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What causes java.lang.IncompatibleClassChangeError?
I'm packaging a Java library as a JAR, and it's throwing many java.lang.IncompatibleClassChangeError s when I try to invoke methods from it. These errors seem to appear at random. What kinds of problems could be causing this error?
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“java.lang.OutOfMemoryError : unable to create new native Thread”
We are getting "java.lang.OutOfMemoryError : unable to create new native Thread " on 8GB RAM VM after 32k threads (ps -eLF| grep -c java)
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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...
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...
replace String with another in java
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Try this:
https://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html#replace%28java.lang.CharSequence,%20java.lang.CharSequence%29
String a = "HelloBrother How are you!";
String r = a.replace("HelloBrother","Brother");
System.out.println(r);
This...
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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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...
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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Getting random numbers in Java [duplicate]
I would like to get a random value between 1 to 50 in Java.
2 Answers
2
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