2020 assesment

Question 1

Classify and List any 6 of the java primitive data types as numerics and non-numerics

Answer 1

Numerics (Int, byte, short, long) , Non-numerics ( char, Boolean)

Question 2

Define Declaration

Answer 2

A declaration statement associates a variable name with a type at compile time.
Ie. Int i= 0;

Question 3

define an identifier

Answer 3

*We use identifiers to name variables (and many other things) in Java.
i.e int a; int refers to data type, a is an identifier which is the name of the variable

Question 4

Define a literal

Answer 4

A literal is a source-code representation of a data-type value.
99 is a literal of type int .

Question 5

Define an expression

Answer 5

An expression is a literal, a variable, or a sequence of operations on literals and/or variables that produces a value.

e.g
* Int a= I + 1 is an expression

Question 6

c) Write a java program which prints the string hello world I am a new java programme

Answer 6

Write a java program which prints the string hello world I am a new java programme
Public class HelloWorld {
System.out.print.out(“ hello world”);
}
2 marks for correct class header, 2 marks for a print statement

Question 7

In Java programming language what does statement statically-typed mean?

Answer 7

which means that all variables must first be declared before they can be used.

Question 8

b) Explain the difference between an object and a class in Java

Answer 8

Class: A template that defines the properties (variables) and behavior (methods) of objects.
Object: An instance of a class that holds specific values for the properties defined in the class.