multithreading

问题 I have the following code: public class Derived implements Runnable { private int num; public synchronized void setA(int num) { try { Thread.sleep(1000); } catch (InterruptedException e) { } System.out.println("Setting value " + Thread.currentThread().getName()); this.num = num; } @Override public void run() { System.out.println("In run: " + Thread.currentThread().getName()); setA(20); } public static void main(String[] args) { Derived obj = new Derived(); Thread t1 = new Thread(obj); t1

问题 I have the following code: public class Derived implements Runnable { private int num; public synchronized void setA(int num) { try { Thread.sleep(1000); } catch (InterruptedException e) { } System.out.println("Setting value " + Thread.currentThread().getName()); this.num = num; } @Override public void run() { System.out.println("In run: " + Thread.currentThread().getName()); setA(20); } public static void main(String[] args) { Derived obj = new Derived(); Thread t1 = new Thread(obj); t1

问题 I need to add a progress bar in a JFrame but I want to update this bar without generating a new Thread (for example SwingWorker that update bar in background). Is there a way to update progress bar in current thread (the current thread of the main JFrame)? In details I have first class ("ChooseGUI") that extends JFrame and that calls second class. This second class ("ProgressFrame") is another extension of JFrame: when I press a button in ChooseGUI, ChooseGUI becomes not visible,

问题 I need to add a progress bar in a JFrame but I want to update this bar without generating a new Thread (for example SwingWorker that update bar in background). Is there a way to update progress bar in current thread (the current thread of the main JFrame)? In details I have first class ("ChooseGUI") that extends JFrame and that calls second class. This second class ("ProgressFrame") is another extension of JFrame: when I press a button in ChooseGUI, ChooseGUI becomes not visible,

问题 I'm trying to update a progress bar in Java FX. My first problem was that the window said "not responding" instead of actually updating. It just froze and then after the tasks were done, the progress bar became full. So I found out that I had to use multithreading and implemented it like this. overallList.clear(); progressbar.setprogress(0); for(Object obj : list) { class ThreadProgress implements Runnable { // inner class public void run() { thisList = scrape(obj); overallList.add(thisList);

问题 I have this code, which works as I wanted but I don't understand exactly why. Thinking about a stack in C, C++, I'd guess that the p variable will be on the stack on each call, and then erased when the method returns. How does the closure of the thread captures it and more over, captures the correct value every time? The output is what I wanted - files are "_a", "_b", "_c". public enum enumTest { a = 1, b =2, c=3 } private void Form1_Load(object sender, EventArgs e) { callme(enumTest.a);

问题 I need help in socket programming again. Now I want to write the value of my textfield to my remote server log file in linux after a button is clicked by using the command. "echo '" +textfieldValue+"' >> filename" I made two threads in the Server.java Thread one is to output the values of tail -f /root/log.txt to my client Thread two is to read the command "echo '" +textfieldValue+"' >> filename" sent from the client. My thread one is running but my thread two is not executing. Please help.

问题 I need help in socket programming again. Now I want to write the value of my textfield to my remote server log file in linux after a button is clicked by using the command. "echo '" +textfieldValue+"' >> filename" I made two threads in the Server.java Thread one is to output the values of tail -f /root/log.txt to my client Thread two is to read the command "echo '" +textfieldValue+"' >> filename" sent from the client. My thread one is running but my thread two is not executing. Please help.

问题 This question already has answers here : Threading in python using queue (3 answers) Closed 2 years ago . I have the following which threads a print function. from threading import Thread from random import * import time def PrintRandom(): rand = random() time.sleep(rand) print(rand) if __name__ == "__main__": Thread(target=PrintRandom).start() Thread(target=PrintRandom).start() This works the majority of the time with the following being ouput 0.30041615558463897 0.5644155082254415 However,

问题 This question already has answers here : Threading in python using queue (3 answers) Closed 2 years ago . I have the following which threads a print function. from threading import Thread from random import * import time def PrintRandom(): rand = random() time.sleep(rand) print(rand) if __name__ == "__main__": Thread(target=PrintRandom).start() Thread(target=PrintRandom).start() This works the majority of the time with the following being ouput 0.30041615558463897 0.5644155082254415 However,