简单的程序,只需找到圆的圆周,直径和面积。每当我运行程序时它就没问题了,就在最后,在Area的值之后总是有1或-1。例如,当使用半径为10时,我得到:
结果
圆的周长为:62.832厘米
圆的直径为:20.0厘米
圆的面积是:314.159厘米1
代码如下:
import javax.swing.JOptionPane;
import java.text.DecimalFormat;
public class Circle {
public static void main(String[] args)
{
//Declarations
double radius;
String getRadius;
//Formatting
DecimalFormat formatter = new
DecimalFormat(".000");
//Calculations
getRadius = JOptionPane.showInputDialog("Enter Circle Radius In Centimeters:");
radius = Double.parseDouble(getRadius);
//Output
JOptionPane.showMessageDialog(null, "Results" +
"\n The circumference of the circle is: " + formatter.format(2*Math.PI*radius) + " Centimeters" +
"\n The diameter of the circle is: " + 2*radius + " Centimeters" +
"\n The area of the circle is: " + formatter.format(Math.PI*Math.pow(radius,2)) + " Centimeters" +
JOptionPane.INFORMATION_MESSAGE);
}
}
答案 0 :(得分:1)
您将JOptionPane.INFORMATION_MESSAGE
(恰好等于1)追加到您的字符串中。它应该是这样的:
JOptionPane.showMessageDialog(null,
"Results" +
"\n The circumference of the circle is: " + formatter.format(2*Math.PI*radius) + " Centimeters" +
"\n The diameter of the circle is: " + 2*radius + " Centimeters" +
"\n The area of the circle is: " + formatter.format(Math.PI*Math.pow(radius,2)) + " Centimeters",
"Results",
JOptionPane.INFORMATION_MESSAGE);
这四个参数是parent,message,title,messageType。之前,您不小心使用了双参数版本(父级,消息)并将messageType附加到您的消息中。