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What is the difference between a.getClass() and A.class in Java?
In Java what pros/cons exist surrounding the choice to use a.getClass() or A.class ? Either can be used wherever a Class<?> is expected, but I imagine that there would be performance or other subtle benefits to using both in different circumstances (just like there are with Class.forName...
Is there a way to access an iteration-counter in Java's for-each loop?
Is there a way in Java's for-each loop
15 Answers
15
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How to wait for a number of threads to complete?
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The book “Effective Java” recommends avoiding thread groups (item 73).
– Bastien Léonard
Aug 9 '09 at 20:47
2
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Choosing the best concurrency list in Java [closed]
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had better be List
The only List implementation in java.util.concurrent is CopyOnWriteArrayList. There's also the option of a synchronized list as Travis Webb mentions.
That said, are you sure you need it to be a List? There are a lot more options for concurrent Queues and M...
Wrapping chained method calls on a separate line in Eclipse for Java
...you exactly need is the following:
Windows: Window → Preferences → Java → Code Style
→ Formatter → Edit → Line wrapping (tab)
Mac OS: ADT → Preferences → Java → Code Style
→ Formatter → Edit → Line wrapping (tab)
Then, in the list at the left, select:
Fu...
What are “connecting characters” in Java identifiers?
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U+FE4F ﹏ WAVY LOW LINE
U+FF3F ＿ FULLWIDTH LOW LINE
This compiles on Java 7.
int _, ‿, ⁀, ⁔, ︳, ︴, ﹍, ﹎, ﹏, ＿;
An example. In this case tp is the name of a column and the value for a given row.
Column<Double> ︴tp︴ = table.getColumn("tp", double.class);
double...
Sorting HashMap by values [duplicate]
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Assuming Java, you could sort hashmap just like this:
public LinkedHashMap<Integer, String> sortHashMapByValues(
HashMap<Integer, String> passedMap) {
List<Integer> mapKeys = new ArrayList<>(passed...
Accept server's self-signed ssl certificate in Java client
...and import it in your JVM truststore (to establish a chain of trust):
<JAVA_HOME>\bin\keytool -import -v -trustcacerts
-alias server-alias -file server.cer
-keystore cacerts.jks -keypass changeit
-storepass changeit
Option 2
Disable Certificate Validation:
// Create a trust manager that ...
Implementation difference between Aggregation and Composition in Java
...tion and Composition. Can someone tell me the implementation difference in Java between them with examples?
9 Answers
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How to convert String to Long in Kotlin?
...o number conversion.
public inline fun String.toLong(radix: Int): Long = java.lang.Long.parseLong(this, checkRadix(radix))
4. string.toLongOrNull(10)
Parses the string as a [Long] number and returns the result or null
if the string is not a valid representation of a number.
@throws I...