tomboxfan

About data structure Hashtable is implemented using a linkedList array.  HashSet is implemented using a Hashtable. TreeSet is a sorted collection. It's implemented using a red-black tree. ...

  [Solution 1]java –version command after jdk1.6 can give you 32 bit or 64 bit info.Before jdk1.5, doesn’t contain this info. [Solution 2]In linux env, run this command to check . fi...

client sidejava_home/bin/jconsole.exe service:jmx:rmi:///jndi/rmi://192.168.***.***:8003/jmxrmiServer side add this parameter -Dcom.sun.management.jmxremote -Dcom.sun.management.jm...

The most important thing is: The jdk of server side and client side must be exactly the same. then in start command: remoteDebug="-Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport...

PATH is the environment variable. java.library.path is the system properties.  When the java application started, JVM will set java.library.path’s value using PATH’s value.In java program, i...

Q) How to start RMI Registry Server?A) 2 solutions.     Solution 1) From cmd window. Java/bin folder, use rmiregistry.exe                      If you call rmiregistry, it will start rmi server o...

     @Override  public boolean equals(Object object){  return EqualsBuilder.reflectionEquals(this, object);}   @Override  ...

public class RandomTest{      public static void main(String[] args)      {            Random rand1 = new Random(47);            Random rand2 = new Random(47);            for (int i = 0; i...

Readonly file can't be changed, and can be deleted.

How to load a properties?  Simply add the properties’ folder into the classpath, then load it in this way. private static Properties prop = new Properties();prop.load(Constants.class.getClas...

Unix env setupjflags="-ms1536M -mx1536M -Xnoclassgc"gcVerbose="-verbose:gc"jconsole="-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=8003 -Dcom.sun.management.jmxremote.authen...