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Why do people still use primitive types in Java?
Since Java 5, we've had boxing/unboxing of primitive types so that int is wrapped to be java.lang.Integer , and so and and so forth.
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Exact difference between CharSequence and String in java [duplicate]
...you pasted: simply compile that, and have a look at the JVM bytecode using javap -v. There you will notice that both obj and str are references to the same constant object. As a String is immutable, this kind of sharing is all right.
The + operator of String is compiled as invocations of various St...
Comparing two java.util.Dates to see if they are in the same day
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Joda-Time
As for adding a dependency, I'm afraid the java.util.Date & .Calendar really are so bad that the first thing I do to any new project is add the Joda-Time library. In Java 8 you can use the new java.time package, inspired by Joda-Time.
The core of Joda-Time is the...
How do I set environment variables from Java?
How do I set environment variables from Java? I see that I can do this for subprocesses using ProcessBuilder . I have several subprocesses to start, though, so I'd rather modify the current process's environment and let the subprocesses inherit it.
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fastest (low latency) method for Inter Process Communication between Java and C/C++
I have a Java app, connecting through TCP socket to a "server" developed in C/C++.
10 Answers
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How to handle invalid SSL certificates with Apache HttpClient? [duplicate]
...st store that includes your cert
Add the cert for that site to the default java trust store.
Here is a sample program that creates a (mostly worthless) SSL Context that accepts any cert:
import java.net.URL;
import java.security.SecureRandom;
import java.security.cert.CertificateException;
import...
Java Logging vs Log4J [closed]
Is it still worth to add the log4j library to a Java 5 project just to log
let's say some exceptions to a file with some nice rollover settings.
Or will the standard util.logging facility do the job as well?
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Immutable array in Java
Is there an immutable alternative to the primitive arrays in Java? Making a primitive array final doesn't actually prevent one from doing something like
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StringBuilder vs String concatenation in toString() in Java
...e spec is: To increase the performance of repeated string concatenation, a Java compiler _may_ use the StringBuffer class or a similar technique to reduce the number of intermediate String objects that are created by evaluation of an expression. The key word there being may. Given that this is offi...
How to create empty folder in java? [duplicate]
...le you use the .mkdirs() method on a File object: http://www.roseindia.net/java/beginners/java-create-directory.shtml
// Create a directory; all non-existent ancestor directories are
// automatically created
success = (new File("../potentially/long/pathname/without/all/dirs")).mkdirs();
if (!succes...