JFrame图形界面冻结+幻影
JFrame图形界面冻结+幻影
提问于 2017-04-11 22:32:24
好吧，我知道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
我不明白为什么当我启动这个框架(这是第二个)，从第一个冻结，但如果我启动第二个框架，它分别显示。
我希望从这个问题中引出两件事
1:如何编写代码(线程工作人员？)在后台运行循环。
2:为什么当我从第一帧启动它时，它没有冻结(见下文)
预先谢谢您&这是第一个帧代码
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();
}
}2 2ndFrameRunning是第二个框架，它的已经从它的实际名称更改了，这就是为什么它破坏了java语法规则。
没有错误，只有“幻影”冻结。
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
}
}FRAME 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
}
}如果您的不像那样，您只需下载.zip w/所有文件
https://drive.google.com/open?id=0BzuCgrBgpuD1V3dKLUFfQU12UWc
回答 1
Stack Overflow用户
回答已采纳
发布于 2017-04-12 21:59:22
就像我在评论中说的，当.
public static void main (String args[]){
new second(); //StackOverflow
}它是由JVM调用的(因为您已经从命令行执行了类)，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分派线程的上下文中执行，因此不会阻止UI。
当您调用frame.setVisible时，底层API将创建事件调度线程，所有基于UI的代码都将在一个单独的线程上执行，在构造函数中启动的代码将在“主”线程的上下文中执行。
当调用closeGameButton的closeGameButton时，不管您如何启动代码，这都会阻塞事件调度线程，直到killGame完成为止。
您可以通过更改second的方式使其行为相同。
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
}
});
}这就是启动所有Swing应用程序的方式。
我建议你先看看在Swing中并发和Worker和SwingWorker
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/43357272
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