JAVA 【finding runway length】

问题及代码：

import java.util.Scanner;import javax.swing.JOptionPane;public class first {public static void main(String[] args) {System.out.println("请输入v和a：");Scanner tv = new Scanner(System.in);Scanner ta = new Scanner(System.in);double v = tv.nextDouble();double a = ta.nextDouble();double length = v * v / (2 * a);JOptionPane.showMessageDialog(null, length, "finding runway length",JOptionPane.INFORMATION_MESSAGE);}}

运行结果：