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Get OS-level system information
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The java.lang.management package does give you a whole lot more info than Runtime - for example it will give you heap memory (ManagementFactory.getMemoryMXBean().getHeapMemoryUsage()) separate from non-heap memory (ManagementFactory.g...
Why does InetAddress.isReachable return false, when I can ping the IP address?
...o this :
// in case of Linux change the 'n' to 'c'
Process p1 = java.lang.Runtime.getRuntime().exec("ping -n 1 www.google.com");
int returnVal = p1.waitFor();
boolean reachable = (returnVal==0);
The -c option of ping will allow ping to simply try to reach the server once(as opposed t...
How to split a string in Java
...od in the String class.
https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#split-java.lang.String-int-
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jQuery If DIV Doesn't Have Class “x”
...l1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.1/jquery.min.js"></script>
<title>Sandbox</title>
<meta http-equiv="Content-type" content="text/html...
Convert String to equivalent Enum value
... yes thanks just saw this download.oracle.com/javase/1,5.0/docs/api/java/lang/Enum.html
– Ankur
Aug 14 '11 at 13:11
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How do I count the number of occurrences of a char in a String?
...ches("a.b.c.d", ".");
Why write it yourself when it's already in commons lang?
Spring Framework's oneliner for this is:
int occurance = StringUtils.countOccurrencesOf("a.b.c.d", ".");
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How to properly override clone method?
... here's what you can do in this case: make sure that MyObject extends java.lang.Object implements java.lang.Cloneable. If that's the case, then you can guarantee that you will NEVER catch a CloneNotSupportedException. Throwing AssertionError as some have suggested seems reasonable, but you can also ...
In mongoDb, how do you remove an array element by its index?
...quires that your dictionary be strictly ordered. The dictionaries in most languages are unordered, so it can be a pain to make this happen.
– Glenn Maynard
Jul 15 '13 at 21:34
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Where is Java's Array indexOf?
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Array has no indexOf() method.
Maybe this Apache Commons Lang ArrayUtils method is what you are looking for
import org.apache.commons.lang3.ArrayUtils;
String[] colours = { "Red", "Orange", "Yellow", "Green" };
int indexOfYellow = ArrayUtils.indexOf(colours, "Yellow");
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Convert java.util.Date to String
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Commons-lang DateFormatUtils is full of goodies (if you have commons-lang in your classpath)
//Formats a date/time into a specific pattern
DateFormatUtils.format(yourDate, "yyyy-MM-dd HH:mm:SS");
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