to write the two methods, and round to the nearest tenth of a degree: degreesC = 5(degreesF - 32)/9 degreesF = (9(degreesC)/5) + 32

(2) three mutator or set methods: one to set the value, one to set the scale (F or C), and one to set both; (3) three comparison methods: an equals method to test whether two temperatures are equal, one method to test whether one temperature is greater than another, and one method to test whether one temperature is less than another (note that a Celsius temperature can be equal to a Fahrenheit temperature as indicated by the above formulas); and (4) a suitable toString method. Then write a driver program (or programs) that tests all the methods. Be sure to use each of the constructors, to include at least one true and one false case for each of the comparison methods, and to test at least the following temperature equalities: 0.0 degrees C = 32.0 degrees F, -40.0 degrees C = -40.0 degrees F, and 100.0 degrees C = 212.0 degrees F.

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April 22, 2011 at 5:19 PM

class Temperature{

private double value;
private char scale;

public Temperature(){
value = 0;
scale = 'C';
}

public Temperature(double value, char scale){
setTemperature(value, scale);
}

public double getTempInCelsius(){
if(scale == 'C'){
return value;
}else {
return (double)5/9 *(value - 32);
}
}

public double getTempInFahrenheit(){
if(scale == 'F'){
return value;
}else {
return (double)(9/5 *(value)) + 32;
}
}
public void setValue(double value){
    this.value=value;
}
public void setScale(char scale){
    this.scale=scale;
}
public void setTemperature(double value, char scale){
this.value = value;
if (scale == 'F'){
this.scale = scale;
}else {
this.scale = 'C';
}
}
public boolean isGreater(Temperature another){
return (this.getTempInCelsius()> another.getTempInCelsius() );
}
public boolean equals(Temperature another){
return (this.getTempInCelsius()== another.getTempInCelsius() );
}
public boolean isSmaller(Temperature another){
return (this.getTempInCelsius()< another.getTempInCelsius() );
}
public String toString (){
return "temperature : "+value + " " + scale;
}
}
public class TemperatureConverter{
public static void main(String[] args){
Temperature temp1=new Temperature(30, 'F');
Temperature temp2=new Temperature(15, 'C');

if (temp1.isGreater( temp2)){
System.out.println(temp1 + "is greater than " + temp2);
}
else {
System.out.println(temp2 + "is greater than " + temp1);
}
System.out.println("Temperature in Fahrenheit " + temp1 + " is "+ temp1.getTempInCelsius()+" C");
System.out.println("Temperature in Celcius " + temp2 + " is "+ temp1.getTempInFahrenheit()+" F");

Temperature temp3=new Temperature(0, 'C');
Temperature temp4=new Temperature(-40, 'C');
Temperature temp5=new Temperature(100, 'C');

System.out.println("0 degree C"+ "="+ temp3.getTempInFahrenheit()+" degree F");
System.out.println("-44 degree C"+ "="+ temp4.getTempInFahrenheit()+" degree F");
System.out.println("100 degree C"+ "="+ temp5.getTempInFahrenheit()+" degree F");
  }
}