/** * * @author xiaolei */import javax.swing.JOptionPane;public class EX2_1 {    public static void main(String[] args) {        String input;        double c;  //攝氏度        double f;  //華氏度                input = JOptionPane.showInputDialog(null,                "輸入一個華氏溫度：",                "EX2_1",                JOptionPane.QUESTION_MESSAGE);                f = Double.parseDouble(input);                c = 5.0 * (f - 32) / 9;                JOptionPane.showMessageDialog(null, "華氏" + f + "F => 攝氏" + c + "C" );    }}