Exception in thread "main" java.lang.NullPointerException at lab2.Test.main(Test.java:23)
package lab2;
import java.io.Console;
public class Test {
public static void main(String []args) {
Console cnsl = null;
String payload = null;
// creates a console object
cnsl = System.console();
// read line from the user input
its a run time error , it shows the null exception
payload = cnsl.readLine("Enter weight of the payload in lb: ");
// prints
pay = Float.parseFloat(payload);;
read line from the user input double hello = ((8 * pay * POUNDINKILO * ACCELERATION_GRAVITY)/(PI * ROWDENSITY * 0.75 * VOLUME * VOLUME));
D = Math.sqrt(hello);
System.out.println("For a payload of : " + payload);
System.out.println("\nFor a payload of : " + payload);
System.out.println("Radius is : " + D);
}
}