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OOP with Java 3
1 Answer(s)      4 years and 10 months ago
Posted in : Java Beginners


Write a Temperature class that has two instances variables: temperature value (a floating-point number) and a character for the scale, wither C for Celsius or F for Fahrenheit. the class should have four constructor methods: one for each instances variable (assume zero degrees if no value is specified and Celsius if no scale is specified). one with two parameters fir the two instance variables, and a no-argument constructor (set to zero degree Celsius). Include the following:

a. 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

degreeC = 5(degreeF - 32)/9
degreeF = (9(degreeC)/5) + 32

b. Three mutator methods: one to set the value, one to set the scale (F or C). and one to set both.

Then write a driver program that tests all the methods.

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February 10, 2010 at 3:50 PM


Hi Friend,

Try the following code:

import java.util.*;
class Temperature{
double temp;
char scale;
Temperature(double temp,char scale){
this.temp=temp;
this.scale=scale;
}
Temperature(char scale){
setTemp(0);
this.scale=scale;
}
Temperature(double temp){
this.temp=temp;
setScale('C');
}

public void setTemp(double temp){
temp=temp;
}
public void setScale(char scale){
scale=scale;
}
public double convertToCelsius(){
double c= (temp - 32) / 1.8;
return c;
}
public double convertToFahrenheit(){
double f=(temp*1.8+32);
return f;
}
public static void main(String[] args){
Scanner input=new Scanner(System.in);
System.out.print("Enter temperature: ");
double t=input.nextDouble();
System.out.print("Enter scale: ");
String s=input.next();
char ch=s.charAt(0);
if((ch=='C')&&(t!=0)){
Temperature t1=new Temperature(t,ch);
double tempF=t1.convertToFahrenheit();
System.out.println(tempF+"F");
}
else if((ch=='F')&&(t!=0)){
Temperature t2=new Temperature(t,ch);
double tempC=t2.convertToCelsius();
System.out.println(tempC+"C");
}
else if((ch!=' ')&&(t==0)){
Temperature t3=new Temperature(ch);
if(ch=='C'){
double tempF=t3.convertToFahrenheit();
System.out.println(tempF+"F");
}
else if(ch=='F'){
double tempC=t3.convertToCelsius();
System.out.println(tempC+"C");
}
}
else if((ch==' ')&&(t!=0)){
Temperature t4=new Temperature(t);
double tempF=t4.convertToFahrenheit();
System.out.println(tempF+"F");
}
}
}

Hope that it will be helpful for you.
Thanks


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