好吧，所以我在我的學校有一個計算機科學項目。該項目是創建一個GUI，用于計算應該對個人收入征收多少稅款。我遇到的問題是，每次我想運行程序時都需要3分鐘才能使程序實際啟動。包括我的老師在內的很多人都說這不正常。這是我的代碼：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); }
2 回答
jeck貓
TA貢獻1909條經驗 獲得超7個贊
我實際上鍵入了您的程序。
問：Eclipse 程序是否需要三分鐘或更長時間才能啟動？
答：不，除非你有一臺VERRRY慢速計算機，或者你已經超過了RAM并且你正在達到交換。
問：您的程序在“看到某些內容”之前是否需要長達三分鐘的時間？
答：是的。
建議：
在“main（）”中設置一個斷點，然后按“F6”一次單步執行一行（和/或按“F5”單步執行要檢查的函數）。
提示：您的程序應該會迅速啟動，事情會很快發生...直到您點擊“getQuestion（）”;)
強烈建議：
“編程”的一個重要部分是學習如何進行故障排除和調試。這是一個很好的機會，可以熟悉如何使用 Eclipse 調試器來單步執行代碼。
繁星淼淼
TA貢獻1775條經驗 獲得超11個贊
該程序會進入一個“無限”循環。如果你在上一個循環中查看 getQuestion（）：
if (L1.getText().length() < 16) {
for (int z = 16; z > L1.getText().length(); z++) {
L1.setLocation(L1.getX() + 1, L1.getY());
}
當 L1.getText（）.length（） < 16 時，此循環從 16 開始，因此 z > L1.getText（）.length（） 根據定義是正確的。
當 z 隨著每個循環遞增而遞增時，z 會變得更大，甚至會更符合條件。所以它是無休止地增加的。好吧，不是無休止的 - 當它變得足夠大時，它會溢出并變成負面的。這是它停止的時候。
在下面的代碼中，我將增量替換為 z 的遞減。雖然我不知道它是否在邏輯上是你想要的 - 它消除了無限循環，程序來得更快。通過顯示此錯誤導致您的問題：
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);
}
}
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