J2EE-ACADEMY

An  Iterator  is an object that enables you to navigate through a collection and to remove elements from the collection selectively, if desired. You get an Iterator for a collection by calling its iterator method. The following is the Iterator interface . public interface Iterator<E> {     boolean hasNext();     E next();     void remove(); //optional } The  hasNext()  method returns  true  if the iteration has more elements, and the  next()  method returns the next element in the iteration.   The  remove()  method removes the last element that was returned by  next  from the underlying  Collection . The  remove  method may be called only once per call to  next  and throws an exception if this rule is violated. [ Note :  Iterator.remove  is the  only  safe way to modify a...

A brief history of java: James Gosling The history of Java Language is more interesting. The history of Java starts from “Green Project”. In 1991 The Green Project initiated by James Gosling , Mike Sheridan , and Patrick Naughton . A small group of Sun engineers called the "Green Team" believed that the next wave in computing was the union of digital consumer devices and computers. Led by James Gosling, the team worked around the clock and created the programming language that would revolutionize our world – Java.   The language was initially called Oak ( Oak is a symbol of strength and chosen as a national tree of many countries like U.S.A., France, Germany, Romania etc ). Later the project went by the name Green and was finally renamed Java , from Java coffee (produced in the Java, is an island of Indonesia).  Sun Microsystem s released the first public implementation as Java 1.0 in 1995. It promised "Write Once, Run Anywhere" (WORA), pr...

What is Java? The first released of Java on Jan 23, 1996 by Sun Microsystems. Java is a computer programming language. It is a widely used programming language. It is the most popular programming language for Android Smartphone. It’s known as a high-level language because it can be read and written easily by humans. Once a program has been written, the high-level instructions are translated into numeric codes that computers can understand and execute. It enables programmers to write computer instructions using English-based commands instead of having to write in numeric codes. Java was designed to have the look and feel of the  C++  language, but it is simpler to use than C++ and enforces an  object-oriented programming  model. Java can be used to create complete applications that may run on a single computer or be distributed among servers and clients in a network. It can also be used to build a small application module or...