Question

Java program

Write a Temperature class that represents temperatures in degrees in both Celsius and Fahrenheit. Use a floating- point number for the temperature and a character for the scale, eitherでfor Celsius or 'F' for fahrenheit. The class should have Four constructors: one for the number of degrees, one for the scale, one for both the degrees and scale, and a default constructor. For each of these constructors, assume zero degrees if no value is specified and celsius if no scale is given Two accessor methods: one to return the temperature in degrees Celsius, the other to return it in degrees Fahrenheit. Use the formulas from programming project 5 of chapter 3 and round to the nearest tenth of a degree o Degrees_C5(Degrees_F- 32)/9 o DegreesF (9(Degrees_C)5) 32) Three set methods: one to set the number of degrees, one to set the scale and one to set both Three comparison methods: one to test whether two temperatures are equal, one to test whether one temperature is greater than the other, and one to test whether one temperature is less than the other Additionally write a driver a program that tests all the methods. Be sure to invoke each of the constructors, to include at least one true and one false case for each comparison method, and to test at least the following three temperature pairs for equality. 0.0 degrees C and 32.0 degrees F, -40.0 degrees C and -40.0 degrees F, and 100.0 degrees C and 212.0 Degrees F. Make sure in the Class file to appropriately comment your code with javadoc comments for every method. (Pre and post condition comments)

Answer 1

Java Program:

package temperatureclassdriver;

//Temperature Class
//Class definition
class Temperature {
  
    //Data memebers
    private double val;
    private char scale;
  
    //Methods

    //Default constructor
    public Temperature() {
        val = 0;
        scale = 'C';
    }

    //1-Arg
    public Temperature(double val) {
        this.val = val;
        this.scale = 'C';
    }
  
    //1-Arg
    public Temperature(char scale) {
        this.val = 0;
        this.scale = scale;
    }
  
    //2-Arg
    public Temperature(double val, char scale) {
        this.val = val;
        this.scale = scale;
    }
  
    //Accessor method
    double getTemp_Celsius() {
      
        //If its is in Celsius
        if(scale == 'C') {
            return val;
        }
      
        double mVal;
      
        mVal = ( 1.8 * val ) + 32.0;
      
        //Converting to Celsius
        return mVal;
    }
  
    //Accessor method
    double getTemp_Fahrenheit() {
        //If its is in Fahrenheit
        if(scale == 'F') {
            return val;
        }
      
        double mval;
      
        //Applying conversion
        mval = (double)((5/9.0) * (val - 32));
      
        //Converting to Celsius
        return mval;
    }

    //Setter method
    public void setVal(double val) {
        this.val = val;
    }

    //Setter method
    public void setScale(char scale) {
        this.scale = scale;
    }
  
    //Setter Method
    public void setValues(double val, char scale) {
        this.val = val;
        this.scale = scale;
    }

    //Compares two Objects
    public boolean equals(Temperature obj) {
      
        //Comparing scales
        if (this.getTemp_Fahrenheit() != obj.getTemp_Fahrenheit()) {
            return false;
        }
        return true;
    }
  
    //Compares to Objects
    public boolean isGreater(Temperature obj) {
      
        //Comparing scales
        if (this.getTemp_Celsius() > obj.getTemp_Celsius()) {
            return true;
        }
        return false;
    }
  
    //Compares to Objects
    public boolean isLesser(Temperature obj) {
      
        //Comparing scales
        if (this.getTemp_Celsius() < obj.getTemp_Celsius()) {
            return true;
        }
        return false;
    }
}

//Class definition
public class TemperatureClassDriver {

    //Main method
    public static void main(String[] args) {
      
        //Testing Temperature class
        Temperature t1 = new Temperature(32, 'C');
        Temperature t2 = new Temperature(20);
        Temperature t3 = new Temperature('F');
      
        //Comparing temperatures t1 and t2
        if(t1.isGreater(t2)) {
            System.out.println(" Temperature 1 is greater than Temperature 2 ");
        }
        else {
            System.out.println(" Temperature 1 is less than Temperature 2 ");
        }
              
        //Comparing temperatures t2 and t3
        if(t2.isLesser(t3)) {
            System.out.println(" Temperature 2 is less than Temperature 3 ");
        }
        else {
            System.out.println(" Temperature 2 is greater than Temperature 3 ");
        }
      
        //Creating 6 temperature objects
        Temperature t11 = new Temperature(0, 'C');
        Temperature t12 = new Temperature(32.0, 'F');
      
        Temperature t13 = new Temperature(-40.0, 'C');
        Temperature t14 = new Temperature(-40.0, 'F');
      
        Temperature t15 = new Temperature(100.0, 'C');
        Temperature t16 = new Temperature(212.0, 'F');
      
        //Comparing objects
        if(t11.equals(t12)) {
            System.out.println(" Both are same ");
        }
        else {
            System.out.println(" Both are not same ");
        }
      
        if(t13.equals(t14)) {
            System.out.println(" Both are same ");
        }
        else {
            System.out.println(" Both are not same ");
        }
      
        if(t15.equals(t14)) {
            System.out.println(" Both are same ");
        }
        else {
            System.out.println(" Both are not same ");
        }
    }
}

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Sample Run:

Output Debugger Console X | TemperatureClassDriver (run) as Temperature 1 is greater than Temperature 2 Temperature 2 is less than Temperature 3 Both are not same Both are same Both are not same BUILD SUCCESSFUL (total time: 0 seconds)