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Abstract class in Java
What is an "abstract class" in Java?
14 Answers
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What is boxing and unboxing and what are the trade offs?
...e the expected metadata and structure that other data structures have.
In Java and Haskell generic collections can't contain unboxed values. Generic collections in .NET can hold unboxed values with no penalties. Where Java's generics are only used for compile-time type checking, .NET will generat...
Java Generate Random Number Between Two Given Values [duplicate]
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With respect to the Java naming convention the variable names should start with lower case character
– Jens
May 19 '17 at 8:13
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If strings are immutable in .NET, then why does Substring take O(n) time?
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It would be interesting to contrast how Java does (or at least did at some point in the past) it: Substring returns a new string, but pointing at the same char[] as the larger string - that means that the larger char[] can no longer be garbage collected until the s...
How can I give the Intellij compiler more heap space?
...ss heap size.
Older versions:
Settings (Preferences on Mac) | Compiler | Java Compiler | Maximum heap size.
Compiler runs in a separate JVM by default so IDEA heap settings that you set in idea.vmoptions have no effect on the compiler.
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How can I make a multipart/form-data POST request using Java?
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These are the Maven dependencies I have.
Java Code:
HttpClient httpclient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
FileBody uploadFilePart = new FileBody(uploadFile);
MultipartEntity reqEntity = new MultipartEntity();
reqEntity.addPart("up...
Java: Check if enum contains a given string?
... should never be used for ordinary control flow" (Joshua Bloch, "Effective Java").
– james.garriss
May 20 '14 at 16:34
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How can I truncate a double to only two decimal places in Java?
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If you want that for display purposes, use java.text.DecimalFormat:
new DecimalFormat("#.##").format(dblVar);
If you need it for calculations, use java.lang.Math:
Math.floor(value * 100) / 100;
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Using Java 8 to convert a list of objects into a string obtained from the toString() method
There are a lot of useful new things in Java 8. E.g., I can iterate with a stream over a list of objects and then sum the values from a specific field of the Object 's instances. E.g.
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How do HashTables deal with collisions?
...tions which if you are lucky might send the objects to different buckets.
Java uses both option 1 and 2 in its hash table implementations.
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