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Java program stop work


Java program stop work

By : user2956194
Date : November 22 2020, 10:54 AM
this one helps. 10mb is a very small amount of memory, and before I go any further I want to make it clear that it is not enough memory. The permanent space is taking up 55.08% of that amount. Old generation is taking up 34.90%, and the Eden space is at 12.72%. This adds up to 102.7% of the maximum heap size you've allowed, and I'm guessing that an OutOfMemoryError was thrown shortly after this reading.
https://docs.oracle.com/javase/1.5.0/docs/tooldocs/share/jstat.html#gcutil_option
code :


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Stop external program when Java program is stopped

Stop external program when Java program is stopped


By : user3147380
Date : March 29 2020, 07:55 AM
it helps some times To trigger the shutdown, you could add a shutdown hook to your Java application. See Runtime.addShutdownHook().
To effect the shutdown, you could either communicate to the external process a request to stop gracefully, or call Process.destroy()
Java exceptions and program flow: how to know if the program will stop or continue after an exception is thrown?

Java exceptions and program flow: how to know if the program will stop or continue after an exception is thrown?


By : Anita Bahar
Date : March 29 2020, 07:55 AM
it fixes the issue It isn't executed because uncaught exceptions terminate the current thread(main thread in your case).
test() throws a RuntimeException. Surrounding test() with a try-catch would catch the exception and allow your program to continue.
code :
try {
    test();
} catch(RuntimeException e) {
    System.out.println("test() failed");
}
How to Stop a Running a Program Using Other Java Program

How to Stop a Running a Program Using Other Java Program


By : farheen khan
Date : March 29 2020, 07:55 AM
around this issue I'd suggest to use the following solution:
start your program with a title specified get PID of the process using "tasklist" command. A CSV parser required. There are tons of available I believe, like org.apache.commons.csv.CSVParser etc :) kill the process by "taskkill" command using PID.
code :
public static final String          NL = System.getProperty("line.separator", "\n");

public <T extends Appendable> int command(String... cmd) throws Exception {
    return command(null, cmd);
}

public <T extends Appendable> int command(T out, String... cmd) throws Exception {
    try {

        final ProcessBuilder pb = new ProcessBuilder(cmd);

        pb.redirectErrorStream(true);

        final Process proc = pb.start();
        final BufferedReader rd = new BufferedReader(new InputStreamReader(proc.getInputStream()));

        for (;;) {
            final String line = rd.readLine();

            if (line == null) {
                break;
            }

            if (out != null) {
                out.append(line);
                out.append(NL);
            }
        }

        return proc.waitFor();

    } catch (InterruptedException e) {
        throw new IOException(e);
    }
} 

public void startProcessWithTitle(String pathToExe, String title) throws Exception {
    command("cmd.exe", "/C", "start", '"' + pathToExe + '"', '"' + title + '"', ..cmd.params..);
}

public int findProcessByTitle(String title) throws Exception {

    final StringBuilder list = new StringBuilder();

    if (command(list, "tasklist", "/V", "/FO", "csv") != 0) {
        throw new RuntimeException("Cannot get tasklist. " + list.toString());
    }

    final CSVReader csv = new CSVReader(new StringReader(list.toString()), ',', true, "WindowsOS.findProcessByTitle");
    csv.readHeaders(true); // headers

    int pidIndex = csv.getHeaderIndex("PID");
    int titleIndex = csv.getHeaderIndex("Window Title");

    while (csv.nextLine()) {
        final String ttl = csv.getString(titleIndex, true);
        if (ttl.contains(title)) {
            return csv.getInt(pidIndex);                
        }
    }

    Utils.close(csv);

    return -1;
}

public boolean killProcess(int pid) throws Exception {
    return command("taskkill", "/T", "/F", "/PID", Integer.toString(pid)) == 0;
}    
What's wrong with my codes? When I enter string then the program is stop working. How can I keep work the program even e

What's wrong with my codes? When I enter string then the program is stop working. How can I keep work the program even e


By : user3720952
Date : March 29 2020, 07:55 AM
will be helpful for those in need Is the problem that you want to swallow the exception and keep the program running on invalid input? If so, remove the raise. You'll also need to put the s_int checks inside the try.
code :
print ("bu program sıcaklığa göre suyun durumunu gösterir")
while True:
   s=input("lütfen sıcaklığı giriniz.çıkmak içn q ya bas")
   if s=="q":
        print("çıkılıyor")
        break
   try:
        s_int=int(s)
        if s_int<0:
            print("Durum Buzdur")
        elif s_int>=100:
            print("Durum Buhar")
        else:
            print("Durum su")
   except ValueError:
        print("Lütfen sadece sayı giriniz")
Java one code to stop in a loop and not stop the entire program in eclipse

Java one code to stop in a loop and not stop the entire program in eclipse


By : Lamantenok
Date : March 29 2020, 07:55 AM
I wish this help you If you have Thread.sleep(xxx); in the current thread, then yes, it will stop the current thread for xxx seconds. Because (most likely) Thread.sleep is in the same thread that is controlling the GUI, it is pausing your code from executing, freezing your application. There are two ways you can fix this:
Create a new thread and place the timer code in there:
code :
    // Because the code is in a different thread, Thread.sleep(1000) will not pause
    // the current thread and the application will continue as normal
    Thread thread = new Thread(new Runnable() {

        int seconds = 0;

        @Override
        public void run()
        {
            while (true) {

                // wait one second
                try {
                    Thread.sleep(1000);
                }
                catch (InterruptedException e) {
                    e.printStackTrace();
                };
                // increment seconds
                seconds++;

                System.out.println(seconds);
            }
        }

    });

    thread.start();
Timer timer = new Timer(1000, new ActionListener() {
    public void actionPerformed(ActionEvent a)
    {
        System.out.println("Timer went off!");
    }
});

// Repeat every second
timer.start();
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