Converter

public class Main {

    public static void main(String[] args) {

        Conv cf = new Conv();
        cf.convTemp('F');
    }
}


public class Conv {

    float temp = 36;
    char convTo;

    public void convTemp(char convTo) {

        if (convTo == 'F') {
            System.out.println("Current temperature is " + temp + "C");
            temp = (temp - 32) * (5 / 9);
            System.out.println("That equals to " + temp + "F");
        } else if (convTo == 'C') {
            System.out.println("Current temperature is " + temp + "F");
            temp = (temp + 32) * (9 / 5);
            System.out.println("Temperature equals to " + temp + "C");
        } else {
            System.out.println("Undefined value");
        }
    }
}