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Gayan Balasooriya

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 Java/J2EE articles from DevX.com

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.

Calling Java Methods Using Lambda Expressions
Language: Java, Expertise: Intermediate - Explore a few expressions for calling Java methods.

UUID in Java
Language: Java, Expertise: Advanced - Learn to create a new random UUID.

Comparison of Arrays
Language: Java, Expertise: Intermediate - Easy code for comparing arrays in Java.

Timer in Java
Language: Java, Expertise: Intermediate - Explore how to create a task timer in Java.

Increasing the Size of an Array
Language: Java, Expertise: Intermediate - Learn how to increase the size of an array.

Reading Updated/Latest Value in Multithreading Environment
Language: Java, Expertise: Intermediate — Learn a good way to ensure that your variables show the most recently updated values.

Making a Java List Thread Safe
Language: Java, Expertise: Intermediate — The java.util.list is not thread safe by default. Learn a quick workaround to make your list thread safe.

Best Practices for Multithreading in Java
Get a glimpse at the basics of threads and multithreading and the best practices that should be adopted when working with multithreading in enterprise applications.

Creating a Spring Read Only and Native Query
Language: Enterprise, Expertise: Intermediate — For reading operations, the transaction configuration readOnly flag should be set to true and in order to execute native queries, the @Query annotation parameter, nativeQuery flag, should be set to true.

Accessing and Managing Third-Party Libraries
Learn about package management in your programming language and take advantage of all the goodness that's out there.

Using a JDBC Template
Language: Java, Expertise: Intermediate — Spring provides a nice abstraction on top of the JDBC API using JdbcTemplate and also provides great transaction management capabilities using annotation-based approach.

Understanding the Time Taken to Execute a Task
Language: Java, Expertise: Intermediate

Use the @RestController Annotation
Language: Enterprise Intermediate

Variable Argument Method


Failing Test After Time Expired in Mockito
Language: Enterprise||Expertise: Intermediate


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