java - JFrame GUI 卡住 + Phantom

Question

好吧，我明白我不应该有这个循环

while (pidInfo.contains(<processname>)){
    pidInfo ="";
    check<processname> =Runtime.getRuntime().exec(System.getenv("windir") +"\\system32\\"+"tasklist.exe");
    input =  new BufferedReader(new InputStreamReader(check<processname>.getInputStream()));

    while ((line = input.readLine()) != null) {
        pidInfo+=line; 
    }

    input.close();

    if (pidInfo.contains(<processname>)){
        System.out.println("<processname> RUNNING");
    }
    else if (closeReason == 2){
        System.out.println("<processname> STOPPED VIA PROG & USER");
        status = "Not Running";
        int ll = JOptionPane.showOptionDialog(null, "<processname>", "Error", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null);
        if (ll == JOptionPane.OK_OPTION){
            //frame.setAlwaysOnTop(true);
            frame.dispose();
        }
    }
    // TODO: Other exit
} 

基于其他问题但是

我不明白为什么当我从第一个框架启动这个框架(这是第二个框架)时它会卡住，但如果我单独启动第二个框架它会显示。

我希望从这个问题中得到两点

1:如何编写在后台运行循环的事物(threadworker？)。

2:为什么当我从第一帧启动它时它不会卡住(见下文)

提前谢谢您，这是第一个框架代码

if(pidInfo.contains(<processname>)) {
    frame.setAlwaysOnTop(false);
    status = "Running - In Game";

    System.out.println("<processname>1st RUNNING");
    int a = JOptionPane.showOptionDialog(null, "SUCCESS!", "Success", JOptionPane.DEFAULT_OPTION, JOptionPane.INFORMATION_MESSAGE, null, null, null);
    if (a == JOptionPane.OK_OPTION) {
        frame.dispose();
        new 2ndFrameRunning();
    }
}

2ndFrameRunning 是第二个框架，它已更改了其实际名称，这就是为什么它违反了 java 语法规则。

没有错误，只是“幻影”卡住。

示例代码

框架 1:命名为“menu.java”

/* Stack Overflow
* By Rabbitmcv
*/
package main;
// Imports
import java.awt.event.*;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.awt.*;
import javax.swing.*;

public class Menu implements ActionListener{
    // Func
    // Creates the JFrame
    JFrame frame = new JFrame();
    // Public Vars
    boolean isGameRunning = false;
    String status = "Not Running - In Main Menu";
    // All code goes here
        public Menu(){
            // Vars
            // Frame Vars
            frame.setResizable(false);
            frame.setSize(800, 600);
            frame.setLocationRelativeTo(null);
            frame.setDefaultCloseOperation(WindowConstants.HIDE_ON_CLOSE);
            frame.setAlwaysOnTop(true);
            // JPanels
            JPanel defaultPanel = new JPanel();
            // DefaultPanel J...
            JLabel title = new JLabel("FirstLabel");
            JLabel risk = new JLabel("SecondLabel");
            JLabel titleSub = new JLabel("StackOverflow");
            JButton start2frame = new JButton("start2frame");
            // DefaultPanel Button Code
            start2frame.addActionListener(new ActionListener(){
                @Override
                public void actionPerformed(ActionEvent arg0){
                    System.out.println("start2frame button pressed");
                    try{
                        String line;
                        String pidInfo ="";

                        Process checkcs =Runtime.getRuntime().exec(System.getenv("windir") +"\\system32\\"+"tasklist.exe");

                        BufferedReader input =  new BufferedReader(new InputStreamReader(checkcs.getInputStream()));

                        while ((line = input.readLine()) != null) {
                            pidInfo+=line; 
                        }

                        input.close();

                        if(pidInfo.contains("explorer.exe")) // The process name here has been changed from the real process for StackOverflow.
                        {
                            frame.setAlwaysOnTop(false);
                            status = "Running - In Game";
                            frame.setTitle("StackOverflow - "+status);
                            System.out.println("1st Game RUNNING");
                            // TODO: hackRunning 
                            int a = JOptionPane.showOptionDialog(null, "SUCCESS", "Success", JOptionPane.DEFAULT_OPTION, JOptionPane.INFORMATION_MESSAGE, null, null, null);
                            if (a == JOptionPane.OK_OPTION){
                                frame.dispose();
                                new second();
                            }
                        }
                        else{
                            isGameRunning = false;
                            status = "Not Running - ERROR: Game NOT RUNNING";
                            frame.setTitle("StackOverflow - "+status);
                            System.out.println("game NOT RUNNING");
                            frame.setAlwaysOnTop(false);
                            int a = JOptionPane.showOptionDialog(null, "Game is not running", "Error", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null);
                                    if (a == JOptionPane.OK_OPTION){
                                        frame.setAlwaysOnTop(true);
                                    }
                        }
                    }
                    catch(Exception e){
                        System.out.println("Failed to check process");
                        e.printStackTrace();
                    }
                }
            });
            // Set Layouts 
            defaultPanel.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
            defaultPanel.setLayout(new GridLayout(0, 1));
            // Adds the J... to a Jpanel (IN ORDER FROM TOP TO BOTTOM)
            defaultPanel.add(title);
            defaultPanel.add(risk);
            defaultPanel.add(titleSub);
            defaultPanel.add(start2frame);
            // Center Labels
            title.setHorizontalAlignment(JLabel.CENTER);
            risk.setHorizontalAlignment(JLabel.CENTER);
            titleSub.setHorizontalAlignment(JLabel.CENTER);
            // Add the JPanel to the JFrame
            frame.add(defaultPanel);
            // Vis
            frame.revalidate();
            frame.setTitle("StackOverflow - "+status);
            frame.setVisible(true);
    }

        public static void main (String args[]){
            new Menu();
        }
    @Override
    public void actionPerformed(ActionEvent e) {
        // AUTO: Because of actionlistener

    }

}

框架 2 命名为“second.java”

/* StackOverflow - 2nd
* By Rabbitmcv
* If one runs this one sans the first program it shows non-frozen... but if you run it from menu.java it will freeze... probably something with threads.
*/
package main;

// Import
import java.awt.event.*;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.awt.*;
import javax.swing.*;
// This file has been renamed to 2.java
public class second implements ActionListener{
    // Frame
    JFrame frame= new JFrame();
    // Panel
    JPanel panel = new JPanel();
    // Int
    // closeReason: 0 = user, 1 = program, 2 = user init via prog (non-error)
    int closeReason = 0;
    // String
    String status = "Running";
    public second(){
        // Set Settings
        frame.setResizable(false);
        frame.setSize(800, 600);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(WindowConstants.HIDE_ON_CLOSE);
        frame.setAlwaysOnTop(true);
        // Crap

        frame.setTitle("StackOverflow- Running");
        // Settings
        // Add J...
        JLabel label = new JLabel("Game "+status);
        JButton closeGameButton = new JButton("Click here to close game");
        // Adds the J... to a Jpanel (IN ORDER FROM TOP TO BOTTOM)
        panel.add(label);
        panel.add(closeGameButton);
        // Button Func.
        closeGameButton.addActionListener(new ActionListener(){
            @Override
            public void actionPerformed(ActionEvent arg0){
                try {
                    System.out.println("CloseGameButton Pressed");
                    Process killGame = Runtime.getRuntime().exec("taskkill /F /IM explorer.exe"); // My process has been changed to explorer.exe !!!! THIS WILL STOP WINDOWS EXPLORER. Feel free to change it to another process
                    closeReason = 2;
                    int exitCode = killGame.waitFor();
                    if (exitCode != 0){
                        throw new IOException("Failed to kill game; game not running");
                    }
                    frame.setTitle("StackOverflow - Not Running - Closed by user");
                    frame.setAlwaysOnTop(false);
                    int a = JOptionPane.showOptionDialog(null, "game has been closed", "game Closed", JOptionPane.DEFAULT_OPTION, JOptionPane.INFORMATION_MESSAGE, null, null, null);
                    if (a == JOptionPane.OK_OPTION){
                        frame.setAlwaysOnTop(true);
                        frame.setTitle("StackOverflow - Not Running - Closed by user");
                    }
                } catch (Exception e) {
                    frame.setAlwaysOnTop(false);
                    System.out.println("Failed to kill game");
                    int a = JOptionPane.showOptionDialog(null, "game is not running", "Error", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null);
                    if (a == JOptionPane.OK_OPTION){
                        frame.setAlwaysOnTop(true);
                    }
                    e.printStackTrace();
                }
            }
        });
        // END BUTTON FUNC
        // Set layouts
        panel.setBorder(BorderFactory.createEmptyBorder(10, 10, 30, 10));
        panel.setLayout(new GridLayout(0, 1));
        // Center Labels
        label.setHorizontalAlignment(JLabel.CENTER);
        // Add the JPanel to the JFrame
        frame.add(panel);
        // end
        frame.revalidate();
        System.out.println("far");
        frame.setVisible(true);

        try{
            String line;
            String pidInfo ="";

            Process checkcs =Runtime.getRuntime().exec(System.getenv("windir") +"\\system32\\"+"tasklist.exe");

            BufferedReader input =  new BufferedReader(new InputStreamReader(checkcs.getInputStream()));

            while ((line = input.readLine()) != null) {
                pidInfo+=line; 
            }

            input.close();

            if (pidInfo.contains("explorer.exe")){ // Changed to explorer.exe
                System.out.println("game running - pid");
                status = "Running";
                while (pidInfo.contains("explorer.exe")){ // Changed to explorer.exe
                    pidInfo ="";
                    checkcs =Runtime.getRuntime().exec(System.getenv("windir") +"\\system32\\"+"tasklist.exe");
                    input =  new BufferedReader(new InputStreamReader(checkcs.getInputStream()));

                    while ((line = input.readLine()) != null) {
                        pidInfo+=line; 
                    }

                    input.close();

                    if (pidInfo.contains("explorer.exe")){ // This checks if the process is still going on... changed to explorer.exe
                        System.out.println("game RUNNING");
                    }
                    else if (closeReason == 2){
                        System.out.println("game STOPPED VIA PROG & USER");
                        status = "Not Running";
                        int ll = JOptionPane.showOptionDialog(null, "game has stopped running", "Error", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null);
                        if (ll == JOptionPane.OK_OPTION){
                            //frame.setAlwaysOnTop(true);
                            frame.dispose();
                        }
                    }
                    // TODO: Other exit
                }
            }
        }
        catch(Exception e){
            System.out.println("Failed to check process");
            e.printStackTrace();
        }
    }
    public static void main (String args[]){
        new second(); //StackOverflow
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub

    }
}

如果您不喜欢，您可以直接下载包含所有文件的 .zip

https://drive.google.com/open?id=0BzuCgrBgpuD1V3dKLUFfQU12UWc

Answer 1

正如我在评论中所说，当...

public static void main (String args[]){
    new second(); //StackOverflow
}

被调用(即由JVM调用，因为您已经从命令行执行了该类)，它在JVM的“主”线程中运行。

这意味着构造函数中的代码不会在事件调度线程的上下文中执行，因此不会阻塞 UI。

当您调用frame.setVisible时，底层API将创建事件调度线程，并且所有基于UI的代码将在单独的线程上执行，而您在构造函数中启动的代码将在构造函数中执行“主”线程的上下文。

当调用 closeGameButton 的 ActionListener 时，无论您如何启动代码，都会阻塞事件调度线程，直到 killGame 完成.

您可以通过更改使第二个以相同的方式执行

public static void main (String args[]){
    new second(); //StackOverflow
}

至

public static void main (String args[]){
    SwingUtilities.invokeLater(new Runnable() {
        @Override
        public void run() {
            new second(); //StackOverflow
        }
    });
}

这就是您应该如何启动所有 Swing 应用程序

我建议您首先查看 Concurrency in Swing和Worker Threads and SwingWorker