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Sending a notification from a service in Android
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This type of Notification is deprecated as seen from documents:
@java.lang.Deprecated
public Notification(int icon, java.lang.CharSequence tickerText, long when) { /* compiled code */ }
public Notification(android.os.Parcel parcel) { /* compiled code */ }
@java.lang.Deprecated
public voi...
A quick and easy way to join array elements with a separator (the opposite of split) in Java [duplic
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Using Java 8 you can do this in a very clean way:
String.join(delimiter, elements);
This works in three ways:
1) directly specifying the elements
String joined1 = String.join(",", "a", "b", "c");
2) using arrays
String[] ar...
How should I escape strings in JSON?
...Utilities.escapeHtml , StringEscapeUtilities.escapeXml , or should I use java.net.URLEncoder ?
18 Answers
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What is the difference between == and equals() in Java?
...ich states that equal objects must have equal hash codes. (docs.oracle.com/javase/7/docs/api/java/lang/…)
– Abhijeet
Jul 6 '16 at 13:20
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What are the disadvantages to declaring Scala case classes?
... Person$.class and Person.class. If you disassemble Person$.class with the javap command, you’ll see that it contains an apply method, along with many others:
$ javap Person$
Compiled from "Person.scala"
public final class Person$ extends scala.runtime.AbstractFunction1 implements scala.ScalaObje...
How to generate a random alpha-numeric string?
I've been looking for a simple Java algorithm to generate a pseudo-random alpha-numeric string. In my situation it would be used as a unique session/key identifier that would "likely" be unique over 500K+ generation (my needs don't really require anything much more sophisticated).
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java.nio.file.Path for a classpath resource
...sspath resource (e.g. what I'd get from Class.getResource(String) ) as a java.nio.file.Path ? Ideally, I'd like to use the fancy new Path APIs with classpath resources.
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Does use of final keyword in Java improve the performance?
In Java we see lots of places where the final keyword can be used but its use is uncommon.
13 Answers
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How to check if a String is numeric in Java
...tils.isParsable which basically checks the number is parsable according to Java. (The linked javadocs contain detailed examples for each method.)
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Choose between ExecutorService's submit and ExecutorService's execute
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I mean 'wrapped in a Future or not', of course. See the Javadoc for ScheduledThreadPoolExecutor#execute, for example.
– rxg
Jun 13 '13 at 9:28
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