JFrame显示灰色，空白 [英] JFrame shows up grey, blank
本文介绍了JFrame显示灰色，空白的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个问题，我的框架显示为灰色，但几秒钟后它显示图像，因为我的for循环正在完成。我需要这样做才能在打开图像时正确显示图像以显示循环。这是我的整个代码，抱歉长度：
I have a problem where my frame shows up as grey, but then after a few seconds it displays the image as my for loop is finishing. I need to make it so that it displays the image correctly once it opens in order to show the loop. Here is my entire code, sorry about the length:
import java.awt.*;
import javax.swing.*;
public class MainFrame extends JFrame{
public void MainFrame() {
setTitle("Game");
setSize(1300, 650);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
setBackground(Color.WHITE);
Dice diceObject = new Dice();
add(diceObject);
}
}
import java.awt.*;
import java.util.Random;
import javax.swing.*;
public class Dice extends JPanel {
public static int pause(int n)
{
try {
Thread.sleep(n);
} catch(InterruptedException e) {
}
return n;
}
public void Dice() {
setDoubleBuffered(true);
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
int width = getWidth();
int height = getHeight();
int num = 0;
for (int i = 0; i < 7; i++) {
Random generator= new Random();
int number = generator.nextInt(6)+1;
g.setColor(Color.WHITE);
g.fillRect(0, 0, width, height);
g.setColor(Color.BLACK);
g.drawRoundRect(550, 150, 200, 200, 50, 50);
System.out.println("Test");
if (number == 1) { //Roll one
num = 1;
g.setColor(new Color (0, 0, 0));
g.fillOval(640, 240, 20, 20);
pause(100);
} if (number == 2) { //Roll two
num = 2;
g.setColor(new Color (0, 0, 0));
g.fillOval(590, 290, 20, 20);
g.fillOval(690, 190, 20, 20);
pause(100);
} if (number == 3) { //Roll three
num = 3;
g.setColor(new Color (0, 0, 0));
g.fillOval(590, 290, 20, 20);
g.fillOval(640, 240, 20, 20);
g.fillOval(690, 190, 20, 20);
pause(100);
} if (number == 4) { //Roll four
num = 4;
g.setColor(new Color (0, 0, 0));
g.fillOval(590, 290, 20, 20);
g.fillOval(590, 190, 20, 20);
g.fillOval(690, 290, 20, 20);
g.fillOval(690, 190, 20, 20);
pause(100);
} if (number == 5) { //Roll five
num = 5;
g.setColor(new Color (0, 0, 0));
g.fillOval(590, 290, 20, 20);
g.fillOval(590, 190, 20, 20);
g.fillOval(640, 240, 20, 20);
g.fillOval(690, 290, 20, 20);
g.fillOval(690, 190, 20, 20);
pause(100);
} if (number == 6) { //Roll six
num = 6;
g.setColor(new Color (0, 0, 0));
g.fillOval(590, 190, 20, 20);
g.fillOval(590, 240, 20, 20);
g.fillOval(590, 290, 20, 20);
g.fillOval(690, 190, 20, 20);
g.fillOval(690, 240, 20, 20);
g.fillOval(690, 290, 20, 20);
pause(100);
}
}
g.setFont(new Font("TimesRoman", Font.PLAIN, 20));
g.drawString("You rolled a " + num, 590, 100);
pause(1000);
}
}
提前致谢。
推荐答案
第一个问题是你在向它添加任何东西之前设置框架是可见的......
The first problem is the fact that you are setting the frame visible BEFORE you add anything to it...
相反，尝试调用 setVisible last
Instead, try calling setVisible last
public class MainFrame extends JFrame{
public void MainFrame() {
setTitle("Game");
setSize(1300, 650);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBackground(Color.WHITE);
Dice diceObject = new Dice();
add(diceObject);
setVisible(true);
}
}
您还应避免直接从<$ c $延伸c> JFrame 因为你没有在类中添加任何新功能而需要考虑初始线程并确保在Event Dispatching Thread的上下文中启动主UI。
You should also avoid extending directly from JFrame as you're not adding any new functionality to the class and need to take into consideration Initial Threads and ensure you are starting the main UI within the context of the Event Dispatching Thread.
其余问题与您的之前的问题有关
更新了工作示例
因为我很懒，我使用了Graphics 2D API画点。我这样做是因为许多数字出现在许多数字的相同位置...
Cause I'm lazy, I've utilised the Graphics 2D API to draw the dots. I did this because many of the dots appear in the same locations for many of the numbers...
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Ellipse2D;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class DiceRoller {
public static void main(String[] args) {
new DiceRoller();
}
public DiceRoller() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new Die());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class Die extends JPanel {
private int number = 1;
public Die() {
Timer timer = new Timer(500, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
number = (int) (Math.round((Math.random() * 5) + 1));
repaint();
}
});
timer.setRepeats(true);
timer.setInitialDelay(0);
timer.start();
}
@Override
public Dimension getPreferredSize() {
return new Dimension(220, 220);
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
int width = getWidth();
int height = getHeight();
g2d.setColor(Color.WHITE);
g2d.fillRect(0, 0, width, height);
g2d.setColor(Color.BLACK);
g2d.drawRoundRect(10, 10, width - 20, height - 20, 50, 50);
List<Shape> dots = new ArrayList<>(6);
if (number == 1 || number == 3 || number == 5) {
int x = (width - 20) / 2;
int y = (height - 20) / 2;
dots.add(new Ellipse2D.Float(x, y, 20, 20));
}
if (number == 2 || number == 3 || number == 4 || number == 5 || number == 6) {
int x = ((width / 2) - 20) / 2;
int y = ((height / 2) - 20) / 2;
dots.add(new Ellipse2D.Float(x, y, 20, 20));
dots.add(new Ellipse2D.Float(x + (width / 2), y + (height / 2), 20, 20));
}
if (number == 4 || number == 5 || number == 6) {
int x = (width / 2) + (((width / 2) - 20) / 2);
int y = ((height / 2) - 20) / 2;
dots.add(new Ellipse2D.Float(x, y, 20, 20));
dots.add(new Ellipse2D.Float(x - (width / 2), y + (height / 2), 20, 20));
}
if (number == 6) {
int x = (((width / 2) - 20) / 2);
int y = (height - 20) / 2;
dots.add(new Ellipse2D.Float(x, y, 20, 20));
dots.add(new Ellipse2D.Float(x + (width / 2), y, 20, 20));
}
for (Shape dot : dots) {
g2d.fill(dot);
}
g2d.dispose();
}
}
}
这篇关于JFrame显示灰色，空白的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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