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How do SQL EXISTS statements work?
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Think of it this way:
For 'each' row from Suppliers, check if there 'exists' a row in the Ord...
What is the JavaScript version of sleep()?
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Dan DascalescuDan Dascalescu
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Getting exact error type in from DbValidationException
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98
If you don't have a catch block, you can replace ex with $exception and get the same result.
– Ecyrb
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Java current machine name and logged in user?
...("user.name"); //platform independent
and the hostname of the machine:
java.net.InetAddress localMachine = java.net.InetAddress.getLocalHost();
System.out.println("Hostname of local machine: " + localMachine.getHostName());
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Is there a Mutex in Java?
Is there a Mutex object in java or a way to create one?
I am asking because a Semaphore object initialized with 1 permit does not help me.
Think of this case:
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A 'for' loop to iterate over an enum in Java
I have an enum in Java for the cardinal & intermediate directions:
11 Answers
11
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What is a JavaBean exactly?
I understood, I think, that a "Bean" is a Java class with properties and getters/setters. As much as I understand, it is the equivalent of a C struct. Is that true?
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Java Desktop application: SWT vs. Swing [closed]
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Pros Swing:
part of java library, no need for
additional native libraries
works the same way on all platforms
Integrated GUI Editor in Netbeans and Eclipse
good online tutorials by Sun/Oracle
Supported by official java extensions (like java Open...
CATALINA_OPTS vs JAVA_OPTS - What is the difference?
... out the difference between Apache Tomcat variables - CATALINA_OPTS and JAVA_OPTS in SO and surprised to see that there is no question/answer posted here yet. So I thought of sharing it here (with answer) after finding out the difference. Check the answer/difference below.
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What is null in Java?
...hat it's "merely a special literal that can be of any reference type".
In Java, null == null (this isn't always the case in other languages). Note also that by contract, it also has this special property (from java.lang.Object):
public boolean equals(Object obj)
For any non-null reference ...