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Accessing members of items in a JSONArray with Java
I'm just getting started with using json with java. I'm not sure how to access string values within a JSONArray. For instance, my json looks like this:
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What does JVM flag CMSClassUnloadingEnabled actually do?
I cannot for the life of me find a definition of what the Java VM flag CMSClassUnloadingEnabled actually does, other than some very fuzzy high-level definitions such as "gets rid of your PermGen problems" ( which it doesn't , btw).
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Retrieve only static fields declared in Java class
...new ArrayList<Field>();
for (Field field : declaredFields) {
if (java.lang.reflect.Modifier.isStatic(field.getModifiers())) {
staticFields.add(field);
}
}
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Jackson and generic type reference
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This is a well-known problem with Java type erasure: T is just a type variable, and you must indicate actual class, usually as Class argument. Without such information, best that can be done is to use bounds; and plain T is roughly same as 'T extends Object'....
Why java classes do not inherit annotations from implemented interfaces?
...implementing class doesn't inherit the annotation as stated in Inherited's java doc:
2 Answers
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What's the (hidden) cost of Scala's lazy val?
...he scala mailing list and gives implementation details of lazy in terms of Java code (rather than bytecode):
class LazyTest {
lazy val msg = "Lazy"
}
is compiled to something equivalent to the following Java code:
class LazyTest {
public int bitmap$0;
private String msg;
public String m...
What is the difference between Collection and List in Java?
What is the difference between Collection and List in Java? When should I use which?
7 Answers
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Run a JAR file from the command line and specify classpath
...re)
Specify everything (including your jar) on the commandline using -cp:
java -cp MyJar.jar:lib/* com.somepackage.subpackage.Main
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What's with 181783497276652981 and 8682522807148012 in Random (Java 7)?
Why were 181783497276652981 and 8682522807148012 chosen in Random.java ?
3 Answers
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Java `final` method: what does it promise?
In a Java class a method can be defined to be final , to mark that this method may not be overridden:
5 Answers
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