我正在制作一个模拟 NHL Draft Lottery 的程序,其中屏幕右侧应该有一个 JTextField,并且在左侧绘制了弹跳的选秀球。我创建了一个名为 Ball 的类,它实现了 Runnable,并在我的 DraftLottery 主类中作为线程运行。但是,当我的 draw 方法调用 repaint() 时,JTextArea 不显示。我尝试将 repaint() 切换为 revalidate(),但是球没有移动。然后我尝试调用 repaint() 和 revalidate(),但它的作用与 repaint() 相同。这是我的 DraftLottery 类的代码:
package ca.WiltzSports.DraftLottery;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import ca.WiltzSports.DraftLottery.DraftBall.Ball;
public class DraftLottery extends JFrame {
public static final long serialVersionUID = 89L;
int teams;
String[] teamNames;
int[] balls;
JTextArea display;
JPanel screen;
JPanel animation;
List<String> entries;
public static List<Ball> ball;
String [] draftOrder;
Random rand;
int counter = 1;
javax.swing.Timer t;
public static int width = 1024;
public static int height = 768;
Graphics dbg;
Image dbImage;
int i = 0;
public DraftLottery(int teams, String[] teamNames, int[] balls){
t = new javax.swing.Timer(2000, new ActionListener(){
@Override
public void actionPerformed(ActionEvent arg0) {
draft();
}
});
ball = new ArrayList<Ball>();
rand = new Random();
this.teams = teams;
this.teamNames = teamNames;
this.balls = balls;
this.screen = new JPanel();
this.animation = new JPanel();
display = new JTextArea(20,50);
display.setBackground(Color.BLACK);
display.setForeground(Color.YELLOW);
draftOrder = new String[teams];
this.entries = new ArrayList<String>();
addTeamBalls();
setSize(width,height);
setVisible(true);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setTitle("Draft Lottery");
setLayout(new BorderLayout());
screen.add(display);
add("East", new JScrollPane(display));
add("West", animation);
t.start();
}
@Override
public void paint(Graphics g){
dbImage = createImage(getWidth(), getHeight());
dbg = dbImage.getGraphics();
Graphics2D g2d = (Graphics2D) dbg;
draw(g2d);
g.drawImage(dbImage, 0, 0, this);
Ball.runBalls(ball);
}
public void draw(Graphics2D g2d){
for (Ball b: ball){
b.draw(g2d);
}
revalidate();
repaint();
}
public void addTeamBalls(){
for (int c = 0; c < teamNames.length; c++){
for (int j = 0; j < balls[c]; j++){
entries.add(teamNames[c]);
ball.add(new Ball(rand.nextInt(width/2 - Ball.SIZE), rand.nextInt(height - Ball.SIZE), teamNames[c], i++));
}
}
}
public void draft(){
int q = 0;
String [] e = entries.toArray(new String[entries.size()]);
String draftedTeam;
int index = rand.nextInt(entries.size());
draftedTeam = e[index];
if(!draftedTeam.equals("X")){
display.append("" + counter++ + ". " + draftedTeam + "\n");
for(int c = 0; c < e.length; c++){
if (e[c].equals(draftedTeam)){
e[c] = "X";
}
}
removeBalls();
}else {
boolean again = false;
for (int c = 0; c < e.length; c++){
if (!e[c].equals("X")){
again = true;
}
}
if(again){
}else{
t.stop();
display.append("DRAFT LOTTERY COMPLETE");
}
}
entries = Arrays.asList(e);
}
public void removeBalls(){
Ball [] bs;
int q = 0;
for (Ball b: ball){
if (b.getTeamName().equals("X")){
continue;
}else{
q++;
}
}
bs = new Ball[q];
q = 0;
for (Ball b: ball){
if (!b.getTeamName().equals("X")){
bs[q++] = b;
}
}
ball = Arrays.asList(bs);
}
}
任何帮助将不胜感激。非常感谢!