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PREFACE
These days, the computer has become a necessity. Almost every task can be performed using a
computer. To understand this wonderful device, computer science was introduced in the school
curriculum. Nowadays, computer science is not limited to definitions and commands. It has changed
how we carry out our everyday tasks.
Touchpad Computer Science series is comprehensively designed as per the new ISC syllabus for
classes XI and XII.
Programming is one of the most important skills that individuals can learn to improve their skillsets
and become successful in their lives. This book will help the students to learn programming in an
effective and interactive manner. This book contains an ample amount of interactive programs for the
students to practice and learn programming. This book will help the students to learn the fundamental
concepts of Object-Oriented Programming in Java. The programs are designed to develop the learner’s
analytical thinking so that they are able to understand and develop programs on their own.
To help the student understand the concept of programming, the codes are written clearly and neatly
with line numbers and proper indents. These programs have been executed in the BlueJ Development
Environment. All the codes are accompanied by their outputs. These codes are presented as they
appear on the BlueJ platform. All the keywords appearing in the code are coloured as they appear on
the platform respectively. This book also contains sample question papers to provide the learners with
a grasp of what the question paper looks like. The book also contains previous year’s questions from
the past decade to cover as many questions and their variations.
We hope the book contributes to the progressive development of the computer-aided education
system and prepares our learners for all upcoming challenges. We want the learners to learn the
concepts not only for the purpose of gaining knowledge but also to be able to find their applications.
This will enable them to enrich the quality of their lives as well as of others.
—Authors
Satarupa Dasgupta
St. Xavier’s Institution
Panihati, Kolkata
Partha Saha
St. Xavier’s Institution
Panihati, Kolkata

