如何解决字符串不会使用 drawString()
我正在编写一个简单的琐事游戏，但遇到了问题字符串不显示的问题
在我的框架中，我使用边框布局，底部（南部）带有“新游戏”和“结束游戏”，中间是我的琐事面板。
琐事面板由 2 行 1 列的网格布局组成，下半部分和上半部分有 4 个答案我使用了另一个带有边框布局的面板，问题字符串在中心，分数在东。
它应该是这样的：
但是，除了问题字符串之外，所有组件都显示出来。 我的paintComponent是：
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setFont(font);
g.drawString(tf,0);
}
其中 tf 是我的字符串，我的琐事面板代码是：
public TriviaPanel(){
score = 0;
scoreString = new JTextField();
scoreString.setFont(font);
questionPanel = new JPanel();
questionPanel.setLayout(new BorderLayout());
questionPanel.add(scoreString,BorderLayout.EAST);
this.setLayout(new GridLayout(2,1));
pool = null;
try {
pool = new Pool();
} catch (FileNotFoundException e) {
e.printstacktrace();
}
question = pool.getQuestion();
String[] answers = question.shuffle();
tf = question.getQuestion();
this.add(questionPanel);
answersPanel = new JPanel();
answersPanel.setLayout(new GridLayout(2,2));
buttons = new JButton[NUM_OF_ANSWERS];
for (int i = 0; i < NUM_OF_ANSWERS; i++) {
buttons[i] = new JButton(answers[i]);
answersPanel.add(buttons[i]);
buttons[i].addActionListener(lis);
}
this.add(answersPanel);
scoreString.setText("score: "+score+"/"+pool.getIterator()*CORRECT);
}
pool 用于存放我的问题池。 当我调试代码时，我看到 tf 字符串被更新为问题字符串，但它不会显示。 是因为坐标吗？ 任何见解将不胜感激。
[编辑] 虽然未完成但完整代码如下：
import java.util.Arrays;
import java.util.Collections;
public class Question {
private final int NUM_OF_ANSWERS = 4;
private String question;
private String[] answers = new String[NUM_OF_ANSWERS];
private final int CORRECT_ANSWER = 0;
public Question(String qu,String an,String dm1,String dm2,String
dm3){
question = qu;
answers[0] = an;
answers[1] = dm1;
answers[2] = dm2;
answers[3] = dm3;
}
public String getCorrectAnswer() {
return answers[CORRECT_ANSWER];
}
public String getQuestion(){
return question;
}
public String[] getAnswers(){
return answers;
}
public String toString(){
String str = question;
for (int i = 0; i<4; i++)
str+=" "+answers[i];
str+="\n";
return str;
}
public String[] shuffle(){
String[] shuffled = new String[NUM_OF_ANSWERS];
for (int i=0;i<NUM_OF_ANSWERS;i++)
shuffled[i]=answers[i];
Collections.shuffle(Arrays.asList(shuffled));
return shuffled;
}
}
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Scanner;
public class Pool {
private ArrayList<Question> questions = new ArrayList<>();
private Scanner input = new Scanner(new File("src/trivia.txt"));
private static int iterator = 0;
public Pool() throws FileNotFoundException {
while (input.hasNext()){
String q = input.nextLine();
String a = input.nextLine();
String d1 = input.nextLine();
String d2 = input.nextLine();
String d3 = input.nextLine();
Question question = new Question(q,a,d1,d2,d3);
questions.add(question);
}
Collections.shuffle(questions);
//System.out.println(questions);
}
public Question getQuestion(){
Question q = questions.get(iterator);
iterator++;
return q;
}
public int getSize(){
return questions.size();
}
public static int getIterator() {
return iterator;
}
}
import javax.swing.*;
import java.awt.*;
public class GameFrame extends JFrame {
private JButton restart,finish;
private JPanel buttons;
public GameFrame(){
super("Trivia");
TriviaPanel tp = new TriviaPanel();
this.setLayout(new BorderLayout());
this.add(tp,BorderLayout.CENTER);
restart = new JButton("New game");
finish = new JButton("End game");
buttons = new JPanel();
buttons.add(restart);
buttons.add(finish);
this.add(buttons,BorderLayout.soUTH);
this.setSize(1000,600);
this.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
public static void main(String[] args) {
GameFrame gf = new GameFrame();
}
}
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.FileNotFoundException;
import java.util.concurrent.TimeUnit;
public class TriviaPanel extends JPanel {
private TimerListener tl = new TimerListener();
private Timer timer = new Timer(10000,tl);
private static int score;
private JTextField scoreString;
private final int CORRECT = 10,INCORRECT = 5;
private JButton[] buttons;
private Pool pool;
private Question question;
private JButton pressed;
private final int NUM_OF_ANSWERS = 4;
private Listener lis = new Listener();
//private JPanel questionPanel;
private JPanel answersPanel;
private String tf;
private Font font = new Font("Serif",Font.BOLD,24);
private JTextField tf2 = new JTextField();
private QuestionPanel questionPanel;
public TriviaPanel(){
score = 0;
scoreString = new JTextField();
scoreString.setFont(font);
questionPanel = new QuestionPanel();
//questionPanel.setLayout(new BorderLayout());
//questionPanel.add(scoreString,BorderLayout.EAST);
this.setLayout(new GridLayout(2,1));
pool = null;
try {
pool = new Pool();
} catch (FileNotFoundException e) {
e.printstacktrace();
}
question = pool.getQuestion();
String[] answers = question.shuffle();
tf = question.getQuestion();
//tf2.setText(question.getQuestion());
//questionPanel.add(tf2,BorderLayout.CENTER);
this.add(questionPanel);
answersPanel = new JPanel();
answersPanel.setLayout(new GridLayout(2,2));
buttons = new JButton[NUM_OF_ANSWERS];
for (int i = 0; i < NUM_OF_ANSWERS; i++) {
buttons[i] = new JButton(answers[i]);
answersPanel.add(buttons[i]);
buttons[i].addActionListener(lis);
}
this.add(answersPanel);
timer.start();
scoreString.setText("score: "+score+"/"+pool.getIterator()*CORRECT);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
questionPanel.repaint();
}
private void next(){
Question q = pool.getQuestion();
question=q;
tf = q.getQuestion();
String[] answers = q.shuffle();
for (int i = 0; i < NUM_OF_ANSWERS; i++)
buttons[i].setText(answers[i]);
}
private void gameOver(){
JOptionPane.showConfirmDialog(null,"score: "+score,"Select an Option...",JOptionPane.YES_NO_CANCEL_OPTION);
}
private void check(String guess) {
timer.stop();
String answer = question.getCorrectAnswer();
if (guess.equals(answer)) {
score += CORRECT;
tf = "Correct!!!";
} else {
score -= INCORRECT;
tf = "Wrong answer";
}
scoreString.setText("score: "+score+"/"+pool.getIterator()*CORRECT);
repaint();
try {
TimeUnit.SECONDS.sleep(1);
} catch (InterruptedException e) {
e.printstacktrace();
}
}
private class QuestionPanel extends JPanel{
public QuestionPanel(){
this.setLayout(new BorderLayout());
this.add(scoreString,BorderLayout.EAST);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setFont(font);
g.drawString(tf,200);
}
}
private class Listener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
pressed = (JButton) e.getSource();
String guess = pressed.getText();
check(guess);
if (pool.getIterator() < pool.getSize()) {
timer.restart();
next();
}
else
gameOver();
}
}
private class TimerListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
timer.stop();
score-=INCORRECT;
scoreString.setText("score: "+score+"/"+pool.getIterator()*CORRECT);
repaint();
timer.restart();
next();
}
}
}
解决方法
从摆脱开始
PascalCase说真的，这很危险，可能会让你陷入无限循环，这会消耗你的 CPU 周期
接下来，我修改了您的 address_form.instance.student = student，因此文本实际上呈现在概率范围内的某处......
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
questionPanel.repaint();
}
但是说真的，你为什么不直接使用 QuestionPanel？
现在，只要 private class QuestionPanel extends JPanel {
public QuestionPanel() {
this.setLayout(new BorderLayout());
this.add(scoreString,BorderLayout.EAST);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setFont(font);
FontMetrics fm = g.getFontMetrics();
int y = ((getHeight() - fm.getHeight()) / 2) + fm.getAscent();
g.drawString(tf,10,y);
}
}
发生变化，您都需要调用 JLabel 的 tf 方法。
所以，这在 QuestionPanel 和 repaint 方法中。
最后（就目前而言），你永远不应该做...
next在事件调度线程的上下文中。这是停止处理重绘，所以，一整秒，什么都不会改变。
如果您想暂时停止用户，请禁用按钮和/或其他控件并使用另一个 Swing check(String)（为简单起见）
这在这个自包含、可编译和可运行的示例中得到了演示...
try {
TimeUnit.SECONDS.sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
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