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How to get an enum value from a string value in Java?
...reated at compile time and do not appear in source code. They do appear in Javadoc, though; for example, Dialog.ModalityType shows both methods.
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How do I add a foreign key to an existing SQLite table?
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Please check https://www.sqlite.org/lang_altertable.html#otheralter
The only schema altering commands directly supported by SQLite are the
"rename table" and "add column" commands shown above. However,
applications can make other arbitrary changes to th...
Returning null as an int permitted with ternary operator but not if statement
Let's look at the simple Java code in the following snippet:
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Can I set enum start value in Java?
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Java enums are not like C or C++ enums, which are really just labels for integers.
Java enums are implemented more like classes - and they can even have multiple attributes.
public enum Ids {
OPEN(100), CLOSE(200);
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warning: [options] bootstrap class path not set in conjunction with -source 1.5
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From a blog post:
To use javac from JDK N to cross-compiler to an older platform version, the correct practice is to:
Use the older -source setting.
Set the bootclasspath to compile against the rt.jar (or equivalent) for the older platform....
Converting List to List
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Solution for Java 8. A bit longer than the Guava one, but at least you don't have to install a library.
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
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List<Integer> integers = Arrays.asL...
Java Garbage Collection Log messages
I have configured java to dump garbage collection information into the logs ( verbose GC ). I am unsure of what the garbage collection entries in the logs mean. A sample of these entries are posted below. I've searched around on Google and have not found solid explanations.
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How can I check if multiplying two numbers in Java will cause an overflow?
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Java 8 has Math.multiplyExact, Math.addExact etc. for ints and long. These throw an unchecked ArithmeticException on overflow.
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What is Double Brace initialization in Java?
What is Double Brace initialization syntax ( {{ ... }} ) in Java?
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No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
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On your Eclipse IDE, go into Window > Preferences > Java > Installed JREs > and check your installed JREs. You should have an entry with a JDK there.
Select the Execution Env as show below. Click OK
Then Right-Click on your Project -> Maven -> Update Project
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