【发布时间】：2012-03-30 20:31:43
【问题描述】：
我在并行运行两个线程时遇到问题。每个线程单独运行良好。我的要求是显示 10 个球，如果value 是0，则显示一个红球，如果value 是1，则显示一个绿球，一个接一个。 value 中的数据是从包含0s 或1s 的数组中接收的。我需要一起运行 16 个这样的线程。我目前正在尝试两个。
package pkg2;
public class mainClass {
public static void main(String[] args) {
Intermediate frame = new Intermediate();
}
}
主类调用中间类
package pkg2;
import java.awt.Color;
import javax.swing.*;
public class Intermediate extends JFrame {
public Intermediate() {
DivScreen ob = new DivScreen();
ob.setBackground(Color.black);
ob.divScreen1(16);
add(ob);
pack();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
setSize(1370, 740);
setResizable(false);
}
}
在中间类中，创建了一个 DivScreen 类的对象，所有线程和 GUI 部分都已完成。
package pkg2;
import java.awt.*;
import javax.swing.*;
public class DivScreen extends Canvas implements Runnable//,ActionListener
{
Thread t1[]; //threads
int i, j; //n=total no. of lines, i=no. of rows, j=no of columns
public static int x; // x is now global variable
public static int i1 = 0, i2 = 0; //to continue fetching data from last entry
public static int c1 = 0, c2 = 0; // to check whether line is working or not
public static int y1, y2; // to show red or green balls
public static int k1 = 0, k2 = 0; //to draw 10 balls
int green, blue, red; //variables for color of lines
int arr1[] = {1, 1, 0, 1};
int arr2[] = {1, 0, 1, 0, 1, 0};
public DivScreen() //default. constructor
{
//setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Font f = new Font("Arial", Font.BOLD, 30);
setFont(f);
}
public void divScreen1(int m) {
t1 = new Thread[2]; //HERE WE HAVE TO PAAS n AS SIZE OF THREAD ARRAY
// BUT JUST TO CHECK ITS WORKING WE ARE USING 2 THREADS
for (int i = 0; i < 2; i++) {
t1[i] = new Thread(this, (i + 1) + "thread");
t1[i].start();
}
}
public void paint(Graphics g) {
g.setColor(Color.white);
for (int i = 1; i < 4; i++) {
j = i; //j is for horizontal lines
g.drawLine(i * 342, 0, i * 342, 740); //i is for vertical lines
g.drawLine(0, j * 185, 1370, j * 185);
}
if (x == 1) {
g.setColor(Color.GRAY);
g.drawString("Line 1", 150, 50);
if (c1 == 0) {
g.drawString("Line is not in use", 30, 150);
g.setColor(Color.black);
g.fillRect(45, 90, 200, 30);
} else {
g.setColor(Color.black);
g.fillRect(30, 120, 250, 30);
if (k1 < 10) {
if (y1 == 0) {
g.setColor(Color.red);
} else {
g.setColor(Color.green);
}
g.fillOval(50 + 20 * (k1++), 100, 15, 15);
} else {
k1 = 0;
g.setColor(Color.black);
g.fillRect(45, 90, 200, 30);
}
}
}
if (x == 2) {
g.setColor(Color.gray);
g.drawString("Line 2", 460, 50);
if (c2 == 0) {
g.drawString("Line is not in use", 370, 150);
g.setColor(Color.black);
g.fillRect(385, 90, 200, 30);
} else {
g.setColor(Color.black);
g.fillRect(370, 120, 250, 30);
if (k2 < 10) {
if (y2 == 0) {
g.setColor(Color.red);
} else {
g.setColor(Color.green);
}
g.fillOval(390 + 20 * (k2++), 100, 15, 15);
} else {
k2 = 0;
g.setColor(Color.black);
g.fillRect(385, 90, 200, 30);
}
}
}
}
public void update(Graphics g) {
paint(g);
}
public void run() {
while (true) {
if (Thread.currentThread().getName().equals("1thread")) {
x = 1;
int value = 0; // to get value from array
while (i1 < 4) {
c1 = 1;
value = arr1[i1]; //valid is a value containing 1 or 0
i1++; // 1 implies product is OK, 0 implies product not OK
System.out.println(value);
if (value == 1) {
y1 = 1; // we will check its value in paint() function
} else {
y1 = 0;
}
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
repaint(0, 0, 342, 185);
}
});
try {
Thread.sleep(200);
} catch (Exception e) {
System.out.println(e);
}
}
c1 = 0;
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
repaint(0, 0, 342, 185);
}
});
try {
Thread.sleep(200);
} catch (Exception e) {
System.out.println(e);
}
}
if (Thread.currentThread().getName().equals("2thread")) {
x = 2;
int value2 = 0; // to get value from arr2[]
while (i2 < 6) {
c2 = 1;
value2 = arr2[i2];
i2++;
System.out.println(value2);
if (value2 == 1) {
y2 = 1;
} else {
y2 = 0;
}
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
repaint(342, 0, 342, 185);
}
});
try {
Thread.sleep(200);
} catch (Exception e) {
System.out.println(e);
}
}
c2 = 0;
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
repaint(342, 0, 342, 185);
}
});
try {
Thread.sleep(200);
} catch (Exception e) {
System.out.println(e);
}
}
}
}
}
如果您能找到什么，请回复。 谢谢。
【问题讨论】：
-
拥有一个既是 JComponent 又是 Runnable 的类看起来很奇怪。
-
不要无故混用 Swing（例如
JFrame）和 AWT（例如Canvas）组件。为了尽快获得更好的帮助，请发帖SSCCE。
标签： java multithreading swing graphics awt