Page 76 - Viva ICSE Computer Studies 8 : E-book

Tech Terms

Class: A collection of similar objects

Data Type: A means of storing any variable or constant
Encapsulation: Wrapping of data and functions in an object or class

Inheritance: A process by which an object of one class (base class) can inherit the properties of
another class (derived class)
Object: A single unit that stores data and functions
Polymorphism: An ability of objects to exhibit diff erent behaviours in diff erent instances

Quick Recall

• BIueJ is an Integrated Development Environment (IDE) for beginners to write, edit and execute
the Java program.
• A class is a collection of similar objects.
• Abstraction means to ignore the unnecessary details of an object and access essential details.

• A token is the smallest element of a program that is meaningful to the compiler.
• Keywords are words that have already been defi ned for Java compiler.

• Constants in Java are fi xed values those are not changed during the execution of a program.
• Variables are the identifi ers of the memory location, which are used to save data temporarily for
later use in a program.
• Arithmetic operators are +, –, , / and %.
*
• Increment and decrement operators are ++ and –– respectively.
• Relational operators are >, <, ==, !=, >= and <=.
• Logical operators are &&, II and !.

A. Fill in the blanks.

1. A ______________ is used to write the programs.

2. ______________ is a real-world entity.
3. A ______________ is the blueprint of an object.

4. A ______________ is the smallest element of a program.
5. A ______________ is used to save data temporarily for later use in a program.

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