问题
//ADDING BET FIELDS
setLayout(null);
horseChoice = new JTextField();
horseChoice.setBounds(200, 585, 300, 20);
add(horseChoice);
setLayout(null);
horseBet = new JTextField();
horseBet.setBounds(200, 625, 300, 20);
add(horseBet);
//ADDING BET BUTTON
setLayout(null);
bet = new JButton("Place Bet");
bet.setBounds(250, 675, 200, 50);
add(bet);
I am trying to create two textfields where the users can type in what they want and a button to save their input to a variable. But when I run my program, the text fields and button flash and then become invisible. Then if the user clicks on them they flash again. How do I stop this from happening?
The rest of the class:
// the "main" function
public void run(){
init();
font = new Font ("Arial", Font.BOLD, 14);
titleFont = new Font ("Comic Sans MS", Font.BOLD, 20);
textColor = new Color(100, 100, 100);
resultColor = new Color(255, 165, 0, 180);
//ADDING HORSES
horse1 = new Horses_1();
horse2 = new Horses_2();
horse3 = new Horses_3();
horse4 = new Horses_4();
//GAMELOOP
while (running){
start = System.nanoTime();
elapsed = System.nanoTime() - start;
wait = targetTime - elapsed / 1000000;
try{
Thread.sleep(wait);
}
catch(Exception e){
e.printStackTrace();
}
//TIMER
if(horse1.h1x < 1350){
horse1Time++;
}
if(horse2.h2x < 1350){
horse2Time++;
}
if(horse3.h3x < 1350){
horse3Time++;
}
if(horse4.h4x < 1350){
horse4Time++;
}
//STOP RACING TIMERS
if(horse1Result == true && horse1.h1x >= 1350){
horse1TimeStr = horse1Time + ", Dominic";
horse1Result = false;
}
if(horse2Result == true && horse2.h2x >= 1350){
horse2TimeStr = horse2Time + ", Charlie";
horse2Result = false;
}
if(horse3Result == true && horse3.h3x >= 1350){
horse3TimeStr = horse3Time + ", Admiral";
horse3Result = false;
}
if(horse4Result == true && horse4.h4x >= 1350){
horse4TimeStr = horse4Time + ", Bacardi";
horse4Result = false;
}
//RANDOM HORSE CHOICE & MOVE PLACES
if(horse1.h1x >= 1350){
final int[] CHOICES = { 2,3,4 };
}
else if(horse2.h2x >= 1350){
final int[] CHOICES = { 1,3,4 };
}
else if(horse3.h3x >= 1350){
final int[] CHOICES = { 1,2,4 };
}
else if(horse4.h4x >= 1350){
final int[] CHOICES = { 1,2,3 };
}
else{
final int[] CHOICES = { 1,2,3,4 };
}
randomHorse = CHOICES[rand.nextInt(CHOICES.length)];
randomMove = rand.nextInt(35) + 1;
//PLACES
Update();
Draw();
drawToScreen();
}
}
// updates the game
private void Update() {
//UPDATE RACE COUNTER
if(horse1.h1x == 100 && horse2.h2x == 100 && horse3.h3x == 100 && horse4.h4x == 100){
races++;
}
//HORSE UPDATE
horse1.Update();
horse2.Update();
horse3.Update();
horse4.Update();
//RESULT SETTING
if(result == true && horse1Result == false && horse2Result == false && horse3Result == false && horse4Result == false){
String[] horses =
{ horse1TimeStr, horse2TimeStr, horse3TimeStr, horse4TimeStr };
Arrays.sort(horses);
firstHorse = horses[0];
secondHorse = horses[1];
thirdHorse = horses[2];
fourthHorse = horses[3];
firstHorse = firstHorse.replaceAll("[0-9,,]","");
secondHorse = secondHorse.replaceAll("[0-9,,]","");
thirdHorse = thirdHorse.replaceAll("[0-9,,]","");
fourthHorse = fourthHorse.replaceAll("[0-9,,]","");
result = false;
}
}
// draws the game onto an off-screen buffered image
private void Draw() {
//BACKGROUND COLOUR
g.setColor(Color.WHITE);
g.fillRect(0, 0, WIDTH, HEIGHT);
if(button == true){
//ADDING BET FIELDS
setLayout(null);
horseChoice = new JTextField();
horseChoice.setBounds(200, 585, 300, 20);
add(horseChoice);
setLayout(null);
horseBet = new JTextField();
horseBet.setBounds(200, 625, 300, 20);
add(horseBet);
//ADDING BET BUTTON
setLayout(null);
bet = new JButton("Place Bet");
bet.setBounds(250, 675, 200, 50);
add(bet);
button = false;
}
horse1.Draw(g);
horse2.Draw(g);
horse3.Draw(g);
horse4.Draw(g);
//HORSE 1 - TRACK
g.setColor(new Color (255, 0, 0));
g.drawLine(100, 125, WIDTH - 100, 125);
//HORSE 2 - TRACK
g.setColor(new Color (0, 255, 0));
g.drawLine(100, 225, WIDTH - 100, 225);
//HORSE 3 - TRACK
g.setColor(new Color (0, 0, 255));
g.drawLine(100, 325, WIDTH - 100, 325);
//HORSE 4 - TRACK
g.setColor(new Color (255, 255, 0));
g.drawLine(100, 425, WIDTH - 100, 425);
//FINISH LINE
g.setColor(new Color (255, 255, 0));
g.drawLine(WIDTH - 100, 475, WIDTH - 100, 375);
g.setColor(new Color (0, 0, 255));
g.drawLine(WIDTH - 100, 275, WIDTH - 100, 375);
g.setColor(new Color (0, 255, 0));
g.drawLine(WIDTH - 100, 175, WIDTH - 100, 275);
g.setColor(new Color (255, 0, 0));
g.drawLine(WIDTH - 100, 75, WIDTH - 100, 175);
//HUD
g.setColor(new Color (180, 180, 180));
g.drawLine(50, 550, WIDTH - 50, 550);
g.drawLine(550, 550, 550, 700);
g.drawLine(900, 550, 900, 700);
g.setColor(resultColor);
g.setFont(titleFont);
g.drawString("Results", 700, 540);
g.drawString("Details", 1000, 540);
g.drawString("Betting", 360, 540);
//Results
g.setColor(textColor);
g.setFont(font);
g.drawString("Winner : ", 600, 600);
g.drawString("Second : ", 600, 630);
g.drawString("Third : ", 600, 660);
g.drawString("Fourth : ", 600, 690);
//DETAILS
g.drawString("Race Number :", 950, 600);
g.drawString("Horse Choice :", 950, 630);
g.drawString("Bet :", 950, 660);
g.setColor(resultColor);
g.drawString("" + races, 1250, 600);
//BETS
g.setColor(textColor);
g.drawString("Horse Choice :", 75, 600);
g.drawString("Bet :", 75, 640);
if(horse1Result == false && horse2Result == false && horse3Result == false && horse4Result == false){
g.setColor(resultColor);
g.drawString(" " + firstHorse, 780, 600);
g.drawString(" " + secondHorse, 780, 630);
g.drawString(" " + thirdHorse, 780, 660);
g.drawString(" " + fourthHorse, 780, 690);
}
g.setColor(textColor);
g.setFont(font);
//HORSE 1 TEXT
String h1 = "Dominic -";
g.drawString(h1, 10, 130);
//HORSE 2 TEXT
String h2 = "Charlie -";
g.drawString(h2, 10, 230);
//HORSE 3 TEXT
String h3 = "Admiral -";
g.drawString(h3, 10, 330);
//HORSE 4 TEXT
String h4 = "Bacardi -";
g.drawString(h4, 10, 430);
}
回答1:
Looks like while(running) and Thread.sleep is giving your problems. For Swing apps use a javax.swing.Timer. Here is the basic construct
Timer(int delay, ActionListener listener)
where delay is the time to be delayed ("slept") between intervals and the listener is used just like a listener for a button, except you don't need to press a button for the event to fire, the Timer fires the event every delayed milliseconds. You can do something like this
Timer timer = new Timer(delay, new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
// the stuff in your while loop here
}
});
timer.starts();
Here's an example of a Timer being used. Take a look at the docs for more methods you can use with the timer.
Side Note
It's not recommended to use a null layout. Take a look at Laying out Components within a Container for details on how to use Layout Managers, as you should be using instead of a null layout.
来源：https://stackoverflow.com/questions/21516220/flashing-jtextfield-and-jbutton