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Gayan Balasooriya

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 Java/J2EE articles from DevX.com

How to Schedule a Task to Start After a Defined Interval
Language: Java, Expertise: Intermediate - Learn how to schedule a task to begin after an assigned interval.

Taking Advantage of Immutable Objects in Java
Language: Java, Expertise: Intermediate - Integer and also Boolean are immutable; so, it is a bad idea to create objects that represent the same value, those classes have built-in caches for frequently used instances.

Performance Measurements with String Class Usage
Language: Java, Expertise: Intermediate - See how the new keyword definitely consumes more time when compared to direct initializing the value to a String object.

Wrapping Unbuffered Writes to an OutputStreamWriter in Java
Language: Java, Expertise: Intermediate - OutputStreamWriter uses memory for each call to its write() methods. Learn why you should wrap it in a BufferedWriter.

Identifying the Unicode of Characters in a Given String
Language: Java, Expertise: Intermediate - Learn how the String class facilitates finding the unicode of characters in a String.

Read the Contents of a JAR File Using Java
Language: Java, Expertise: Intermediate - Java provides a very easy mechanism to read jar files.

Do not Allow Critical Data to be Serialized
Language: Java, Expertise: Intermediate - Learn how to use the transient keyword for the variable that you do not want to be serialized.

Keeping Tabs on all Threads in Your Environment
Language: Java, Expertise: Intermediate - See how to monitor all of your threads in Java.  

Testing for String Equality
Language: Java, Expertise: Beginner See an example of the best way to check for string equality.

Palindrome Validation Using Java
Language: Java, Expertise: Intermediate - Learn to use the StringBuffer/Builder and the reverse method to get the string reversed.

Finding the Count of All Active Threads
Language: Java, Expertise: Intermediate - Learn how to return the count of all the active threads in the current run time.

Disabling AutoCommit in JDBC
Language: Java, Expertise: Intermediate - Learn why it is unwise to commit after every insert.

Understanding Lambda Expresssions with a Simple Method Call
Language: Java, Expertise: Intermediate - Lambda expressions have simplified the way we write code. Learn how to use a method from an interface.

Underscore Numerals in Java
Language: Java, Expertise: Intermediate - Using underscores for numerals is allowed in Java for better readability and representation.

How to Use Scanner to Receive Command Line Input
Language: Java, Expertise: Intermediate - Scanner is a simple and easy-to-use utility provided by Java.

Understanding Optional
Language: Java, Expertise: Intermediate - Get to know optional. This example can be fine-tuned as needed to explore all of the methods supported.

Using ThreadMXBean to Understand Threads
Language: Java, Expertise: Intermediate - Use this interface to learn more about the threads in your code.

Using valueOf() Instead of toString()
Language: Java, Expertise: Intermediate - See why the valueOf() method is useful when you do not know the value contained and it might throw a NullPointerException.

Java Collections Performance, MAP
Language: Java, Expertise: Intermediate - Improve Java performance with MAP.

New Way to Iterate a List in Java 8
Language: Java, Expertise: Intermediate - Learn a new way to iterate a list in Java 8.

Java Collections Performance, SET
Language: Java, Expertise: Intermediate - A set is a collection that contains no duplicate elements.

Making a File Read-only Using Java
Language: Java, Expertise: Intermediate - Explore how the setReadOnly() method works in Java.

Java Collections Performance, LISTS
Language: Java, Expertise: Intermediate - A list is an ordered collection of elements.

Java BlockingQueue
Language: Java, Expertise: Intermediate - Learn how to effectively use BlockingQueue in Java.

Using String.join to Concatenate Strings
Language: Java, Expertise: Intermediate - Learn to use this easy utility method in String class.


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