一个项目在日食中运行需要多长时间？**固定**

Question

好吧，所以我在我的学校有一个计算机科学项目。该项目是创建一个GUI，用于计算应该对个人收入征收多少税款。我遇到的问题是，每次我想运行程序时都需要3分钟才能使程序实际启动。包括我的老师在内的很多人都说这不正常。这是我的代码：package me.findTax;/**   Notes:*       Fix the location of all the elements and create the math part of the program**       For some reason, takes eclipse a long time on home & school computers to run this program, not entirely sure why (2+ min)**       If something is not working, try looking a make sure that the change method is called after everytime that the getQuestion method is called*/import javax.swing.*;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.util.ArrayList;public class Main { //gives questions (source not included, keylistener included (currently not working), actionlistener included)static JRadioButton b1;static JRadioButton b2;static JFrame frame;static JPanel panel;static JLabel L1;static JLabel L2;static JTextField tfield;static ButtonGroup bg = new ButtonGroup();static JButton B1;static double tax;static boolean married;static ArrayList<String> poss_Questions = new ArrayList<String>();private static int q;// Only need 2 buttons because there is only one prompt (yes or no)public static void change() {    if(q == 1) {        b1.setVisible(false);        b2.setVisible(false);        tfield.setVisible(true);        B1.setVisible(true);    } else if(q == 2) {        tfield.setVisible(false);        B1.setVisible(false);        L2.setText(Double.toString(tax)); //fix to make output more good        L2.setVisible(true);        L1.setLocation(10,20);    }}public static String getQuestion(){    String question = "";    if(q == 0){        question = poss_Questions.get(q);    } else if(q == 1){        question = poss_Questions.get(q);    } else if(q == 2){        doMath();        question = poss_Questions.get(q);    }

Answer 1

我实际上键入了您的程序。

问：Eclipse 程序是否需要三分钟或更长时间才能启动？

答：不，除非你有一台VERRRY慢速计算机，或者你已经超过了RAM并且你正在达到交换。

问：您的程序在“看到某些内容”之前是否需要长达三分钟的时间？

答：是的。

建议：

在“main（）”中设置一个断点，然后按“F6”一次单步执行一行（和/或按“F5”单步执行要检查的函数）。

提示：您的程序应该会迅速启动，事情会很快发生...直到您点击“getQuestion（）”;)

强烈建议：

“编程”的一个重要部分是学习如何进行故障排除和调试。这是一个很好的机会，可以熟悉如何使用 Eclipse 调试器来单步执行代码。

Answer 2

该程序会进入一个“无限”循环。如果你在上一个循环中查看 getQuestion（）：

if (L1.getText().length() < 16) {

   for (int z = 16; z > L1.getText().length(); z++) {

            L1.setLocation(L1.getX() + 1, L1.getY());

   }

当 L1.getText（）.length（） < 16 时，此循环从 16 开始，因此 z > L1.getText（）.length（） 根据定义是正确的。

当 z 随着每个循环递增而递增时，z 会变得更大，甚至会更符合条件。所以它是无休止地增加的。好吧，不是无休止的 - 当它变得足够大时，它会溢出并变成负面的。这是它停止的时候。

在下面的代码中，我将增量替换为 z 的递减。虽然我不知道它是否在逻辑上是你想要的 - 它消除了无限循环，程序来得更快。通过显示此错误导致您的问题：

import javax.swing.*;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.ArrayList;

public class Main { //gives questions (source not included, keylistener included (currently not working), actionlistener included)

    static JRadioButton b1;

    static JRadioButton b2;

    static JFrame frame;

    static JPanel panel;

    static JLabel L1;

    static JLabel L2;

    static JTextField tfield;

    static ButtonGroup bg = new ButtonGroup();

    static JButton B1;

    static double tax;

    static boolean married;

    static ArrayList<String> poss_Questions = new ArrayList<String>();

    private static int q=0;

// Only need 2 buttons because there is only one prompt (yes or no)

    public static String getQuestion() {

        String question = "";

        if (q == 0) {

            question = poss_Questions.get(q);

        } else if (q == 1) {

            question = poss_Questions.get(q);

            b1.setVisible(false);

            b2.setVisible(false);

            tfield.setVisible(true);

            B1.setVisible(true);

        } else if (q == 2) {

            doMath();

            question = poss_Questions.get(q);

            tfield.setVisible(false);

            B1.setVisible(false);

            L2.setText(Double.toString(tax)); //fix to make output more good

            L2.setVisible(true);

        }

        q++;

        L1.setLocation(190, 20);

        if (L1.getText().length() > 16) {

            for (int t = 16; t < L1.getText().length(); t++) {

                L1.setLocation(L1.getX() - 1, L1.getY());

            }

        }

        if (L1.getText().length() < 16) {

            for (int z = 16; z > L1.getText().length(); z--) {

                L1.setLocation(L1.getX() + 1, L1.getY());

            }

        }

        return question;

    }

    public static void checkAnswer() {

        if (L1.getText().equals(poss_Questions.get(0))) {

            if (b1.isSelected()) {

                married = true;

            } else if (b2.isSelected()) {

                married = false;

            }

        }

    }

    static int num;

    public static void doMath() {

        if (married) {

            try {

                num = Integer.parseInt(tfield.getText());

            } catch (NumberFormatException e) {

                JOptionPane.showMessageDialog(null, "Please enter a whole number above zero without decimal points, commas", "ERROR", JOptionPane.ERROR_MESSAGE);

                //may work

            }

            if (num > 0 && num <= 16000) {

                tax = num * 0.10; // 10%

            } else if (num > 16000 && num <= 64000) {

                tax = (1600 + (0.15 * (num - 16000)));

            } else if (num > 64000) {

                tax = (8800 + (0.25 * (num - 64000)));

            } else {

                JOptionPane.showMessageDialog(null, "Please enter a value greater than 0, without decimal points, and not in a string format", "Invalid Entry", JOptionPane.ERROR_MESSAGE);

            }

        } else if (!married) { //if single

            try {

                num = Integer.parseInt(tfield.getText());

            } catch (NumberFormatException e) {

                JOptionPane.showMessageDialog(null, "Please enter a whole number above zero without decimal points, commas", "ERROR", JOptionPane.ERROR_MESSAGE);

            }

            //use else if loops and else (else prints out that there was an error)

            if (num > 0 && num <= 8000) {

                tax = num * 0.10; // 10%

            } else if (num > 8000 && num <= 32000) {

                tax = (800 + (0.15 * (num - 8000)));

            } else if (num > 32000) {

                tax = (4400 + (0.25 * (num - 32000)));

            } else {

                JOptionPane.showMessageDialog(null, "Please enter a value greater than 0, without decimal points, and not in a string format", "Invalid Entry", JOptionPane.ERROR_MESSAGE);

            }

        }

    }

    public static void main(String args[]) {

        poss_Questions.add("Are you married?");

        poss_Questions.add("How much do you make? ($$ per year)");

        poss_Questions.add("Here is how much tax will be taken away");

        b1 = new JRadioButton();

        b1.setText("Yes");

        b2 = new JRadioButton();

        b2.setText("No");

        b1.setVisible(true);

        b2.setVisible(true);

        b1.setBounds(75, 150, 200, 30);

        b2.setBounds(300, 150, 200, 30);

        bg.add(b1);

        bg.add(b2);

        B1 = new JButton();

        B1.setText("Submit");

        B1.setVisible(true);

        B1.setLocation(340, 50);

        B1.setSize(75, 25);

        B1.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {

                checkAnswer();

                L1.setText(getQuestion());

            }

        });

        tfield = new JTextField();

        tfield.setVisible(false);

        tfield.setBounds(100, 50, 200, 20);

        L1 = new JLabel();

        L1.setText(getQuestion());

        L1.setSize(400, 20);

        L1.setLocation(10, 20);

        L2 = new JLabel();

        L2.setVisible(false);

        L2.setSize(400, 20);

        L2.setLocation(10, 60);

        L2.setText("Something went wrong");

        JOptionPane.showMessageDialog(null, L2.getX() + " " + L2.getY());

        panel = new JPanel();

        panel.setVisible(true);

        frame = new JFrame();

        frame.setVisible(true);

        frame.add(panel);

        frame.setSize(new Dimension(480, 270));

        frame.setResizable(false);

        panel.add(b1);

        panel.add(b2);

        panel.add(B1);

        panel.add(L1);

        panel.add(tfield);

        panel.add(L2);

        panel.setLayout(null);

    }

}