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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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Java code To convert byte to Hexadecimal
...m.out.println(sb.toString());
// prints "FF 00 01 02 03 "
See also
java.util.Formatter syntax
%[flags][width]conversion
Flag '0' - The result will be zero-padded
Width 2
Conversion 'X' - The result is formatted as a hexadecimal integer, uppercase
Looking at the text of the questio...
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...
Is there a common Java utility to break a list into batches?
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Check out Lists.partition(java.util.List, int) from Google Guava:
Returns consecutive sublists of a list, each of the same size (the final list may be smaller). For example, partitioning a list containing [a, b, c, d, e] with a partition size of 3...
What is the default initialization of an array in Java?
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Everything in a Java program not explicitly set to something by the programmer, is initialized to a zero value.
For references (anything that holds an object) that is null.
For int/short/byte/long that is a 0.
For float/double that is a ...
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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Is it OK to use == on enums in Java?
Is it OK to use == on enums in Java, or do I need to use .equals() ? In my testing, == always works, but I'm not sure if I'm guaranteed of that. In particular, there is no .clone() method on an enum, so I don't know if it is possible to get an enum for which .equals() would return a diffe...
Difference between the Apache HTTP Server and Apache Tomcat? [closed]
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Apache Tomcat is used to deploy your Java Servlets and JSPs. So in your Java project you can build your WAR (short for Web ARchive) file, and just drop it in the deploy directory in Tomcat.
So basically Apache is an HTTP Server, serving HTTP. Tomcat is a Servle...