UOW Week 2

Question 1

public

Answer 1

is an access specifier that indicates that main() is visible

outside the class

Question 2

static

Answer 2

static indicates that you can call the method without creating an instance of a class

Question 3

main

Answer 3

main is the method where the program starts

Question 4

what are the roles or the java compilier and jvm?

Answer 4

java compiler converts source code (xxx.java)to byte code instructions, saved as xxx.class, JVM converts byte code to machine code,

Question 5

How do programs communicate?

Answer 5

Everything is under the control of the operating system, programs communicates by making system calls

Question 6

void

Answer 6

indicates the method does not return any information

Question 7

What are the 6 main types of variables?

Answer 7

int, float, double, char, string, boolean

Question 8

what are +. -, *. / called in java

Answer 8

arithmetic operators and expressions

Question 9

What is the purpose of the UML?

Answer 9

Used to understand the flow of programs and allow visualization to cover conceptual ideas

Question 10

what is the printf() method?

Answer 10

a flexible way to output numbers, characters and text in a specific format using only one statement

printf(“%f miles equal to %f kilometres \n”, miles, kms);

Question 11

what is the purpose of the enun data type?

Answer 11

to define collections of constants

Question 12

How to creat an object in java?

Answer 12

Circle res = new Circle(radius);

Question 13

What are methods?

Answer 13

A method is a block of statements that can be executed by calling it from some other place in the program

Question 14

What is a method of parameters?

Answer 14

Information can be passed into a method by using parameters which as a variables inside the method