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What is the difference between Integer and int in Java?
... have any methods.
Integer is a class, no different from any other in the Java language. Variables of type Integer store references to Integer objects, just as with any other reference (object) type. Integer.parseInt("1") is a call to the static method parseInt from class Integer (note that this me...
How do you find the sum of all the numbers in an array in Java?
I'm having a problem finding the sum of all of the integers in an array in Java. I cannot find any useful method in the Math class for this.
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How to format a java.sql Timestamp for displaying?
How do I formate a java.sql Timestamp to my liking ? ( to a string, for display purposes)
7 Answers
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What is the difference between JDK and JRE?
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The JRE is the Java Runtime Environment. It is a package of everything necessary to run a compiled Java program, including the Java Virtual Machine (JVM), the Java Class Library, the java command, and other infrastructure. However, it canno...
Regex to check whether a string contains only numbers [duplicate]
...oted string is the letter 'd'. Try running '/^\d+$/' === '/^d+$/' in your JavaScript console. You need to double-escape when embedding a RegExp in a string: eval('/^\\d+$/')
– Mike Samuel
Oct 18 '13 at 4:49
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Function Pointers in Java
...he idea of function pointers from C++. Is there a similar functionality in Java? Given that pointers are somewhat absent, what is the best way about this? And to be clear, we're talking first class here.
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Groovy: what's the purpose of “def” in “def x = 0”?
...rts.
e.g. In this snippet I have to import FileChannel
// Groovy imports java.io.* and java.util.* automatically
// but not java.nio.*
import java.nio.channels.*
class Foo {
public void bar() {
FileChannel channel = new FileInputStream('Test.groovy').getChannel()
println chan...
Junit: splitting integration test and Unit tests
... <configuration>
<excludedGroups>java.io.Serializable</excludedGroups> <!-- An empty element doesn't overwrite, so I'm using an interface here which no one will ever use -->
</configuration>
</plugin&g...
Read/write to Windows registry using Java
How is it possible to read/write to the Windows registry using Java?
24 Answers
24
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:: (double colon) operator in Java 8
I was exploring the Java 8 source and found this particular part of code very surprising:
17 Answers
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