Question

我的代码运行良好而没有错误，但程序假设你说你是等于，少于或大于计算机生成的数字（双倍），而且当我输入1或1.0时，计算机会生成a 2甚至有时候4，它说我是平等的，我不知所措，甚至不知道从哪里开始发现什么是错的。我得到的唯一线索是舍入可能会影响它，因为它正如你在代码中看到的那样四舍五入。

    String overOrUnder = "Over or Under?";
    String CompNumberString = "";
    double compNumber;
    String userNumberString = "";
    double userNumber;
               public void actionPerformed(ActionEvent e)
               {
                  generateCompNumber();
                  labelCompNumber.setText(String.valueOf(compNumber));
                  labelCompNumber.revalidate();
                  getUserInputToInteger();
                  labelUserNumber.revalidate();
                  labelUserNumber.setText(userNumberString);
                  overOrUnderOrEqual();
               }
           });
    }





        public void generateCompNumber()
        {
               compNumber = Math.random() * 5;
               compNumber = Math.round(compNumber * 1);
               compNumber = compNumber/1;
        }
        public void getUserInputToInteger()
        {
            userNumberString = jTextYourNumber.getText();
            userNumber = Double.parseDouble(userNumberString);
        }
        public void overOrUnderOrEqual()
        {
            labelOverOrUnder.setText(overOrUnder);
            if (compNumber == userNumber)
            {
                equal = true;
                overOrUnder = "RIGHT ON!";
            }
            else if (compNumber > userNumber)//comp greater user
            {
                equal = false;
                overOrUnder = "You was Under!";
            }
            else if (compNumber < userNumber)//comp less user
            {
                equal = false;
                overOrUnder = "You was Over!";
            }
        }

Answer 1

您的比较部分代码工作正常。只有错误是，你在评估字符串之前设置文本。 labelOverOrUnder.setText(overOrUnder);应该在if-else语句之后。这就是你得到错误信息的原因。这是修改后的代码。

class GMNR extends JFrame
{
    String overOrUnder = "Over or Under?";
    String CompNumberString = "";
    double compNumber;
    String userNumberString = "";
    double userNumber;
    Boolean equal;
    JPanel panelMain = new JPanel();
    JTextField jTextYourNumber = new JTextField(25);
    JButton buttonGenerate = new JButton("Generate");
    JLabel labelCompNumber = new JLabel();
    JLabel labelUserNumber = new JLabel();
    JLabel labelOverOrUnder = new JLabel();

    public GMNR()
    {
        //variables



        //end of variables
        setTitle("Guess My Number!");
        setVisible(true);
        setSize(1200, 500);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        panelMain.add(jTextYourNumber);
        jTextYourNumber.setBackground(Color.green);
        panelMain.setBackground(Color.yellow);
        panelMain.add(jTextYourNumber);
        panelMain.add(labelCompNumber);
        panelMain.add(labelUserNumber);
        panelMain.add(buttonGenerate);
        panelMain.add(labelOverOrUnder);
        add(panelMain);
        labelOverOrUnder.revalidate();
        buttonGenerate.addActionListener(new ActionListener()
           {
               public void actionPerformed(ActionEvent e)
               {
                  generateCompNumber();
                  labelCompNumber.setText(String.valueOf(compNumber));
                  labelCompNumber.revalidate();
                  getUserInputToInteger();
                  overOrUnderOrEqual();
                  labelUserNumber.setText(userNumberString);
                  labelUserNumber.revalidate();
               }
           });
    }





        public void generateCompNumber()
        {
               compNumber = Math.random() * 5;
               compNumber = Math.round(compNumber * 1);
               compNumber = compNumber/1;
        }
        public void getUserInputToInteger()
        {
            userNumberString = jTextYourNumber.getText();
            userNumber = Double.parseDouble(userNumberString);
        }
        public void overOrUnderOrEqual()
        {


            if (compNumber == userNumber)
            {
                equal = true;
                overOrUnder = "RIGHT ON!";
            }
            else if (compNumber > userNumber)//comp greater user
            {
                equal = false;
                overOrUnder = "You was Under!";
            }
            else if (compNumber < userNumber)//comp less user
            {
                equal = false;
                overOrUnder = "You was Over!";
            }
            labelOverOrUnder.setText(overOrUnder);
            System.out.println("compNumber "+compNumber+", userNumber "+userNumber+", "+overOrUnder);
        }
}

数学轮和解析问题

1 个答案: