palmerma的专栏

Hashtable是Dictionary的子类，HashMap是Map接口的一个实现类HashTable的应用非常广泛，HashMap是新框架中用来代替HashTable的类，也就是说建议使用HashMap，不要使用HashTable。可能你觉得HashTable很好用，为什么不用呢？这里简单分析他们的区别。1.HashTable的方法是同步的，HashMap未经同步，所以在多线程场合

The daemon thread's life cycle is same with the life cycle of the application which starts this daemon thread. If the application finishes, daemon threads are terminated at the same time. An example f

JAVA Deadlock example

Example of MySQL JAVA1. Download MySQL and run the server.2. Create one table in one database.3. Download JAVA jdbc jar, ex, mysql-connector-java-5.1.25, and import it in the JAVA project.

WeakReference:import java.lang.ref.WeakReference;public class WeakReferenceTest {    public static void main(String args[]) {        Person personB = new Person("B");        WeakRefe

The Most Widely Used Java Libraries            1. CoreApache Commons Lang – Apache’s library that provides a host of helper utilities for the java.lang API, such as String manipulation, object