I need to enter a string with a decimal to change to a double?

i know about the Double.parseDouble but it isn't working

import javax.swing.JOptionPane;

public class Circles
{
public static void main(String args[])
{
String input = JOptionPane.showInputDialog("Please Choose An Option\n" + "1. Area\n" + "2. Circumference\n" + "3. Area of a sector\n" + "4. Arc Length\n" + "5.Exit");

if (input.compareTo("1")==0)
{
runArea();
}
else if (input.compareTo("2")==0)
{
runCircumference();
}
else if (input.compareTo("3")==0)
{
runSector();
}
else if (input.compareTo("4")==0)
{
runArc();
}
else if (input.compareTo("5")==0)
{
System.out.println("Good Bye");
System.exit(0);
}
else
{
System.out.println("Error");
System.exit(0);
}

}
public static void runArea()
{
String input1 = JOptionPane.showInputDialog("Enter radius");
double radius = Integer.parseInt(input1);
double area = radius*radius*3.14;
System.out.println("Area = " + area);
}

public static void runCircumference()
{
String input2 = JOptionPane.showInputDialog("Enter radius");
double radius1 = Integer.parseInt(input2);
double circumference = 2*radius1*3.14;
System.out.println("Circumference = " + circumference);
}

public static void runSector()
{
String input3 = JOptionPane.showInputDialog("1. Radians\n" + "2.Degrees");

if (input3.compareTo("1")==0)
{
String input4 = JOptionPane.showInputDialog("Enter radius");
String input5 = JOptionPane.showInputDialog("Enter radians");
double radius2 = Integer.parseInt(input4);
double radian = Integer.parseInt(input5);
double sector= 0.5*radius2*radius2*radian;//check lata
System.out.println("Area of Sector = " + sector);


}
else if (input3.compareTo("2")==0)
{
String input6= JOptionPane.showInputDialog("Enter radius");
String input7= JOptionPane.showInputDialog("Enter degrees");
double radius3 = Integer.parseInt(input6);
double degree = Integer.parseInt(input7);
double sector1= degree/360*3.14*radius3*radius3;
System.out.println("Area of Sector = " + sector1);

}
else
{
System.out.println("Error");
System.exit(0);
}
}
public static void runArc()
{
String input8 = JOptionPane.showInputDialog("1. Using Radians\n"+"2. Using Degrees.");
if(input8.compareTo("1")==0)
{
String input9 = JOptionPane.showInputDialog("Enter radius");
String input10 = JOptionPane.showInputDialog("Enter radians");
double radius4 = Integer.parseInt(input9);
double radian2 = Integer.parseInt(input10);
double arc = radius4*radian2;
System.out.println("Arc Length = " + arc);
}
else if(input8.compareTo("2")==0)
{
String input11 = JOptionPane.showInputDialog("Enter radius");
String input12 = JOptionPane.showInputDialog("Enter degrees");
double radius5 = Integer.parseInt(input11);
double degree2 = Integer.parseInt(input12);
double arc1 = degree2*3.14/180*radius5;
System.out.println("Arc Length =" + arc1);
}
else
{
System.out.println("Error");
System.exit(0);
}

}
}

When you say that Double.parseDouble does not work what exactly do you mean?

Print the String before you do the parse. Add a character before and after like
System.out.println("#" + myString + "#");
so that you know exactly what you are trying to parse.
If you do not get an exception then print the result of the parse.