Code & Cluster

Lambdas are the biggest addition to JAVA in not just release 8 but several releases. But when you look at the cryptic lambda syntax, like m...

The java.lang.Comparable and java.util.Comparator interfaces provide similar function and there is sometimes confusion as to which interf...

Serializable and Externalizable are almost forgotten interfaces in Java. And for good reason. Many applications do not need to serialize ob...

How do you write a method to convert a generic collection to an Array ? A naive implementation would be: public static <T> T[] con...

Java language has supported enum type for several releases. Yet, many programmers do not use it or do not fully understand all features of ...

Prior to JDK 5, the only way to protect data from concurrent access was to use the synchronized keyword. The limitations of using synchroni...

Consider the merge method below that copies all elements from List source to List target. public static <T> void merge(List<? supe...

Generics is one of those more complicated language features in Java that is not well understood by many programmers. Many avoid it altogethe...

The old way of creating threads in Java was to extend the java.lang.Thread class or to implement the java.lang.Runnable interface and pass i...

In Object oriented programming, inheritance is concept that lets programmers re-use code as well specialize existing code. In Java, a class,...

Spring MVC enables easy web application development with a framework based on the Model View Controller architecture (MVC) pattern. The MVC ...

In "The promise of spring" I talked about some of the benefits of Spring, one of which is the simplification of the usage of JDBC...

The Spring framework  is a popular alternative to J2EE for enterprise application development.  To download Spring or read about it, visit h...

The Java memory model describes the rules that define how variables written to memory are seen, when such variables are written and read by ...

Consider the problem where one thread produces some data and other threads consume the data. This is the producer consumer pattern. If the p...

The problem with double check locking in java is well documented. Yet even a seasoned programmer can get overzealous trying to optimize sync...