Write a simple Java application which calculates the cutoff frequency in a simpl

Question

Write a simple Java application which calculates the cutoff frequency in a simple RC circuit. Your application should ask the user to enter the capacitor and resistor values of the circuit. You must use the JOptionPane class to collect the user's input. The capacitor and resistor values should be treated as floating point values. Calculate the cutoff frequency in hertz: freq = 1 / (2 * pi * capacitor (in farads) * resistor (in ohms)). You must use the JOptionPane class to output the result. Your output must show two digits after the decimal point and contain explanatory text. Make sure you remember to import what your program will use.

Explanation / Answer

public class CutoffFrequency

{

public static void main ( String args[] )

{

String capacitor,resistor; // string entered by user

int c = 0, r = 0;

//read in the first number from user as a string

capacitor = JOptionPane.showInputDialog ( "Enter capacitance in farads" );

//read in the second number from user as a string

resistor = JOptionPane.showInputDialog ( "Enter resistance in ohms" );

//convert numbers from type String to type int

c= Integer.parseInt ( capacitor);

r= Integer.parseInt ( resistor);

//display the results

JOptionPane.showMessageDialog (

null, "The cutoff frequency is " + (1/(Math.PI*2*r*c)), "Results",

JOptionPane.PLAIN_MESSAGE);

System.exit ( 0 ); //ends the program

}

}

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