项目在eclipse中运行多长时间？ **固定**

问题描述 投票：0回答：2

好的，我在我的学校有一个计算机科学项目。该项目旨在创建一个GUI，计算应该对人员收入征税多少。我遇到的问题是，每次我想运行程序实际启动时需要3分钟。包括我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);
    }
    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");

    System.err.println("1");

    b1 = new JRadioButton();
    b1.setText("Yes");
    b2 = new JRadioButton();
    b2.setText("No");

    System.err.println("2");

    b1.setVisible(true);
    b2.setVisible(true);
    b1.setBounds(75, 150, 200, 30);
    b2.setBounds(300, 150, 200, 30);

    System.err.println("3");

    bg.add(b1);
    bg.add(b2);

    System.err.println("4");

    B1 = new JButton();
    B1.setText("Submit");
    B1.setVisible(true);
    B1.setLocation(250, 50); 
    B1.setSize(75, 25); 
    B1.addActionListener(new ActionListener() { 
          public void actionPerformed(ActionEvent e) { 
            checkAnswer();
            L1.setText(getQuestion());
            change();
          } 
    });

    System.err.println("5");

    tfield = new JTextField();
    tfield.setVisible(false);
    tfield.setBounds(10, 50, 200, 20);

    System.err.println("6"); //last output on console until program runs

    L1 = new JLabel();
    L1.setText(getQuestion());
    change();
    L1.setSize(400, 20);
    L1.setLocation(10, 20);

    System.err.println("7");

    L2 = new JLabel();
    L2.setVisible(false);
    L2.setSize(400, 20);
    L2.setLocation(10, 60);
    L2.setText("Something went wrong");

    System.err.println("8");

    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);

    System.err.println("9");

    panel.add(b1);
    panel.add(b2);
    panel.add(B1);
    panel.add(L1);
    panel.add(tfield);
    panel.add(L2);

    panel.setLayout(null);

    System.err.println("All");
}

}

在我脑海中产生的主要问题是为什么需要这么长时间。文件本身只有大约6kb，我觉得它很小，不应该花那么长的时间来运行。我已经尝试将文件从USB移动到桌面，尝试了不同的计算机，没有工作。也许我的代码布局？

我已经做了一些研究，非论坛或教程网站已经说了类似这个问题的任何东西。

先感谢您

java eclipse jframe jpanel
2个回答
1
投票

该程序进入一个“无休止”的循环。如果你在最后一个循环中查看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因此z> L1.getText（）时，此循环以16开始。根据定义，length（）为true。

当z增加时，每个循环z变得更大，甚至更符合条件。所以它无休止地增加。好吧不是无休止地 - 当它变得足够大时它会溢出并变为负面。这是它何时停止。

在下面的代码中，我用增量z替换了增量。虽然我不知道它在逻辑上是否符合您的要求 - 它会消除无限循环并且程序更快。通过这表明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);

    }
}
2
投票

我实际上键入了你的程序。

问：Eclipse程序需要三分钟或更长时间才能启动吗？

答：不，除非你有一台VERRRY慢速计算机，或者你已经超过内存并且你正在进行交换。

问：你的程序在“看到某些东西”之前需要花费三分钟吗？

答：是的。

建议：

在“main（）”中设置断点，然后点击“F6”一次单行一行（和/或“F5”进入要检查的函数）。

提示：你的程序应该及时启动，事情会很快...直到你点击“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，让您熟悉如何使用Eclipse调试器单步执行代码。

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