Tips for Declaring Variables in Java

A variable is a container that holds values that are used in a Java program. To be able to use a variable it needs to be declared. Declaring variables is normally the first thing that happens in any program. How to Declare a Variable Java is a strongly typed programming language. This means that every variable must have a data type associated with it. For example, a variable could be declared to use one of the eight primitive data types: byte, short, int, long, float, double, char or boolean. A good analogy for a variable is to think of a bucket. We can fill it to a certain level, we can replace whats inside it, and sometimes we can add or take something away from it. When we declare a variable to use a data type its like putting a label on the bucket that says what it can be filled with. Lets say the label for the bucket is Sand. Once the label is attached, we can only ever add or remove sand from the bucket. Anytime we try and put anything else into it, we will get stopped by the bucket police. In Java, you can think of the compiler as the bucket police. It ensures that programmers declare and use variables properly. To declare a variable in Java, all that is needed is the data type followed by the variable name: int numberOfDays; In the above example, a variable called numberOfDays has been declared with a data type of int. Notice how the line ends with a semi-colon. The semi-colon tells the Java compiler that the declaration is complete. Now that it has been declared, numberOfDays can only ever hold values that match the definition of the data type (i.e., for an int data type the value can only be a whole number between -2,147,483,648 to 2,147,483,647). Declaring variables for other data types is exactly the same: byte nextInStream; short hour; long totalNumberOfStars; float reactionTime; double itemPrice; Initializing Variables Before a variable can be used it must be given an initial value. This is called initializing the variable. If we try to use a variable without first giving it a value: int numberOfDays; //try and add 10 to the value of numberOfDays numberOfDays numberOfDays 10; the compiler will throw an error: variable numberOfDays might not have been initialized To initialize a variable we use an assignment statement. An assignment statement follows the same pattern as an equation in mathematics (e.g., 2 2 4). There is a left side of the equation, a right side and an equals sign (i.e., ) in the middle. To give a variable a value, the left side is the name of the variable and the right side is the value: int numberOfDays; numberOfDays 7; In the above example, numberOfDays has been declared with a data type of int and has been giving an initial value of 7. We can now add ten to the value of numberOfDays because it has been initialized: int numberOfDays; numberOfDays 7; numberOfDays numberOfDays 10; System.out.println(numberOfDays); Typically, the initializing of a variable is done at the same time as its declaration: //declare the variable and give it a value all in one statement int numberOfDays 7; Choosing Variable Names The name given to a variable is known as an identifier. As the term suggests, the way the compiler knows which variables its dealing with is through the variables name. There are certain rules for identifiers: reserved words cannot be used.they cannot start with a digit but digits can be used after the first character (e.g., name1, n2ame are valid).they can start with a letter, an underscore (i.e., _) or a dollar sign (i.e., $).you cannot use other symbols or spaces (e.g., %,^,,#). Always give your variables meaningful identifiers. If a variable holds the price of a book, then call it something like bookPrice. If each variable has a name that makes it clear what its being used for, it will make finding errors in your programs a lot easier. Finally, there are naming conventions in Java that we  would encourage you to use. You may have noticed that all the examples we  have given follow a certain pattern. When more than one word is used in combination in a variable name the words following the first one are given a capital letter (e.g., reactionTime, numberOfDays.) This is known as mixed case and is the preferred choice for variable identifiers.

Should We Hold The Act Of Studying Higher For Worth Than...

(No title yet) One question I’ve struggled with throughout most of my high school career and even throughout the beginning of college was, â€Å"what is the correct balance between the â€Å"process† and the â€Å"destination†?† More bluntly and subjectively, â€Å"what is the correct balance between my grades and the learning process?† As a student I’ve always been told that learning is what matters. Everything else, including grades will follow suit. Teachers stress that putting forth all your attention on the task at hand – concentrated studying – creates success. They say that we as students, should value studying more than any summative value. Yet as a student I find this statement impossible. How can we hold the act of studying higher in worth than we†¦show more content†¦But attaining one’s goal is a step-by-step process – that is, it is solely a result of the journey. Additionally, the â€Å"journey† to ma ke this goal a reality is governed by the combination of the person you are at that moment, the aspiration to be the person you ought to be, and the â€Å"in-between† that we work on in trying to bridge the gap between the two. In other words, in the act of trying to reach our goal, we are governed by our evolving â€Å"character† – that is, this â€Å"character† being changed for better or for worse, by this process. Lastly, _____. Reaching one’s goals is a step-by-step process. Not many can say they’ve been able to accomplish their goal without taking the steps to get there. For often, to get from one side to the other requires the stepping across of many stones – not simply one large stride. For example, losing weight and sustaining that [that is not the right word], would be impossible without an articulated plan. However, when a healthy nutritional habit and lifestyle is implemented, losing weight becomes inevitable. Fishbach and Choi in their study of planned vs. actual exercise time, found that regardless of the activity, focusing on the result or goal of the activity decreased enjoyment in the activity and decreased the continued pursuit of the activity in the long run. Fishbach and Choi used four different studies, each study with a different activity, to support the idea that â€Å"attention to goals promotes behavioral intentionsShow MoreRelatedSelf Concept And Academic Success1 657 Words   |  7 Pagesis what lead me to begin this research for what was to becomes of my final paper for interpersonal communication. In a rather valiant second attempt at post graduate education I have personally come to enlighten my self-concept and indulge my self-worth in order to achieve positive success in furthering my education. Throughout my research I have chosen to embrace my ability in school by understanding and implementing the techniques necessary in providing a heightened sense of self-concept in orderRead MoreWhat I Would Never Have Believed That Concepts From Economics3977 Words   |  16 PagesAP course. The only reason why I was able to choose between these three courses was because of my grades. This is similar to the concept of â€Å"barriers to entry† in economics; the students are the new firms, the courses are the industries, and the different grades are the actual barrier into the courses. During sophomore year, I maintained an average grad e in the honors history course of higher than a B-. Because of this, I was able to maintain eligibility for the honors course and so choose theRead MoreProblems and Difficulties of Students3613 Words   |  15 Pagesof the most important factors in our life that every one of us must have. It serves as the beginning steps in achieving our goals in life, the basic training in facing the world business and experience to bring about learning. As our parents say, it is the best gift that we can get from them that no one can steal it. Thus, education is our investment to become our dreams turn to reality. We as student have our own dreams. When we are child we have already our dreams just like me. Before, whenRead More Brown v. Board of Education and Multiculturalism Essay2346 Words   |  10 Pagesin public schools. The decision, igniting fierce debates throughout the country, was met with violence and strong defiance in the South. The years after Brown, however, saw the passing of several important Acts: the Civil Rights Act of 1964, the Voting Rights Act of 1965, and the Fair Housing Act of 1968. Today, Americans remember Brown v. Board of Education as a success in African Americans’ struggle for equal rights, a change of sea tide for the civil rights movement. While Brown deserves its placeRead MoreCultural Comparison - Russia and US Education6674 Words   |  27 Pagesï » ¿ A Cultural Comparison of Higher Education in Russia and the United States of America Intercultural Communications August 19th, 2014 â€Å"Inculcation is the gradual coming to know something through mundane processes of training and learning† (Chetro-Szivos, J. Lecture 1). Through inculcation we acquire a set of dispositions that mold the body and eventually become second nature to the actor. Paralleling this concept withRead MoreFactors That Affect the Academic Performance of the Student Using Computer11401 Words   |  46 Pagesstatistical research is available for evaluating which type of training and teaching degree has the best effect on student achievement. As the demand for higher academic achievement and accountability in public education grows, it is important to determine whether teachers who hold advanced degrees in education as a general field are more effective than those who have degrees in specific subjects like English or math. http://www.heritage.org/research/reports/2000/09/cda00-09-effects-of-advanced-teacher-training-on-student-achievementRead MoreEssay on Bell Hooks Talking Back: Thinking Feminist, Thinking Black4090 Words   |  17 Pagesneeds.How can we transform consciousness if we do not have some sense of where the students are intellectually, psychically? (hooks Talking 54, emphasis mine). I agree with hooks that it is important to understand what our students need to à ¬transform consciousness.à ® At the same time, why must we force students to express themselves without giving them the chance to choose how? Is language really how we give our students a voice in the classroom? Hooks believes in order to give our students a voiceRead MoreEssay about Human Resource Management2982 Words   |  12 Pagesalways portrait to work as secretary, nurses or stayed at home taking care of the children’s, whereas men’s roles in society was to be the breadwinner. Kimmel’s findings shows that men’s main goal in the life was to succeed in their work and get a higher salary to provide for their families (kimmel, 1987). This shows men’s responsibilities were at work instead of home. This has not changed men at present are still the main breadwinners. Educations as well as occupational factors were found to impactRead MoreIs Having a Degree Importan t Pros and Cons6691 Words   |  27 PagesIs having a degree important pros and cons Is Getting A College Degree Worth It These Days? By: Brian Kim - August 28, 2007 I got the idea for this article after overhearing a conversation the other day between two teenagers. One was arguing that getting a degree was the only way to get a good job to make good money and the other was arguing that getting a degree wasn’t necessary in today’s day and age in order to make good money. I’m sure you or someone you know have had this debate at leastRead MoreThe Study of the Factors Influencing Students Attitudes Towards Learning Mathematics in the Junior Secondary School (a Case Study of Bwari Area Council, Fct Abuja)10704 Words   |  43 Pagesterms and concepts used will be explained as well as the motivation for the study. Finally, an overview of the research methodology to be used in the present study is explained. From home to the work place, mathematics tools have b+6ecome a part of our day-to-day life. In many circle of computer literacy, technological and mathematical competences are perceived as essential skills. Thus, schools have responded to this need for mathematical competence by enhancing their course offering in mathematics

Timber 2013 Major Folio Free Essays

Timber 2012/2013 Hsc major project folio Research Ergonomics How efficient will it be in a working environment? I have taken into consideration that I am a bit taller than other people, and after measuring all cabinets in my house they ranged from 900 mm to 950 mm and for me personally I considered them to be to small. Which is the reason I have chosen to make it to 1000mm. Design How did I come up with the design and why? Originally I started looking on the Internet and browsing through images but there were just so many options and I would not have known how to begin making them. We will write a custom essay sample on Timber 2013 Major Folio or any similar topic only for you Order Now During our theory lesson at school the teacher brought some magazines into the classroom, after reading through and getting some ideas I finally found a cabinet that captured my attention both because of the amazing look and the complexity of it, my design I very similar to the one that was in the magazine. I chose to make a cabinet as I noticed that one particular cabinet at my house is very bland and is starting to deteriorate due to its old age. Timber Selection What timber did I use and why? For the legs of my major project I have used Sydney Blue Gum as it is a hardwood timber that is more than capable of holding my job upright and also as I have used it before and have seen how it finishes. Glues What Glue/s have I used and why? Poly Vinyl Acetate (PVA) is the most common glue that I will be using as it is fast drying, dries clear, creates a strong bond between both timber surfaces and is easy to work with. Hardware What hardware has been used and why? Joints What joints have I used and why? Time Management Plan Week| Monday| Tuesday| Wednesday| Friday| 1| Designing Project – SketchingTheory| Designing Project – Sketching Theory| Designing Project – Adding DimensionsTheory| Selecting Timbers – Bought Blue Gum timber for LegsTheory | 2| Cut out legs 45mm X 45mmEach 1000mm long| | Marked and cut first curve on front legs| Roughly sanded curves with drum sander| 3| Marked and cut out second curve on front legs| Roughly sanded curves with drum sander| Problem – One of the curves was out significantly, new leg had to be made. Cut out new leg and cut curve on one side| 4| Cut second curve on leg and sanded on drum sander| | Major Project Portfolio explained and examples shownTheory| Cut all legs to precisely 1000mm| 5| Began sanding legs with 80 grit sandpaper| Sanding legs with 80 grit sandpaper| Sanding legs with 80 grit sandpaper| Sanding legs with 80 grit sandpaper| 6| Sanding legs with 80 grit sandpaper| | | | 7| | | | | 8| | | | | 9| | | | | 10| | | | | Mat erials List Material| Length (mm)| Width (mm)| Thickness (mm)| Estimated Cost| Cost| Sydney Blue Gum (Legs Top)| 1200| 300| 45| $90| $137| Jarrah (Door Frames)| | | 15| $45| | Maple (Draw Fronts)| 800| 140| 20| $20| | MDF (Back)| 900| 480| 3| | | | | | | | | | | | | | | Statement of intent Throughout this year and next I intend on designing and constructing a modern wooden cupboard. It will consist of two drawers up the top of the job and two doors with glass panels in them below. My goal is to make it perfectly with minimal complications or problems. I plan to achieve this by following my original designs and if need be small alterations might be made to ensure the job is up to a suitable standard. For the legs and the top of my job I plan on using Sydney blue gum as in previous years I have used it and personally I think it has a nice colour and finishes well. For the framing of the doors I plan on using some Jarrah as I think it will mix well with the Sydney blue gum and provide an amazing contrast of colors. For the draw fronts I plan on using a lighter material such as maple because it adds another colour that I think will look good. I also plan on putting frosted glass panels to add some extra complexity to it. I decided to make this particular design, as I think it is a practical piece of work that if made properly would serve me well throughout its life. Its main use will be for storing objects in the draws and bottles in the bottom compartment where the doors are. Throughout the process of making my project, I will be using various types of timber and tools to make up most of my job. I will also be using glue, nails and various joints to join all aspects of my job together. Classification of Timbers Sydney Blue Gum Hardwood or softwood – Sydney blue gum is a hard wood Botanical Name – Eucalyptus Saligna Origin – Blue Gum is found along the NSW coastline from Batemans Bay to Southern Queensland Appearance – The colour varies from soft pinks to dark pinks and dark reds Texture – The texture of this timber is moderately coarse and even Grain – The grain is straight or slightly interlocked in some cases Common uses – Joinery, Furniture, Domestic, Floor Boards, and Commercial Construction Jarrah Hardwood or Softwood – Jarrah is a Hardwood Botanical Name – Eucalyptus Marginata Origin – Jarrah grows in the Southwest corner of Western Australia Appearance – Heartwood varies from rich reds to deep browns; the Sapwood is a pale yellow colour Texture – The texture is relatively even but coarse Grain – The grain is generally straight but sometimes slightly interlocked producing a fiddle back figure Common Uses – Wharf and bridge construction, railway sleepers, framing, flooring, and joinery How to cite Timber 2013 Major Folio, Essay examples