JOptionPane.showInputDialog

import javax.swing.JOptionPane;
public class AreaAndCircumferenceProgram {
	public static final double PI=3.14;
	public static void main(String args[]) throws ArrayIndexOutOfBoundsException
	{
		double radius;//有异常.没有调出
		double area;
		double circumference;
		String radiusString;
		String outputStr;

		radiusString=JOptionPane.showInputDialog("Enter the radius:");
		radius=Double.parseDouble(radiusString);
		area=PI*radius*radius;
		circumference=2*PI*radius;
		outputStr="Radius:"+radius+"\n"+"Area:"+area+"square units\n"+
		"Circumference"+circumference+"units";

		JOptionPane.showMessageDialog(null,outputStr,"Circle",JOptionPane.INFORMATION_MESSAGE);
		System.exit(0);