How to use volatile in Java ?

Volatie usage in java

Importance of transient in java

Importance of  Transient in java

Serialization in Java

Serialization in Java

We: Query to retrieve all second highest salary employee records

We: Query to retrieve all second highest salary employee records

java code to load and play media file

import javax.media.*;
import java.io.File;

import java.awt.*;
 
public class TrivialJMFPlayer extends Frame {

 
    public static void main (String[] args) {

        try {
            Frame f = new TrivialJMFPlayer();

            f.pack();

            f.setVisible (true);

        } catch (Exception e) {

            e.printStackTrace();

        }
    }
    public TrivialJMFPlayer() 

        throws java.io.IOException,

               java.net.MalformedURLException,
               javax.media.MediaException {

        FileDialog fd = new FileDialog

            (this, "TrivialJMFPlayer", FileDialog.LOAD);

        fd.setVisible(true);

        File f = new File(fd.getDirectory(), fd.getFile());

        Player p = Manager.createRealizedPlayer
            (f.toURI().toURL());

        Component c = p.getVisualComponent();

        add(c);
        p.start();

    }
}

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Java + How to create Synchronized Map ?

Hash Map class Structure

Class HashMap

java.lang.Object

java.util.AbstractMap

java.util.HashMap




Creating SynchronizedMap

Map m = Collections.synchronizedMap(new HashMap(...));

Points to remember about HashMap

1) Permits null values and the null key. 

2) HashMap class is equivalent to Hashtable, except that it is unsynchronized and permits nulls.

3) It does not guarantee that the order will remain constant over time

4) An instance of HashMap has two parameters that affect its  performance: initial capacity and      

    load factor. 

5) The capacity is the number of buckets in the hash table, and the initial capacity is simply the   

    capacity at the  time the hash table is created. 

6) The load factor is a measure of how full the hash table  is allowed to get before its capacity is 

    automatically increased.