bhavna
java
1 Answer(s)      5 years and 11 months ago
Posted in : Java Beginners

write a java program considering that the trunk calls of a telephone exchange. a trunk call can be ordinary , urgent or lightning. The charges depend on the duration and the type of the call. Wrtie a program using the concept of Polymorphism inJava to calculate teh charges.

May 10, 2011 at 2:59 PM

```import java.util.*;
class Calls{
float dur;
String type;
float rate(){
if(type.equals("urgent"))
return 4.5f;
else if(type=="lightning")
return 3.5f;
else
return 3f;
}
}
class Bill extends Calls{
float amount;
Scanner input=new Scanner(System.in);
System.out.print("Enter Call Type(urgent,lightning,ordinary): ");
type=input.next();
System.out.print("Enter Call duration:");
dur=input.nextFloat();
}
void calculate(){
if(dur<=1.5){
amount=rate()*dur+1.5f;
}
else if(dur<=3){
amount=rate()*dur+2.5f;
}
else if(dur<=5){
amount=rate()*dur+4.5f;
}
else{
amount=rate()*dur+5f;
}
}
void print(){
System.out.println(" Call Type : "+type);
System.out.println(" Duration : "+dur);
System.out.println(" Charge: "+amount);
}
}
class TelephoneExchange{
public static void main(String arg[]){
Bill b=new Bill();
b.calculate();
b.print();
}
}
```

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