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Reusing a PreparedStatement multiple times
...ill still be reduced.
To address the situation that you want to re-use the Java-side PreparedStatement, some JDBC drivers (such as Oracle) have a caching feature: If you create a PreparedStatement for the same SQL on the same connection, it will give you the same (cached) instance.
About multi-threa...
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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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;
//...
List<Integer> integers = Arrays.asL...
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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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 to create named and latest tag in Docker?
...atest
docker images | grep ${IMAGE}
docker run --rm ${IMAGE}:latest /opt/java7/bin/java -version
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What's the difference between ISO 8601 and RFC 3339 Date Formats?
...mandates it tools.ietf.org/html/rfc3339#page-12
– Java Guy
Nov 1 '12 at 2:26
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How do I reverse an int array in Java?
I am trying to reverse an int array in Java.
43 Answers
43
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What is Double Brace initialization in Java?
What is Double Brace initialization syntax ( {{ ... }} ) in Java?
13 Answers
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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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