Question

public static void main(String[] args) {

    String password, firstOption, firstNumber = "";
    int number, option;
    password = JOptionPane.showInputDialog("Please Enter Password");

    // now starts code
    if (password.equals("HW1")) {
        firstOption = JOptionPane.showInputDialog("Please select an option: \n0 = Quit \n1= Math Time");
        option = Integer.parseInt(firstOption);

        if (option == 0) {
            JOptionPane.showMessageDialog(null, "You Quit!", "Quitter!", JOptionPane.OK_CANCEL_OPTION);
        } else {
            firstNumber = JOptionPane.showInputDialog("Please enter a number between 1-30:");
            number = Integer.parseInt(firstNumber);
            if (number <= 30 && number >= 0) {
                JOptionPane.showMessageDialog(null, "The number " + number + " to the second power is " + number,
                        "Math Time", JOptionPane.OK_OPTION);
            } else {
                JOptionPane.showMessageDialog(null, "That is not a number between 1-30",
                        "Idiot Alert!", JOptionPane.OK_OPTION);
            }
        }
     else {
        JOptionPane.showMessageDialog(null, "Incorrect Password", "Incorrect Password", JOptionPane.OK_OPTION);
    }
}

问题在于最后一个else语句，我希望它对应于if语句（password.equals（“HW1”）

基本上我希望它检查并查看密码是否为HW1，如果是，则运行if语句中的所有代码。如果没有，请运行else语句

Answer 1

你的其他陈述超出范围 - 你没有把它放在正确的位置。

你应该看一下

的内容

if(password.equals("HW1") {
    //The password was correct
    ...
} else {
    //The password was incorrect
    JOptionPane.showMessageDialog(null,"Incorrect Password", "Incorrect Password", JOptionPane.OK_OPTION);
}

Answer 2

在您撰写if之前，您没有关闭第一个else 使第二个if具有双倍else ...

尝试在最后}之前添加else！

Answer 3

您缺少一个结束花括号。缩进告诉你。

变化：

        }
    }
 else {

要：

        }
    }
 } else {

Answer 4

好的，在其他和括号

之间切换

          else
        JOptionPane.showMessageDialog(null,"Incorrect Password", "Incorrect Password", JOptionPane.OK_OPTION);
        }

在if的括号外面取其他。

Answer 5

你忘了一个括号，试试这个：

public static void main(String[] args) {

    String password, firstOption, firstNumber = "";
    int number, option;
    password = JOptionPane.showInputDialog("Please Enter Password");

    // now starts code
    if (password.equals("HW1")) {
        firstOption = JOptionPane.showInputDialog("Please select an option: \n0 = Quit \n1= Math Time");
        option = Integer.parseInt(firstOption);

        if (option == 0) {
            JOptionPane.showMessageDialog(null, "You Quit!", "Quitter!", JOptionPane.OK_CANCEL_OPTION);
        } else {
            firstNumber = JOptionPane.showInputDialog("Please enter a number between 1-30:");
            number = Integer.parseInt(firstNumber);
            if (number <= 30 && number >= 0) {
                JOptionPane.showMessageDialog(null, "The number " + number + " to the second power is " + number,
                        "Math Time", JOptionPane.OK_OPTION);
            } else {
                JOptionPane.showMessageDialog(null, "That is not a number between 1-30",
                        "Idiot Alert!", JOptionPane.OK_OPTION);
            }
        }
    } else {  // Modified: Bracket added
        JOptionPane.showMessageDialog(null, "Incorrect Password", "Incorrect Password", JOptionPane.OK_OPTION);
    }
}

我的Java程序一直告诉我，如果没有if，我就不能把我的else语句放进去，但我已经有了

5 个答案: