[英]How to get the value(int) from a For Loop inside a Action Listener class to use in my main class?
我已經在主類之外聲明了一個全局變量（ int number ）：
public class BingoGUI {
private static Random thing = new Random();
public static int number = 0;
public static void main(String args[]) {
然后，我需要在動作偵聽器類中為我創建的Jbutton使用變量number ：
public static class theNextCall implements ActionListener {
public void actionPerformed(ActionEvent e) {
number = thing.nextInt(75) + 1;
if (number < 16) {
currentCall = "B" + number;
} else if (15 < number && number < 31) {
currentCall = "I" + number;
} else if (30 < number && number < 46) {
currentCall = "N" + number;
} else if (45 < number && number < 61) {
currentCall = "G" + number;
} else {
currentCall = "O" + number;
}
call.setText("the current call is: " + currentCall);
}
}
目的是每次單擊按鈕（具有theNextCall操作偵聽器）時，如果主類中的number等於i ，則callButton[i]會將背景顏色更改為黃色。 但是由於某種原因，我無法從Action Listener類中訪問number ，所以主類中的number一直得到我在開始時聲明的初始值0。
在我的主要班級中：
public static void main(String args[]){
for (int i = 1; i < 76; i++) {
callButton[i] = new JButton(Integer.toString(i));
callButton[i].setFont(new Font(Integer.toString(i), Font.BOLD, 9));
callButton[i].setForeground(Color.BLUE);
callButton[i].setBackground(Color.WHITE);
if (i == number){
callButton[i].setBackground(Color.YELLOW);
}
callBoard.add(callButton[i]);
}
如果您需要參考，這是我的完整代碼（未完成的賓果游戲gui）：
import java.util.Random;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import com.sun.speech.freetts.Voice;
import com.sun.speech.freetts.VoiceManager;
public class BingoGUI {
private static int d = 0;
//options panel
private static String currentCall = "";
private static JLabel call = new JLabel("");
private static JButton nextCall = new JButton("Next call");
private static JButton bingo = new JButton ("Call Bingo!");
private static Random thing = new Random();
public static int number = 0;
private static JButton[] callButton = new JButton[76];
//playerCard
private static int[] number2 = new int[76];
private static JButton[] playerButton = new JButton[51];
//cpuCard
private static int number3 = 0;
private static JButton[] cpuNum = new JButton[51];
private static JPanel playerCard = new JPanel();
//voice
private static Voice v;
private static VoiceManager vm = VoiceManager.getInstance();
public static void main(String args[]){
JFrame frame = new JFrame("BINGO!");
JPanel mainPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
JPanel callBoard = new JPanel();
JPanel cpuCard = new JPanel();
JPanel options = new JPanel();
JLabel test = new JLabel("");
frame.setVisible(true);
frame.setResizable(false);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(1000,800);
mainPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
//callBoard layout
for (int i = 1; i < 76; i++) {
callButton[i] = new JButton(Integer.toString(i));
callButton[i].setFont(new Font(Integer.toString(i), Font.BOLD, 9));
callButton[i].setForeground(Color.BLUE);
callButton[i].setBackground(Color.WHITE);
if (i == number){
callButton[i].setBackground(Color.YELLOW);
}
callBoard.add(callButton[i]);
}
//playerCard layout
for (int a = 1; a < 51; a++) {
if (a == 1 || a == 11 || a == 21 || a == 31 || a == 41 || a == 6 || a == 16 || a == 26 || a == 36 || a == 46){
number2[a] = 1+thing.nextInt(15);
} else if (a == 2 || a == 12 || a == 22 || a == 32 || a == 42 || a == 7 || a == 17 || a == 27 || a == 37 || a == 47) {
number2[a] = 16+thing.nextInt(15);
} else if (a == 3 || a == 13 || a == 23 || a == 33 || a == 43 || a == 8 || a == 18 || a == 28 || a == 38 || a == 48) {
number2[a] = 31+thing.nextInt(15);
} else if (a == 4 || a == 14 || a == 24 || a == 34 || a == 44 || a == 9 || a == 19 || a == 29 || a == 39 || a == 49) {
number2[a] = 46+thing.nextInt(15);
} else {
number2[a] = 61+thing.nextInt(15);
}
playerButton[a] = new JButton(Integer.toString(number2[a]));
playerButton[a].setFont(new Font(Integer.toString(a), Font.BOLD, 9));
playerButton[a].addActionListener(new daub());
playerButton[a].setBackground(Color.WHITE);
if (a == 23 || a == 28) {
playerButton[a] = new JButton("");
playerButton[a].setBackground(Color.RED);
}
playerCard.add(playerButton[a]);
if (a == 5 || a == 15 || a == 25 || a == 35 || a == 45){
playerCard.add(Box.createRigidArea(new Dimension(10, 0)));
}
}
//loop for random number in cpuCard
for (int b = 1; b < 51; b++) {
if (b == 1 || b == 11 || b == 21 || b == 31 || b == 41 || b == 16 || b == 26 || b == 36 || b == 46){
number3 = 1+thing.nextInt(15);
} else if (b == 2 || b == 12 || b == 22 || b == 32 || b == 42 || b == 7 || b == 17 || b == 27 || b == 37 || b == 47) {
number3 = 16+thing.nextInt(15);
} else if (b == 3 || b == 13 || b == 23 || b == 33 || b == 43 || b == 8 || b == 18 || b == 28 || b == 38 || b == 48) {
number3 = 31+thing.nextInt(15);
} else if (b == 4 || b == 14 || b == 24 || b == 34 || b == 44 || b == 9 || b == 19 || b == 29 || b == 39 || b == 49) {
number3 = 46+thing.nextInt(15);
} else {
number3 = 61+thing.nextInt(15);
}
cpuNum[b] = new JButton(Integer.toString(number3));
cpuNum[b].setFont(new Font(Integer.toString(b), Font.BOLD, 9));
cpuNum[b].setBackground(Color.WHITE);
if (b == 23 || b == 28) {
cpuNum[b] = new JButton("");
cpuNum[b].setBackground(Color.BLUE);
}
if (number3 == number){
cpuNum[b].setBackground(Color.BLUE);
}
cpuCard.add(cpuNum[b]);
if (b == 5 || b == 15 || b == 25 || b == 35 || b == 45){
cpuCard.add(Box.createRigidArea(new Dimension(10, 0)));
}
}
callBoard.setLayout(new GridLayout(5,15));
playerCard.setLayout(new GridLayout(5,10));
cpuCard.setLayout(new GridLayout(5,10));
callBoard.setPreferredSize(new Dimension(700, 250));
playerCard.setPreferredSize(new Dimension(500, 250));
cpuCard.setPreferredSize(new Dimension(500,250));
options.add(test);
options.add(call);
nextCall.addActionListener(new theNextCall());
options.add(nextCall);
options.add(bingo);
mainPanel.add(callBoard);
mainPanel.add(cpuCard);
mainPanel.add(Box.createRigidArea(new Dimension(100, 0)));
mainPanel.add(playerCard);
mainPanel.add(options);
mainPanel.setPreferredSize(new Dimension(1200, 600));
frame.setContentPane(mainPanel);
frame.pack();
}
public static class theNextCall implements ActionListener {
public void actionPerformed(ActionEvent e) {
v = vm.getVoice("kevin16");
number = thing.nextInt(75) + 1;
if (number < 16) {
currentCall = "B" + number;
} else if (15 < number && number < 31) {
currentCall = "I" + number;
} else if (30 < number && number < 46) {
currentCall = "N" + number;
} else if (45 < number && number < 61) {
currentCall = "G" + number;
} else {
currentCall = "O" + number;
}
call.setText("the current call is: " + currentCall);
v.allocate();
v.speak(currentCall);
}
}
private static class daub implements ActionListener {
public void actionPerformed(ActionEvent e) {
JButton daub = (JButton)e.getSource();
daub.setBackground(Color.RED);
}
}
}
if (i == number){
callButton[i].setBackground(Color.YELLOW);
}
在您的for循環中，應該設置顏色。 但是，如果i等於數字，例如i為2，則將背景設置為黃色后，循環將繼續並重置背景顏色。 如果條件為真，則可能要break 。
然后，在ActionListener ：也許您想要一個方法來檢查數字並在條件為true時設置背景。
當您啟動程序時， main的代碼（包含上述語句的for循環）僅運行一次（我想那是您要檢查number並設置顏色的部分）。
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