我试图对我们学校的招生系统进行模拟。但我坚持一个问题，我无法弄清楚为什么，我呈现的框闪烁。我不需要它。你能帮助我吗？感谢。
import java.awt.Color;
import java.awt.*;
import java.awt.Graphics;
import java.util.Random;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates and open the template
* in the editor.
*/
/**
*
* @author paolo
*/
public class simulator extends JPanel {
Thread tr;
Image i;
Graphics gbfr;
Dimension size;
int num = 0, check, wid, hyt, oq;
Random rand = new Random();
Dimension locs[];
list waiting, queue;
boolean allowMove = false;
simulator(int w, int h) {
oq = 0;
wid = w;
hyt = h;
tr = new tr1();
locs = new Dimension[30];
waiting = new list(50);
queue = new list(30);
int tw, u;
for (u = 0, tw = 64; u < 10; u++, tw += 55) {
locs[u] = new Dimension(tw, 275);
locs[19 - u] = new Dimension(tw, 325);
locs[u + 20] = new Dimension(tw, 375);
}
}
public void paint(Graphics g) {
i = createImage(getWidth(), getHeight());
gbfr = i.getGraphics();
gbfr.setColor(getBackground());
gbfr.fillRect(0, 0, getWidth(), getHeight());
gbfr.setColor(getForeground());
paintComponent(gbfr);
g.drawImage(i, 0, 0, this);
}
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(new Color(225, 225, 225));
g.fillRect(0, 0, getWidth(), getHeight());
drawSettings(g);
drawStudents(g);
}
protected void drawSettings(Graphics g) {
g.setColor(new Color(225, 225, 225));
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(new Color(200, 200, 200));
g.fillRect(0, 0, 600, 200);
g.setColor(Color.black);
g.drawRect(0, 200, 20, 20);
g.drawRect(145, 200, 20, 20);
g.drawRect(290, 200, 20, 20);
g.drawRect(435, 200, 20, 20);
g.drawRect(580, 200, 20, 20);
g.drawRect(0, 0, 600, 200);
g.setColor(new Color(200, 200, 200));
g.fillRect(1, 180, 19, 40);
g.fillRect(146, 180, 19, 40);
g.fillRect(291, 180, 19, 40);
g.fillRect(436, 180, 19, 40);
g.fillRect(581, 180, 19, 40);
g.setColor(Color.black);
g.drawString("Cashier 1", 62, 190);
g.drawString("Cashier 2", 207, 190);
g.drawString("Cashier 3", 352, 190);
g.drawString("Cashier 4", 497, 190);
g.fillRect(20, 270, 560, 20);//
g.fillRect(20, 320, 560, 20);
g.fillRect(20, 370, 560, 20);
}
protected void drawStudents(Graphics g) {
waiting.drawStudents(g);
}
public class tr1 extends Thread implements Runnable {
public void run() {
for (check = 0;; check++) {
num++;
try {
if (num % 100 == 0 && waiting.max != waiting.countL) {
waiting.add();
}
repaint();
Thread.sleep(1);
} catch (InterruptedException e) {
}
//repaint();
}
}
}
public class list {
int max, countL;
students temp, head;
list() {
head = new students();
countL = 0;
head.setNext(null);
max = 0;
}
list(int m) {
countL = 0;
head = new students(1);
list();
max = m;
head.setNext(null);
}
void add() {
students t;
t = head;
if (countL == 0) {
countL++;
t.setNext(new students());
} else {
temp = head.getNext();
while (temp != null) {
temp = temp.getNext();
}
countL++;
head.setNext(new students());
//updateCount();
}
}
void delete(int c) {
students t = head, t1;
int aa = 1;
if (countL == 1) {
if (c == 1) {
t.setNext(null);
}
} else {
if (c == 1) {
t.setNext(t.getNext());
} else {
for (t = t.getNext(); aa < c; aa++, t = t.getNext()) {
}
t.setNext(t.getNext().getNext());
}
}
}
void updateCount() {
students t = new students();
t = head;
t = t.getNext();
System.out.println(countL + "__");
for (int q = 1; q < countL; q++) {
System.out.println(t);
t.setCount(q);
t = t.getNext();
}
}
void drawStudents(Graphics g) {
students t = head;
if (countL != 0) {
t = t.getNext();
while (t != null) {
g.setColor(t.getClr());
g.fillRect(t.xpos, t.ypos, 10, 10);
t = t.getNext();
}
}
}
}
public class students {
int xpos, ypos, year, level, servtime, waittime, pos, destx, desty, count;
Color clr;
boolean active, onq;
students next;
students() {
//System.out.print("Recieved");
xpos = rand.nextInt((wid - 580) + 1) + 580;
onq = false;
ypos = rand.nextInt((hyt - 280) + 1) + 280;
waittime = rand.nextInt((100 - 50) + 1) + 50;
servtime = rand.nextInt((200 - 100) + 1) + 100;
count = 0;
level = 0;
next = null;
year = rand.nextInt((4 - 1) + 1) + 1;
clr = new Color(12, 12, 12);
if (year == 1) {
clr = Color.GREEN;
} else if (year == 2) {
clr = Color.YELLOW;
} else if (year == 3) {
clr = Color.RED;
} else {
clr = Color.BLUE;
}
pos = 0;
active = false;
}
students(int i) {
count = 0;
}
void setxpos(int x) {
xpos = x;
}
void setypos(int y) {
ypos = y;
}
void setpos(int p) {
pos = p;
}
void setCount(int q) {
count = q;
}
students getNext() {
return next;
}
Color getClr() {
return clr;
}
void setNext(students n) {
next = n;
}
int getpos() {
return pos;
}
boolean isActive() {
return active;
}
void activate() {
active = true;
}
}
}
答案 0 :(得分：2)
paint(Graphics g)方法paintComponent(Graphics g)方法中绘制图像。请注意，您的代码不能为我重现您的问题。我没有看到任何眨眼。是否应该有一些我们没有看到的动画？
如，
// class names should begin with an upper-case letter
public class Simulator extends JPanel {
// ....
private BufferedImage settings = null;
Simulator(int w, int h) {
// ....
settings = createSettings();
}
@Override
public Dimension getPreferredSize() {
return new Dimension(wid, hyt);
}
// public void paint(Graphics g) {
// i = createImage(getWidth(), getHeight());
// gbfr = i.getGraphics();
// gbfr.setColor(getBackground());
// gbfr.fillRect(0, 0, getWidth(), getHeight());
//
// gbfr.setColor(getForeground());
// paintComponent(gbfr);
//
// g.drawImage(i, 0, 0, this);
// }
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(new Color(225, 225, 225));
g.fillRect(0, 0, getWidth(), getHeight());
if (settings != null) {
g.drawImage(settings, 0, 0, this);
}
// !! drawSettings(g);
drawStudents(g);
}
private BufferedImage createSettings() {
int width = 700;
int height = 500;
BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics g = img.getGraphics();
g.setColor(new Color(225, 225, 225));
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(new Color(200, 200, 200));
g.fillRect(0, 0, 600, 200);
g.setColor(Color.black);
g.drawRect(0, 200, 20, 20);
g.drawRect(145, 200, 20, 20);
g.drawRect(290, 200, 20, 20);
g.drawRect(435, 200, 20, 20);
g.drawRect(580, 200, 20, 20);
g.drawRect(0, 0, 600, 200);
g.setColor(new Color(200, 200, 200));
g.fillRect(1, 180, 19, 40);
g.fillRect(146, 180, 19, 40);
g.fillRect(291, 180, 19, 40);
g.fillRect(436, 180, 19, 40);
g.fillRect(581, 180, 19, 40);
g.setColor(Color.black);
g.drawString("Cashier 1", 62, 190);
g.drawString("Cashier 2", 207, 190);
g.drawString("Cashier 3", 352, 190);
g.drawString("Cashier 4", 497, 190);
g.fillRect(20, 270, 560, 20);//
g.fillRect(20, 320, 560, 20);
g.fillRect(20, 370, 560, 20);
g.dispose();
return img;
}
// ...
}