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How do I check if a file exists in Java?
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Using java.io.File:
File f = new File(filePathString);
if(f.exists() && !f.isDirectory()) {
// do something
}
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javac option to compile all java files under a given directory recursively
I am using the javac compiler to compile java files in my project. The files are distributed over several packages like this: com.vistas.util , com.vistas.converter , com.vistas.LineHelper , com.current.mdcontect .
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Why is spawning threads in Java EE container discouraged?
One of the first things I've learned about Java EE development is that I shouldn't spawn my own threads inside a Java EE container. But when I come to think about it, I don't know the reason.
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How can I convert a stack trace to a string?
...(PrintWriter pw) to send the stack trace to an appropriate writer.
import java.io.StringWriter;
import java.io.PrintWriter;
// ...
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
e.printStackTrace(pw);
String sStackTrace = sw.toString(); // stack trace as a string
Syst...
What is the difference between Tomcat, JBoss and Glassfish?
I am starting to look into Enterprise Java and the book I am following mentions that it will use JBoss. Netbeans ships with Glassfish. I have used Tomcat in the past.
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C++ STL Vectors: Get iterator from index?
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298
Try this:
vector<Type>::iterator nth = v.begin() + index;
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How to serialize an object into a string
...u still want to write it down into a String you can encode the bytes using java.util.Base64.
Still you should use CLOB as data type because you don't know how long the serialized data is going to be.
Here is a sample of how to use it.
import java.util.*;
import java.io.*;
/**
* Usage sample s...
How to get a thread and heap dump of a Java process on Windows that's not running in a console
I have a Java application that I run from a console which in turn executes an another Java process. I want to get a thread/heap dump of that child process.
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What is the difference between Serializable and Externalizable in Java?
What is the difference between Serializable and Externalizable in Java?
11 Answers
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When you exit a C application, is the malloc-ed memory automatically freed?
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I once encountered win98 on an embedded platform, and based off of that experience, I can say that it does NOT free memory when programs close.
– San Jacinto
Feb 6 '10 at 15:44
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