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我已经阅读了关于如何使用DocumentListener的许多线程，但是我的代码拒绝工作。基本上我制作了一台食品计算器，所以当第一个JTextField中插入食品时，它会计算出每克x所需产品的所有食品价值。如何在java中添加更新的JTextfield值？ [DocumentListener]
底部有一个JTextfield，我想用它存储所消耗的所有产品的kcal值的总和。 因此，简而言之，无论何时您更改产品并按下输入键，它都会改变kcal值，因此我需要所有产品的总和。
这里是它如何工作的一个简单的图片：
请，如果你知道，请告诉我，我在这工作了太多的时间。 只需要为我按下的每个产品添加JTextfield输入。
package Grafika;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.EventObject;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
public class Food_Calculator {
public static final String[] FOOD_NAME = { "Jogurt, sadni", "Jogurt 1,6%",
"Smetana, sladka 30%", "Sir,sveži", "Sir, mozzarella",
"Sir, ovčji", "Sir, parmezan", "Sirotka", "Brokoli", "Buče",
"Čebula, bela", "Čebula, rdeča", "Česen", "Endivija",
"Fižol, sveži", "Gobe, sveže", "Grah", "Jajčevec", "Krompir",
"Kumare, sveže", "Kumarice, kisle", "Motovilec", "Paprika, rumena",
"Paprika, zelena", "Paradižnik", "Pesa, kuhana", "Peteršilj",
"Por", "Rabarbara", "Radič, rdeči", "Radič, zeleni",
"Solata, zelena", "Špinača", "Zelena", "Zelje, glavnato belo",
"Zelje, glavnato rdeče", "Zelje, kitajsko", "Ananas", "Avokado",
"Banana", "Borovnice", "Breskev", "Brusnice", "Češnje", "Fige",
"Grenivka", "Grozdje, belo", "Grozdje, črno", "Hruška (cela)",
"Jabolko (celo)", "Jagode", "Kivi", "Kokos", "Lešniki, suhi",
"Limona", "Lubenica", "Mandarina", "Mandlji", "Maline", "Marelica",
"Nektarina", "Olive, zrele", "Orehi, suhi", "Pomaranča",
"Ribez, črni", "Ribez, rdeči", "Robide", "Rozine", "Slive",
"Šipek, suhi", "Višnje", "Goska, cela", "Kokoš, cela",
"Konjsko meso", "Piščanec, cel", "Piščanec, belo meso",
"Piščanec, temno meso", "Pršut", "Puran, cel", "Puran, belo meso",
"Puran, temno meso", "Raca, cela", "Svinjina, nemastna",
"Teletina, nemastna", "Vratovina, sušena", "Hobotnica", "Lignji",
"List", "Losos", "Postrv, potočna", "Sardelice", "Tuna",
"Tunina v olju", "Ajda", "Koruzni kosmiči", "Kruh, pšenični, črni",
"Ovseni kosmiči", "Prepečenec, beli", "Pšenična moka, bela",
"Pšenični otrobi", "Pšenica, suho zrnje", "Riž, neglaziran",
"Riž, glaziran", "Riževa moka", "Rž", "Borovničev sok",
"Breskov sok", "Cola", "Čaj, indijski", "Grozdni sok",
"Hruškov sok", "Jabolčni sok", "Kava", "Marelični sok",
"Pesin sok", "Pomarančni sok, sveži", "Čokolada, jedilna",
"Čokolada, mlečna", "Čokolada, mlečna, z lešniki", "Med" };
public static final double[] FOOD_VALUES = { 99.0, 43.0, 284.9, 95.0,
224.0, 447.0, 411.0, 25.9, 25.0, 15.0, 35.0, 23.0, 136.0, 11.0,
143.0, 35.9, 67.0, 25.0, 87.0, 14.0, 10.0, 20.0, 22.0, 16.0, 14.0,
32.0, 20.0, 28.0, 12.0, 12.0, 24.0, 15.1, 21.9, 12.0, 22.0, 20.0,
12.0, 46.0, 126.0, 79.0, 56.0, 37.0, 45.7, 48.0, 41.0, 28.0, 60.0,
54.0, 29.0, 40.0, 26.0, 40.0, 346.0, 701.0, 26.9, 21.0, 34.0,
565.0, 25.0, 50.7, 50.0, 128.5, 648.0, 35.0, 28.0, 21.0, 29.0,
246.0, 56.6, 169.2, 57.8, 198.0, 186.0, 110.0, 230.0, 116.0, 126.0,
496.0, 143.0, 134.0, 186.0, 341.0, 161.0, 113.0, 450.0, 73.0, 77.0,
83.0, 217.0, 86.0, 98.0, 225.0, 287.0, 333.7, 368.0, 222.0, 372.0,
354.0, 350.0, 206.0, 326.0, 329.0, 349.0, 349.0, 347.5, 45.0, 48.0,
39.0, 57.8, 65.7, 51.9, 49.7, 301.0, 56.6, 36.0, 45.0, 475.0,
517.9, 529.8, 302.7 };
public static final double[] FOOD_VALUES_OH = { 18.6, 3.9, 1.0, 3.0, 0.0,
0.0, 2.0, 5.1, 2.5, 3.4, 8.5, 5.2, 28.0, 1.1, 21.8, 5.8, 10.6, 5.6,
20.8, 1.8, 2.0, 3.0, 5.0, 2.8, 2.8, 7.0, 1.0, 5.0, 2.0, 1.7, 3.2,
2.8, 3.9, 2.0, 3.8, 3.5, 2.0, 11.6, 7.0, 19.2, 14.3, 9.1, 10.8,
11.7, 9.5, 7.0, 15.3, 13.5, 7.6, 10.0, 6.2, 9.0, 3.7, 6.0, 8.2,
5.3, 8.0, 4.3, 5.6, 12.8, 12.4, 2.6, 8.8, 5.8, 6.6, 4.4, 6.4, 64.4,
14.6, 79.2, 14.3, 0.0, 0.2, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
0.0, 0.0, 0.0, 1.1, 0.8, 1.0, 0.9, 0.0, 0.0, 0.0, 0.0, 0.0, 72.9,
85.1, 43.0, 72.8, 77.5, 80.1, 26.8, 72.0, 72.0, 78.0, 78.0, 74.0,
11.1, 11.7, 10.0, 0.0, 16.6, 3.2, 13.8, 28.5, 14.6, 8.0, 10.4,
46.8, 56.9, 51.3, 82.3 };
public static final double[] FOOD_VALUES_P = { 1.0, 3.3, 22.0, 14.0, 19.9,
25.6, 40.0, 0.9, 3.0, 0.6, 0.9, 0.9, 6.0, 0.9, 10.1, 2.8, 5.8, 1.2,
2.1, 0.7, 0.5, 2.0, 0.2, 0.9, 0.9, 1.1, 4.0, 2.0, 1.0, 1.2, 1.8,
1.3, 2.2, 1.0, 1.9, 1.7, 1.0, 0.5, 2.0, 1.1, 0.6, 0.6, 0.4, 0.8,
1.3, 0.0, 0.6, 0.5, 0.2, 0.0, 0.6, 1.0, 3.2, 14.0, 1.1, 0.4, 0.9,
16.9, 0.9, 1.0, 0.9, 1.1, 15.8, 0.9, 0.9, 1.1, 1.3, 1.1, 0.7, 4.5,
1.2, 21.8, 21.5, 20.9, 17.6, 21.8, 19.1, 18.9, 20.0, 22.0, 20.9,
20.0, 20.0, 21.3, 20.8, 15.3, 16.0, 15.9, 22.5, 14.7, 17.4, 21.5,
22.8, 11.7, 8.6, 8.0, 8.0, 11.6, 9.8, 14.1, 10.2, 7.0, 7.0, 7.0,
9.3, 0.1, 0.3, 0.0, 14.1, 0.2, 0.3, 0.1, 12.5, 0.3, 1.0, 0.7, 7.9,
7.7, 9.3, 0.3 };
public static final double[] FOOD_VALUES_M = { 1.1, 1.6, 30.0, 3.0, 16.1,
40.0, 27.0, 0.3, 0.4, 0.0, 0.0, 0.0, 0.0, 0.3, 1.5, 0.5, 0.4, 0.2,
0.1, 0.5, 0.2, 0.0, 0.3, 0.0, 0.0, 0.1, 0.0, 0.0, 0.0, 0.0, 0.5,
0.2, 0.3, 0.0, 0.1, 0.1, 0.0, 0.0, 10.0, 0.3, 0.6, 0.0, 0.7, 0.1,
0.0, 0.0, 0.0, 0.1, 0.0, 0.0, 0.0, 0.0, 36.0, 69.0, 0.3, 0.0, 0.0,
53.5, 0.0, 0.2, 0.0, 13.8, 61.4, 0.0, 0.0, 0.0, 0.0, 0.0, 0.2, 1.5,
0.3, 12.3, 11.0, 2.8, 17.7, 3.2, 5.5, 46.9, 7.0, 2.0, 11.2, 29.0,
9.0, 3.1, 40.2, 0.8, 1.0, 1.7, 13.4, 3.0, 3.2, 15.5, 22.0, 2.4,
1.6, 2.0, 7.5, 1.9, 1.2, 5.5, 2.0, 2.0, 1.0, 1.0, 1.8, 0.0, 0.0,
0.0, 0.0, 0.0, 0.2, 0.0, 15.4, 0.1, 0.0, 0.2, 39.7, 32.3, 35.6, 0.0 };
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JPanel plosca = new MainPanel();
GraficnoOgrodje.ustvariOkno(
"Kalkulator Hranilnih Vrednosti v1.0", plosca, false);
}
});
}
private static class MainPanel extends JPanel implements ActionListener {
private JButton enter;
private JTextField calculations, food_field, value2, value3, value4,
value5, grams, total1;
private JLabel food, food_field_entered, kcal, value1, OH, P, FATT,
blank, blank1, blank2, portion, total;
public MainPanel() {
setLayout(new BorderLayout());
// First panel on Main panel
JPanel PanelOne = new JPanel();
this.add(PanelOne, BorderLayout.NORTH);
PanelOne.setBackground(Color.lightGray);
PanelOne.setLayout(new FlowLayout());
food = new JLabel();
food.setText("Insert food type: ");
portion = new JLabel(" insert a portion in grams (g): ");
grams = new JTextField(10);
food_field = new JTextField(10);
food_field.setEditable(true);
enter = new JButton("Enter");
PanelOne.add(food);
PanelOne.add(food_field);
PanelOne.add(portion);
PanelOne.add(grams);
PanelOne.add(enter);
// Second Panel on Main panel
JPanel PanelTwo = new JPanel();
this.add(PanelTwo, BorderLayout.CENTER);
Dimension two = new Dimension(500, 150);
PanelTwo.setPreferredSize(two);
PanelTwo.setLayout(new GridLayout(3, 8, 0, 10));
food_field_entered = new JLabel(" Food: ");
value1 = new JLabel();
blank = new JLabel();
blank1 = new JLabel();
kcal = new JLabel(" Kcal: ");
value2 = new JTextField(10);
OH = new JLabel(" OH: ");
value3 = new JTextField(10);
P = new JLabel(" Proteins: ");
value4 = new JTextField(10);
FATT = new JLabel(" Fatt: ");
value5 = new JTextField(10);
PanelTwo.add(food_field_entered);
PanelTwo.add(value1);
PanelTwo.add(blank);
PanelTwo.add(blank1);
PanelTwo.add(kcal);
PanelTwo.add(value2);
PanelTwo.add(OH);
PanelTwo.add(value3);
PanelTwo.add(P);
PanelTwo.add(value4);
PanelTwo.add(FATT);
PanelTwo.add(value5);
// Third Panel on Main panel
JPanel PanelThree = new JPanel();
this.add(PanelThree, BorderLayout.SOUTH);
PanelThree.setBackground(Color.lightGray);
PanelThree.setLayout(new FlowLayout());
Dimension three = new Dimension(getWidth(), 30);
PanelThree.setPreferredSize(three);
total = new JLabel("You consumed: ");
total1 = new JTextField(10);
total1.setEditable(true);
PanelThree.add(total);
PanelThree.add(total1);
// Fourth Panel on Main panel
JPanel PanelFour = new JPanel();
this.add(PanelFour, BorderLayout.EAST);
PanelFour.setPreferredSize(new Dimension(5, getHeight()
- PanelThree.getHeight()));
// Fifth Panel on Main panel
JPanel PanelFive = new JPanel();
this.add(PanelFive, BorderLayout.WEST);
PanelFive.setBackground(Color.lightGray);
PanelFive.setPreferredSize(new Dimension(0, getHeight()
- PanelThree.getHeight()));
// adding ActionListener to the MainPanel, for the button
enter.addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if (source == enter) {
String foodText = food_field.getText();
String gramsText = grams.getText();
double grams2 = Double.parseDouble(grams.getText());
value1.setText("[ " + foodText + "/" + gramsText
+ " gramov ]");
// calculations of food values for x grams...
double kcal1 = 0.0;
double oh = 0.0;
double protein = 0.0;
double fatt = 0.0;
for (int i = 0; i < FOOD_NAME.length; i++) {
if (foodText.equals(FOOD_NAME[i])) {
kcal1 = grams2/100 * FOOD_VALUES[i];
oh = grams2/100 * FOOD_VALUES_OH[i];
protein = grams2/100 * FOOD_VALUES_P[i];
fatt = grams2/100 * FOOD_VALUES_M[i];
}
}
value2.setText(String.format(" %.1f ", kcal1));
value3.setText(String.format(" %.1f g", oh));
value4.setText(String.format(" %.1f g", protein));
value5.setText(String.format(" %.1f g", fatt));
}
value2.getDocument().addDocumentListener(new DocumentListener() {
@Override
public void changedUpdate(DocumentEvent e) {
// TODO Auto-generated method stub
warn();
}
@Override
public void insertUpdate(DocumentEvent e) {
// TODO Auto-generated method stub
warn();
}
@Override
public void removeUpdate(DocumentEvent e) {
// TODO Auto-generated method stub
warn();
}
public void warn() {
double total = 0.0;
double kcal1 = Double.parseDouble(value2.getText());
total = kcal1 + total;
total1.setText(String.format(" %.1f Kcal", total));
}
});
}
}
}
不，你明白我错了。我想将不同产品的相同JTextfield（value2，更具体）的所有数字相加，这意味着，每次按Enter键时，都会将+ x Kcall添加到第一个Kcall值，依此类推... 例子：Youghurt有200大卡，所以当按下时总共1个JTextfield将会是200，当我再次按下输入时它会加上+200，所以total1将会是400.如果我输入另一个产品，比如鸡，它会添加总数为1的总共有300个，所以总共3个动作总共为700千卡。 因此，现在让我们只针对value2 Textfield – Hiti3
@ user2667643 x值从哪里来？例如，它储存在哪里，酸奶有200大卡？因为修改上面的代码来考虑这一点相当容易。例如，每当输入被按下时，诸如'value2.setText（Double.parseDouble（value2.getText（））+ 200）'这样的行就会简单地将value2递增200。显然它必须是动态的（200酸奶，其他食品的其他价值），这就是为什么我问你在哪里得到酸奶有200千卡。 – asaini007
如果你看我的代码，你可以看到5个二维数组，第一个代表食物名称（它是斯洛文尼亚语），第二个是kcal值，第三个，哦，第四个蛋白质和最后一个胖值。之后，我根据在第一个JTextfield中输入的产品进行计算，它会搜索数组中的名称和所有值，并计算每克特定的给定值。您不能只是动态地改变并添加额外的金额，因为代码中存储了很多产品。那么我需要文档监听器还是什么？ – Hiti3