我是一名新手，但我们直接进入问题：
当我为一个班级项目计算器编写以下代码时，我遇到了一个“令牌错误”。这是完整的错误消息：
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Syntax error on token "else", delete this token
at calculatorApplet.main(calculatorApplet.java:42)
我写了这段代码：
import java.util.Scanner;
import javax.swing.JOptionPane;
public class calculatorApplet
{
Scanner sc = new Scanner(System.in);
public static void main(String[] args)
{
JOptionPane.showMessageDialog(null, "Welcome to the Calculator!");
String option = JOptionPane.showInputDialog(null, "Which calculator mode do you want?");
if (option.equals("Addition"))
{
Double add1 = Double.parseDouble(JOptionPane.showInputDialog(null, "Okay type the first number(s) of your addition problem."));
Double add2 = Double.parseDouble(JOptionPane.showInputDialog(null, "Now type the second number(s) of your addition problem."));
Double preAdd = add1+add2;
Double Add = preAdd;
JOptionPane.showMessageDialog(null, "The sum is " + Add + ".");
}
else
{
JOptionPane.showMessageDialog(null, "Huh?");
}
if (option.equals("Subtraction"))
{
Double sub1 = Double.parseDouble(JOptionPane.showInputDialog(null, "Okay type the first number(s) of your subtraction problem."));
Double sub2 = Double.parseDouble(JOptionPane.showInputDialog(null, "Now type the second number(s) of your subtraction problem."));
Double preSub = sub1-sub2;
Double Sub = preSub;
JOptionPane.showMessageDialog(null, "The difference is " + Sub + ".");
}
else
{
JOptionPane.showMessageDialog(null, "Huh?");
}
if (option.equals("Multiplication"));
{
Double mult1 = Double.parseDouble(JOptionPane.showInputDialog(null, "Okay type the first number(s) of your multiplication problem."));
Double mult2 = Double.parseDouble(JOptionPane.showInputDialog(null, "Now type the second number(s) of your multiplication problem."));
Double preMult = mult1*mult2;
Double Mult = preMult;
JOptionPane.showMessageDialog(null, "The product is " + Mult + ".");
}
else //Here is the error.
{
JOptionPane.showMessageDialog(null, "Huh?");
} //Here ends the error.
if (option.equals("Division"))
{
Double div1 = Double.parseDouble(JOptionPane.showInputDialog(null, "Okay type the first number(s) of your division problem."));
Double div2 = Double.parseDouble(JOptionPane.showInputDialog(null, "Now type the second number(s) of your division problem."));
Double preDiv = div1/div2;
Double Div = preDiv;
JOptionPane.showMessageDialog(null, "The quotient is " + Div + ".");
}
else
{
JOptionPane.showMessageDialog(null, "Huh?");
}
//End of if statements.
}
}
这是代码，我在标记令牌错误的区域进行了注释。也许解决方案就在我的面前。我希望我的代码可以成为一个计算器，所以如果你们能修复我的代码，使其不与数学运算冲突，那就谢谢了，我非常感激任何帮助。