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Why would a static nested interface be used in Java?
...were public, or if the class were hand-assembled or compiled from some non-Java language, etc. The Java compiler, however, checks the access modifier on the enclosing class even when the resulting bytecode would not refer to that enclosing class.
– Jesse Glick
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Best way to convert an ArrayList to a string
...tring);
In fact, a string concatenation is going to be just fine, as the javac compiler will optimize the string concatenation as a series of append operations on a StringBuilder anyway. Here's a part of the disassembly of the bytecode from the for loop from the above program:
61: new #13; //...
Set environment variables on Mac OS X Lion
...ust add, one per line, the variable name and its value as follows:
export JAVA_HOME=/Library/Java/Home
export JRE_HOME=/Library/Java/Home
etc.
If you are modifying your "PATH" variable, be sure to include the system's default PATH that was already set for you:
export PATH=$PATH:/path/to/my/stuf...
Does java.util.List.isEmpty() check if the list itself is null? [duplicate]
Does java.util.List.isEmpty() check if the list itself is null , or do I have to do this check myself?
8 Answers
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Checking if a string is empty or null in Java [duplicate]
...tring which consists of spaces or special characters eg " " empty too. See java.lang.Character.isWhitespace API
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Get Android .apk file VersionName or VersionCode WITHOUT installing apk
...red from the following topic: Efficient way to compare version strings in Java
/**
* Compare 2 version strings and tell if the first is higher, equal or lower
* Source: https://stackoverflow.com/questions/6701948/efficient-way-to-compare-version-strings-in-java
*
* @param ver1 Reference versi...
How do I instantiate a Queue object in java?
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java.util.Queue is an interface. You can't instantiate interfaces. You need to create an instance of a class implementing that interface. In this case a LinkedList is such a class.
– Mihai Toader
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How do you get the “object reference” of an object in java when toString() and hashCode() have been
I would like to print the "object reference" of an object in Java for debugging purposes.
I.e. to make sure that the object is the same (or different) depending on the situation.
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How do I call some blocking method with a timeout in Java?
Is there a standard nice way to call a blocking method with a timeout in Java? I want to be able to do:
10 Answers
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Calling virtual functions inside constructors
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−1 "is dangerous", no, it's dangerous in Java, where downcalls can happen; the C++ rules remove the danger through a pretty expensive mechanism.
– Cheers and hth. - Alf
Aug 14 '16 at 10:47
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