On starting a JVM instance on my machine, with a simple class running infinite sleep in main() , I see four key threads (apart from the main thread) in the JVM: Attach Listener Reference Handler Finalizer Signal Dispatcher DestroyJavaVM I am curious to understand purpose of each of these core JVM threads. From a quick internet search, I found the following details on these threads:
在我的机器上启动JVM实例时,使用一个在main()运行无限休眠的简单类,我在JVM中看到四个关键线程(除了主线程): 附上听众 参考处理程序 终结 信号调度器 DestroyJavaVM 我很想了解这些核心JVM线程的目的。 从快速的互联网搜索中,我发现了关于这些主题的以下细节: 附加监听器 :动态附加在目标JVM中有一个附加监听器线程。 这是在第一个附加请求发生时启动的线程。 信号调度程序 :当操作系统向JVM发出信号
I have an activity that only has a EditText. I want the soft keyboard to show up automatically. How can I do this? You can use this onResume: InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); imm.showSoftInput(((EditText) findViewById(R.id.your_view)),InputMethodManager.SHOW_FORCED); I suggest that you check if there is a Hardware keyboard before
我有一个只有EditText的活动。 我想让软键盘自动显示。 我怎样才能做到这一点? 你可以使用这个onResume: InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); imm.showSoftInput(((EditText) findViewById(R.id.your_view)),InputMethodManager.SHOW_FORCED); 我建议您在强制键盘出现之前检查是否有硬件键盘。 隐藏: ((InputMethodManager) YourActivity.this.getSystem
I have code to play an .ogg audio file, that I downloaded from the internet. I have no errors, so I can run it, but then the app crashes: package play.my.sound; import android.app.Activity; import android.media.AudioManager; import android.media.SoundPool; import android.media.SoundPool.OnLoadCompleteListener; import android.os.Bundle; import android.util.Log; import android.view.MotionEvent;
我有代码来播放.ogg音频文件,我从互联网上下载。 我没有错误,所以我可以运行它,但然后应用程序崩溃: package play.my.sound; import android.app.Activity; import android.media.AudioManager; import android.media.SoundPool; import android.media.SoundPool.OnLoadCompleteListener; import android.os.Bundle; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android
This question already has an answer here: Close/hide the Android Soft Keyboard 69 answers 请试试这个, InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); imm.toggleSoftInput(InputMethodManager.SHOW_FORCED,0); 尝试这样的事情: InputMethodManager imm = (InputMethodManager)getSystemService(MainActivity.this.INPUT_METHOD_SERVICE); imm.showSof
这个问题在这里已经有了答案: 关闭/隐藏Android软键盘69个答案 请试试这个, InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); imm.toggleSoftInput(InputMethodManager.SHOW_FORCED,0); 尝试这样的事情: InputMethodManager imm = (InputMethodManager)getSystemService(MainActivity.this.INPUT_METHOD_SERVICE); imm.showSoftInput(mainLayout.getWindowTok
This question already has an answer here: Close/hide the Android Soft Keyboard 69 answers Try editText.setInputType(EditorInfo.TYPE_NULL) Or ((EditText) findViewById(R.id.LoginNameEditText)).setFocusable(false); Or editText.setKeyListener(null); 尝试这个 : InputMethodManager imm =(InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE); imm.hideSoftInputFromWindow(myEditText.g
这个问题在这里已经有了答案: 关闭/隐藏Android软键盘69个答案 尝试 editText.setInputType(EditorInfo.TYPE_NULL) 要么 ((EditText) findViewById(R.id.LoginNameEditText)).setFocusable(false); 要么 editText.setKeyListener(null); 尝试这个 : InputMethodManager imm =(InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE); imm.hideSoftInputFromWindow(myEditText.getWindowToken(), 0); 尝
This question already has an answer here: How to validate an email address using a regular expression? 74 answers Real world email validation is not so primitive task and it was already solved many times. I'd suggest you not to re-invent the wheel but use Apache Commons EmailValidator. import java.util.regex.Matcher; import java.util.regex.Pattern; public class EmailValidator { p
这个问题在这里已经有了答案: 如何使用正则表达式验证电子邮件地址? 74个答案 真实世界的电子邮件验证不是很原始的任务,它已经解决了很多次。 我建议你不要重新发明轮子,而是使用Apache Commons EmailValidator。 import java.util.regex.Matcher; import java.util.regex.Pattern; public class EmailValidator { private Pattern pattern; private Matcher matcher; private static final String EMA
This question already has an answer here: How to validate an email address using a regular expression? 74 answers 尝试 String s = "*** test@gmail.com&&^ test2@gmail.com((& "; Matcher m = Pattern.compile("[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+").matcher(s); while (m.find()) { System.out.println(m.group()); } 只要删除^和$锚。
这个问题在这里已经有了答案: 如何使用正则表达式验证电子邮件地址? 74个答案 尝试 String s = "*** test@gmail.com&&^ test2@gmail.com((& "; Matcher m = Pattern.compile("[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+").matcher(s); while (m.find()) { System.out.println(m.group()); } 只要删除^和$锚。
There are multiple ways to produce email address Strings that differ with straight String comparison (see below), but are logically equivalent (ie mail sent to both goes to same mail box). This often allows users to give seemingly unique email addresses, even if strict equality was disallowed. I was hoping to find a library that would try to do normalization, to allow for finding some of dupli
有多种方式可以生成电子邮件地址字符串,这些字符串与直接字符串比较(参见下文)不同,但在逻辑上相同(即发送到两个邮件的邮件都发送到同一个邮箱)。 这通常允许用户提供看似独特的电子邮件地址,即使严格的平等不被允许。 我希望能够找到一个试图进行规范化的库,以便从大量电子邮件地址中找到一些重复项。 这里的目标是尽可能多地找到重复。 鉴于这是多么有用的多用途(在我的情况下,这是简单的滥用检测,因为滥用帐
We are often told that Regexps are slow and should be avoided whenever possible. However, taking into account the overhead of doing some string manipulation oneself (not talking about algorithm mistakes - this is a different matter), especially in PHP or Perl (maybe Java ) what is the limit, in which case can we consider string manipulation to be a better alternative? What regexps are particul
我们经常被告知Regexps很慢,应尽可能避免。 但是,考虑到自己做一些字符串操作的开销(不是在谈论算法错误 - 这是一个不同的问题),特别是在PHP或Perl (也许是Java )中有什么限制,在这种情况下,我们可以考虑字符串操作做一个更好的选择? 什么regexps特别是CPU贪婪? 例如,对于以下内容,在C++ , Java , PHP或Perl ,您会推荐什么 正则表达式可能会更快: s/abc/def/g或a ... while((i=index("abc",
We are using below regular expression to validate email address in java ^[\w!#\$'\*\+=\?\^\/_~-]+(\.[\w!#\$'\*\+=\?\^\/_~-]+)*@([a-zA-Z0-9\-]+\.)+[AZ]{2,4}$ and it worked fine with invalid email address raju.rathi@gmail.com&^(*&^(*^2 but when I use the same regular expression in javascript , it doesn't work and failes with even valid email addresses . Please suggest what could
我们使用下面的正则表达式来验证java中的电子邮件地址^[\w!#\$'\*\+=\?\^\/_~-]+(\.[\w!#\$'\*\+=\?\^\/_~-]+)*@([a-zA-Z0-9\-]+\.)+[AZ]{2,4}$ ,它工作正常与无效的电子邮件地址raju.rathi@gmail.com&^(*&^(*^2但是当我在JavaScript中使用相同的正则表达式,它不起作用并失去甚至有效的电子邮件地址。请建议可能是这种不匹配的根本原因? 例如在JavaScript中,我得到以下测试条件的虚假值 - /^[w!#$'