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This module contains review questions and answers keyed to the module titled Jb0200: Java OOP: Variables.

Revised: Mon Mar 28 13:31:46 CDT 2016

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Table of contents

Preface

This module contains review questions and answers keyed to the module titled Jb0200: Java OOP: Variables .

The questions and the answers are connected by hyperlinks to make it easy for you to navigate from the question to the answer and back again.

Questions

Question 1 .

Write a Java application that reads characters from the keyboard until encountering the # character. Echo each character to the screen as it is read.Terminate the program when the user enters the # character.

Answer 1

Question 2

What is the common name for the Java program element that is used to contain data that changes during the execution of the program?

Answer 2

Question 3

What must you do to make a variable available for use in a Java program?

Answer 3

Question 4

True or false? In Java, you are required to initialize the value of all variables when they are declared.

Answer 4

Question 5

Show the proper syntax for declaring two variables and initializing one of them using a single Java statement.

Answer 5

Question 6

True or false? The Java compiler will accept statements with type mismatches provided that a suitable type conversion can be implemented by the compiler atcompile time.

Answer 6

Question 7

Show the proper syntax for the declaration of a variable of type String[] in the argument list of the main method of a Java program and explain its purpose.

Answer 7

Question 8

Describe the purpose of the type definition in Java.

Answer 8

Question 9

True or false? Variables of type int can contain either signed or unsigned values.

Answer 9

Question 10

What is the important characteristic of type definitions in Java that strongly supports the concept of platform independence of compiled Java programs?

Answer 10

Question 11

What are the two major categories of types in Java?

Answer 11

Question 12

What is the maximum number of values that can be stored in a variable of a primitive type in Java?

Answer 12

Question 13

List the primitive types in Java.

Answer 13

Question 14

True or false? Java stores variables of type char according to the 8-bit extended ASCII table.

Answer 14

Question 15

True or false? In Java, the name of a primitive variable evaluates to the value stored in the variable.

Answer 15

Question 16

True or false? Variables of primitive data types in Java are true objects.

Answer 16

Question 17

Why do we care that variables of primitive types are not true objects?

Answer 17

Question 18

What is the name of the mechanism commonly used to convert variables of primitive types to true objects?

Answer 18

Question 19

How can you tell the difference between a primitive type and a wrapper for the primitive type when the two are spelled the same?

Questions & Answers

what is biology
Yousuf Reply
the study of living organisms and their interactions with one another and their environments
AI-Robot
the study of living organisms and their interactions with one another and their environment.
Wine
discuss the biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles in an essay form
Joseph Reply
what is the blood cells
Shaker Reply
list any five characteristics of the blood cells
Shaker
lack electricity and its more savely than electronic microscope because its naturally by using of light
Abdullahi Reply
advantage of electronic microscope is easily and clearly while disadvantage is dangerous because its electronic. advantage of light microscope is savely and naturally by sun while disadvantage is not easily,means its not sharp and not clear
Abdullahi
cell theory state that every organisms composed of one or more cell,cell is the basic unit of life
Abdullahi
is like gone fail us
DENG
cells is the basic structure and functions of all living things
Ramadan
What is classification
ISCONT Reply
is organisms that are similar into groups called tara
Yamosa
in what situation (s) would be the use of a scanning electron microscope be ideal and why?
Kenna Reply
A scanning electron microscope (SEM) is ideal for situations requiring high-resolution imaging of surfaces. It is commonly used in materials science, biology, and geology to examine the topography and composition of samples at a nanoscale level. SEM is particularly useful for studying fine details,
Hilary
cell is the building block of life.
Condoleezza Reply
what is cell divisoin?
Aron Reply
Diversity of living thing
ISCONT
what is cell division
Aron Reply
Cell division is the process by which a single cell divides into two or more daughter cells. It is a fundamental process in all living organisms and is essential for growth, development, and reproduction. Cell division can occur through either mitosis or meiosis.
AI-Robot
What is life?
Allison Reply
life is defined as any system capable of performing functions such as eating, metabolizing,excreting,breathing,moving,Growing,reproducing,and responding to external stimuli.
Mohamed
what is ecology
Philip Reply
study of interaction between living things and their environment
AI-Robot
the same
Menseh
ecology
Ahmed
so what are the sub topics under it
Lukmon
the draw of microscope and lebel it
Saidu Reply
What's atomic
John Reply
atomic? or atom🙄
joyce
related to or concerning an atom.
Nakita
what is biology?
Wine Reply
what are the important of biology?
Wine
what is Biology
Akech Reply
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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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