Core Java (All)

Java Core - Additional Important Concepts for Exams and Interviews

Important concepts that can help you with core Java interviews and exams.

ArrayList Class Basic Concepts

ArrayList is a resizable-array implementation of the List interface.

Traversing, Comparing and Copying Arrays

Traversing arrays

Traversing an array is the process of visiting each element of an array.

Two common ways to traverse an array are:

  • simple for loop / while loop

  • for-each loop

 

Example array

int[] myArray = {1,2,3,4,5}

 

Java Version History

Like in movies, going through some flash back through the history can help us understand the present better.

  • JDK Beta – 1995

  • JDK 1.0 – January 1996

  • JDK 1.1 – February 1997

  • J2SE 1.2 – December 1998

  • J2SE 1.3 – May 2000

  • J2SE 1.4 – February 2002

  • J2SE 5.0 – September 2004

  • Java SE 6 – December 2006

  • Java SE 7 – July 2011

  • Java SE 8 – March 2014

  • Java SE 9 – September 2017

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