Java

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• cloning Java objects
• creating a proxy objects
• speeding up EJB lookups
• ZIP compressing in Java
• writing a JUnit testcase
• serializing Java objects
• using Java logger
• looking up hostnames by IP in Java
• implementing a Queue in Java
• parsing XML files (DOM)
• reading files in java

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How to implement a Queue

This example shows how to implement a Queue in Java easily.

import java.util.LinkedList;

class Queue {   
  private LinkedList queue;

  public Queue() {
      queue = new LinkedList();
  }

  public void add(T obj) {
    queue.add(obj);    
  }

  public void removeFirst() {
    queue.removeFirst();      
  }

  public int size() {
      return queue.size();
  }
}

Note: if multiple threads can access the queue, the inner LinkedList should be synhronized: queue = (LinkedList) Collections.synchronizedList(queue)