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Java “user.dir” property - what exactly does it mean?
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It's the directory where java was run from, where you started the JVM. Does not have to be within the user's home directory. It can be anywhere where the user has permission to run java.
So if you cd into /somedir, then run your program, user.dir w...
File.separator vs FileSystem.getSeparator() vs System.getProperty(“file.separator”)?
...S, this functionality would allow you to use both (assuming I also wrote a Java Filesystem provider).
– Bringer128
Nov 10 '11 at 6:05
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Java Regex Capturing Groups
...: This order was placed for QT
group 2: 3000
group 3: ! OK?
More info on Java Pattern here.
Finally, the capturing groups are delimited by round brackets, and provide a very useful way to use back-references (amongst other things), once your Pattern is matched to the input.
In Java 6 groups ca...
Format an Integer using Java String Format
I am wondering if it is possible, using the String.format method in Java, to give an integer preceding zeros?
3 Answers
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How to initialize HashSet values by construction?
... Although most probably correct at the time of writing, as of Java 7 do use the Diamond operator as in: Set<String> h = new HashSet<>(Arrays.asList("a", "b")); public static final Set<String> MY_SET = new HashSet<>(Arrays.asList(SET_VALUES));
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Force point (“.”) as decimal separator in java
...nswer to the question and beside as programmer this is what I want. I want Java to use US locale by default as everywhere in my code where I actually need localisation I will make it explicit in my code. Just my habits perhaps but it is very annoying when printf/format uses my local Locale cause the...
Gradle, “sourceCompatibility” vs “targetCompatibility”?
...ity and sourceCompatibility maps to -target release and -source release in javac. Source is basically the source language level and target is the level of the bytecode that is generated.
More details can be found in the javac the cross compilation section.
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Is D a credible alternative to Java and C++? [closed]
Is the D language a credible alternative to Java and C++? What will it take to become a credible alternative? Should I bother learning it? Does it deserve evangelizing?
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Java: PrintStream to String?
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Use a ByteArrayOutputStream as a buffer:
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.nio.charset.StandardCharsets;
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
final String utf8 = StandardCharsets.UTF_8.name();
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How to pass an ArrayList to a varargs method parameter?
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@JoshM. Java needs a lot of things. ;) I also (coming from a C# background) miss index operators. Working with dictionaries is much more smooth in C# than working with HashMaps in Java.
– Per Lundberg
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