public static void main(String[] args) {
String input = JOptionPane.showInputDialog("请输入第一个数");
        double number1 = Double.parseDouble(input);
        String operator = JOptionPane.showInputDialog("请输入操作符");
        input = JOptionPane.showInputDialog("请输入第二个数");
        int number2 = 0;
        double number3 = 0;
        if ("^".equals(operator)) {
            number2 = Integer.parseInt(input);
        } else {
            number3 = Double.parseDouble(input);
        }
        if ("+".equals(operator)) {
            JOptionPane.showMessageDialog(null, number1 + number3 + " ");
        } else if ("-".equals(operator)) {
            JOptionPane.showMessageDialog(null, number1 - number3 + " ");
        } else if ("*".equals(operator)) {
            JOptionPane.showMessageDialog(null, number1 * number3 + " ");

        } else if ("/".equals(operator)) {
            JOptionPane.showMessageDialog(null, number1 / number3 + " ");

        } else if ("%".equals(operator)) {
            JOptionPane.showMessageDialog(null, number1 % number3 + " ");

        } else if ("^".equals(operator)) {
            double result = 1.0;

        }
        for (int i = 0; i < number2; i++) {

        }
        result *= number1;
        JOptionPane.showMessageDialog(null, result + " ");
    }
}
最后二句中的RESULT出现错误！！如果把最后二句删了程序也可以运行搞不懂了，能不能把这个程序每句解释下，谢谢~~

是一个计算器,这个程序是老师写的,我自己运行了一下,最后两句报错了,帮忙看下错在哪里？

试过了可以了！JAVA编程中是不是有的语法格式是死的？
比如说等于符号后面的语法是死的？：
        String input = JOptionPane.showInputDialog("请输入第一个数");
        double number1 = Double.parseDouble(input);
        String operator = JOptionPane.showInputDialog("请输入操作符");
        input = JOptionPane.showInputDialog("请输入第二个数");