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Elegant way to invert a map in Scala
... = Map(1 -> "one", 2 -> "two")
m: scala.collection.immutable.Map[Int,java.lang.String] = Map(1 -> one, 2 -> two)
scala> val reversedM = m map { case (k, v) => (v, k) }
reversedM: scala.collection.immutable.Map[java.lang.String,Int] = Map(one -> 1, two -> 2)
Note that dupli...
How to use the toString method in Java?
...rintln("mystr.toString: " + mystr.toString());
output:- mystr.toString: [Ljava.lang.String;@13aaa14a
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How can I check whether an array is null / empty?
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I am from .net background. However, java/c# are more/less same.
If you instantiate a non-primitive type (array in your case), it won't be null.
e.g. int[] numbers = new int[3];
In this case, the space is allocated & each of the element has a default value ...
Running Command Line in Java [duplicate]
Is there a way to run this command line within a Java application?
8 Answers
8
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Class.forName() vs ClassLoader.loadClass() - which to use for dynamic loading? [duplicate]
...alization, check sections 12.2 and 12.4 of the latest (3rd) edition of the Java Language Specification.
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Getting the name of the currently executing method
Is there a way to get the name of the currently executing method in Java?
22 Answers
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How to get VM arguments from inside of Java application?
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With this code you can get the JVM arguments:
import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
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RuntimeMXBean runtimeMxBean = ManagementFactory.getRuntimeMXBean();
List<String> arguments = runtimeMxBean.getInputArguments();
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Why would you ever implement finalize()?
I've been reading through a lot of the rookie Java questions on finalize() and find it kind of bewildering that no one has really made it plain that finalize() is an unreliable way to clean up resources. I saw someone comment that they use it to clean up Connections, which is really scary since t...
Why does this go into an infinite loop?
...eference with the ref keyword. I've decided to update it with actual legal Java code using the first MutableInt class I found on Google to sort of approximate what ref does in C#. I can't really tell if that helps or hurts the answer. I will say that I personally haven't done all that much Java deve...
How to map calculated properties with JPA and Hibernate
My Java bean has a childCount property. This property is not mapped to a database column . Instead, it should be calculated by the database with a COUNT() function operating on the join of my Java bean and its children. It would be even better if this property could be calculated on demand / "laz...