5/3/2006. Today! HelloWorld in BlueJ. HelloWorld in BlueJ, Cont. HelloWorld in BlueJ, Cont. HelloWorld in BlueJ, Cont. HelloWorld in BlueJ, Cont.

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1 Today! Build HelloWorld yourself in BlueJ and Eclipse. Look at all the Java keywords. Primitive Types. HelloWorld in BlueJ 1. Find BlueJ in the start menu, but start the Select VM program instead (you will only need to do this once for every installation of BlueJ.) 2. Make sure the JDK selected is version or better. If it is not, you may have to open the bottom of the window and browse or search for a newer JDK. If you can t find one, you will need to install a newer JDK from java.sun.com. 3. Close this window, and start BlueJ as you normally would. Spring 2006 CISC101 - Prof. McLeod 1 Spring 2006 CISC101 - Prof. McLeod 2 4. Click on Project, then New Project. 5. Browse to a convenient folder (where you can find the project again), and type in a name for the Project don t use any spaces (always a good idea with Java filenames and folders!). 6. Click on Create to close the New Project window. The new project name is now at the top of the window. 7. Click on the New Class button at the left. 8. Type in the class s name: HelloWorld and leave the class checked off. 9. Click on OK to close the New Class window. 10.You can now see a new little box representing your class. You can enlarge the box and/or drag it around the screen (entertaining, but not useful!). 11.Double click on the little box, to open the code editor window. 12.Delete all the junk in the editor window by pressing <Cntrl>A followed by <Del>. We don t need all this stuff! (code auto-generation ). Spring 2006 CISC101 - Prof. McLeod 3 Spring 2006 CISC101 - Prof. McLeod Type in the class container code: public class HelloWorld { } 14.Save your program by typing <Cntrl>s or go to Class then choose Save. (Save your code often!!!) 15.You can choose to add a comment at the top of your program, and another comment by the } : // My very first Java program! // By me! public class HelloWorld { } // end HelloWorld Spring 2006 CISC101 - Prof. McLeod 5 Spring 2006 CISC101 - Prof. McLeod 6 1

2 16.Add the container for the main method: // My very first Java program! // By me! public class HelloWorld { public static void main (String[] args) { } // end main } // end HelloWorld 17.Save your program again. Note message at bottom right corner saying Saved. 18.Click on the Compile at the top left. Fix any compilation errors. 19.Just in case you did not have any make an error (like removing a } or { ) and compile again to see what happens. Click on the? to see a semi-useful message about the compilation error. 20. Fix all errors and re-compile. Spring 2006 CISC101 - Prof. McLeod 7 Spring 2006 CISC101 - Prof. McLeod 8 21.Leave the editor window open, but move to the original Project window. Note how the box looks different if your class has not been compiled. You cannot run your program until it has been compiled. 22.Right click on your little box and choose void main(string[] args) to run your program. 23.Click on OK without changing any parameters in the little text box. 24. Nothing happens right? 25.Our program did what we told it to do nothing!! 26.Go back to the editor window and add the following output statement: System.out.println("Hello World!"); 27.Save, compile, and then run your program, as before. (Always, always Save before running!) Spring 2006 CISC101 - Prof. McLeod 9 Spring 2006 CISC101 - Prof. McLeod You should see the following little exciting window called the Terminal or Console window: 29.On your own, from the project window, choose Help then BlueJ Tutorial, if you wish to know more. Spring 2006 CISC101 - Prof. McLeod 11 HelloWorld in Eclipse 1. The first time you start Eclipse, you will see the Welcome page. You should check out some of the information here particularly one of the simple Tutorials and the Overview. 2. For now, click on the Workbench link at the top right. 3. Before proceeding, and for the first time only, you should check the configuration of the program, to make sure it is running the correct Java JDK. Spring 2006 CISC101 - Prof. McLeod 12 2

3 4. In the top menu bar, go to Window then Preferences. 5. Click on the + beside Java and then choose Installed JRE s. You should see the window on the following slide: Spring 2006 CISC101 - Prof. McLeod 13 Spring 2006 CISC101 - Prof. McLeod Make sure the JRE is checked off. 7. Now choose Compiler and make sure the Compiler Compliance Level is set to You should see the following window: Spring 2006 CISC101 - Prof. McLeod 15 Spring 2006 CISC101 - Prof. McLeod There are lots of other options in Preferences but we do not have to worry about any of them right now! 10.Click on OK to close the Preferences window. This might take a little while and if you are asked to re-compile, say OK. 11.Just as in BlueJ, you need to create a new project. Projects can contain many java files, however. Click on the little folder thing at the top left: 12. Click on Project you will see the Project creation wizard: 13.Click on the Next > button. Spring 2006 CISC101 - Prof. McLeod 17 Spring 2006 CISC101 - Prof. McLeod 18 3

4 14.On this screen enter a name for your project. You will see: 15. Click on Finish. 16.Your new project will now be listed at the left in the Package Explorer. Click on the + beside the project s name. 17.There is a link to the JRE System Library, that we are going to ignore. 18.Click on that little folder thing at the top left, and choose Class this time to start the New Java Class wizard. You should see the window on the next slide: Spring 2006 CISC101 - Prof. McLeod 19 Spring 2006 CISC101 - Prof. McLeod Type in HelloWorld for the name of your class. Make sure the method stub checkbox for main is checked (to make your life easier!). 20.Click on Finish and your new class will show up in the editor window. 21. Delete comments and/or add your own. 22.Add the System.out.println() line inside the main method, as you did before. 23.You will notice some advanced editor features when you hit period for example, and other things such as auto indentation. 24.Save your program using <Cntrl>s or by clicking on the little floppy disk button at the top left. Spring 2006 CISC101 - Prof. McLeod 21 Spring 2006 CISC101 - Prof. McLeod Click on the little green arrow thing at the top, as shown on the next slide. 26.Note that Eclipse compiles your program when it saves it. Spring 2006 CISC101 - Prof. McLeod 23 Spring 2006 CISC101 - Prof. McLeod 24 4

5 27.Provided you have not made any compiler errors, you should see your output in the Console window at the bottom. 28.Make some deliberate errors in your code to see what happens. Eclipse pre-compiles your program as you write it, and will not run it until you have fixed all the errors it has detected. Development Environments You can choose BlueJ or Eclipse (or any other tool you like!). I will usually use Eclipse for class demonstrations. (I m not going to try the command prompt again ) Spring 2006 CISC101 - Prof. McLeod 25 Spring 2006 CISC101 - Prof. McLeod 26 Java Keywords abstract double int super assert else interface switch boolean enum long synchronized break extends native this byte for new throw case final package throws catch finally private transient char float protected try class goto public void const if return volatile continue implements short while default import static do instanceof strictfg Spring 2006 CISC101 - Prof. McLeod 27 Java Keywords, Cont. The goto keyword is reserved but does not do anything in java. On the next slide I have highlighted the keywords that we will be using in this course. Spring 2006 CISC101 - Prof. McLeod 28 Java Keywords for CISC101 abstract double int super assert else interface switch boolean enum long synchronized break extends native this byte for new throw case final package throws catch finally private transient char float protected try class goto public void const if return volatile continue implements short while default import static do instanceof strictfg Spring 2006 CISC101 - Prof. McLeod 29 Java Keywords for CISC101, by Category Primitive Types boolean byte char double float int long short Conditionals if else switch case Loops do for while continue break Structural class import new public return static final void Spring 2006 CISC101 - Prof. McLeod 30 5

6 Other Things in Java Programs Comments Variable names Literal values Punctuation like: ;., ( ) { } [ ] Operators like: + - / % > < == =! && We will also see lots of other object names along with their members attributes or methods. Expressions A line of code in java often contains expressions. They are combinations of any or all of: Variables Literal Values Operators Method Invocations A line of code in java is terminated by a ; Spring 2006 CISC101 - Prof. McLeod 31 Spring 2006 CISC101 - Prof. McLeod 32 Variables Java is a declarative language. This means that you have to declare a variable before you can use it. What is a variable anyways? A name for a piece of memory used to store something. The something can be a primitive type value or a pointer to an object (a memory reference). (Don t worry about pointers, yet!!) Spring 2006 CISC101 - Prof. McLeod 33 Variables, Cont. To create a variable, you must state what type it is going to be. For example, to create a variable called anum of type int, you would use the following line of code: int anum; You could assign a value to anum using something like: anum = 200; Spring 2006 CISC101 - Prof. McLeod 34 What is a literal value? We just saw one: 200 Back to Expressions Expressions Now, let s consider each of these elements again, in more detail: variables, literal values, operators. What is an operator? We just saw one of those too: = Other operators, for example, are: + - / * And, what is an expression? We just saw one of those too!: anum = 200; Spring 2006 CISC101 - Prof. McLeod 35 Spring 2006 CISC101 - Prof. McLeod 36 6

7 Java Primitive Types Primitive Types - Cont. Primitive Type variables are those that are not Objects in Java. Primitive Type Variables fall into the categories of integer types, real types, characters and booleans. Integer byte short Real float double Character char Boolean boolean int long Spring 2006 CISC101 - Prof. McLeod 37 Spring 2006 CISC101 - Prof. McLeod 38 An Integer Primitive Type Variable Declare using the int keyword. From to , inclusive (4 bytes). (A byte is 8 bits, where a bit is either 1 or 0.) For example: More Integer Primitive Types Other primitive types: byte, short and long: For byte, from -128 to 127, inclusive (1 byte). For short, from to 32767, inclusive (2 bytes). (For int, from to , inclusive (4 bytes). ) For long, from to , inclusive (8 bytes). int anum; Spring 2006 CISC101 - Prof. McLeod 39 Spring 2006 CISC101 - Prof. McLeod 40 Aside - Storage of Integers Computers like to store numbers in binary - a memory location is either on or off. An un-signed 8 digit binary number can range from to is 0 in base is 1x x x x2 7 = 255, base 10. Storage of Integers - Cont. So, how can a negative binary number be stored? Use the two s complement system of storage. Make the most significant bit a negative number: So, the lowest signed binary 8 digit number is now: , which is -1x2 7, or -128 base 10. Spring 2006 CISC101 - Prof. McLeod 41 Spring 2006 CISC101 - Prof. McLeod 42 7

8 Storage of Integers - Cont. Storage of Integers - Cont. binary base For example, the binary number is 1x x x2 4-1x2 7 = = -107 base 10 Now you can see how the primitive integer type, byte, ranges from -128 to 127. Spring 2006 CISC101 - Prof. McLeod 43 Spring 2006 CISC101 - Prof. McLeod 44 Storage of Integers - Cont. Suppose we wish to add 1 to the largest byte value: This would be equivalent to adding 1 to 127 in base 10 - the result would normally be 128. In base 2, using two s complement, the result of the addition is , which is -128 in base 10! So integer numbers wrap around, in the case of overflow - no warning is given! Storage of Integers - Cont. An int is stored in 4 bytes using two s complement. An int ranges from: to or to in base 10 Spring 2006 CISC101 - Prof. McLeod 45 Spring 2006 CISC101 - Prof. McLeod 46 A Double Primitive Type Variable Declare using the double keyword. For double, (8 bytes) roughly ±4.9 x to ±1.7 x to 15 significant digits. For example: The Other Real Primitive Type Also have float: For float, (4 bytes) roughly ±1.4 x to ±3.4 x to 7 significant digits. For double, (8 bytes) roughly ±4.9 x to ±1.7 x to 15 significant digits. double aval; Spring 2006 CISC101 - Prof. McLeod 47 Spring 2006 CISC101 - Prof. McLeod 48 8

9 Integer Literals A literal integer value is assumed to be of type int. If you want the literal to be a long, then you must add the letter L to the end of the literal value. Double Literals Java assumes a literal number like 2.5 or 3.45e-7 is a double literal. If you want a literal to be recognized as a float type, then you must add the letter F to the end of the number. Spring 2006 CISC101 - Prof. McLeod 49 Spring 2006 CISC101 - Prof. McLeod 50 char Primitive Type Declared as: char achar; Char literals look like: a B 1 (a space) char Primitive Type - Cont. A char primitive type can also refer to a Unicode character. For example: char achar = \u03c0 ; Where 03C0 is the hexadecimal (base 16) value for the Unicode character: π Since two bytes are used to designate the character value, it is possible to refer to 2 16 = 65,536 different characters. Spring 2006 CISC101 - Prof. McLeod 51 Spring 2006 CISC101 - Prof. McLeod 52 Aside - Unicode Characters The ASCII code system only goes to 255 since it only uses one byte. At the moment, just over 49,000 of the Unicode positions are in use. See A Boolean Primitive Type Variable Declare using the boolean keyword. Either true or false For example: boolean aflag; boolean literals are: true, false Spring 2006 CISC101 - Prof. McLeod 53 Spring 2006 CISC101 - Prof. McLeod 54 9

10 Aside - String s String s are not primitive data types, but are Objects. We will discuss the difference later A String can be declared in the same way as a primitive type using the keyword: String. For example: String response; Variable Declaration To declare a variable, use the Java keyword appropriate for the type of variable you are declaring followed by a variable name you have created, followed by a semicolon. Examples: int anum; double totalvolume; String userprompt; Spring 2006 CISC101 - Prof. McLeod 55 Spring 2006 CISC101 - Prof. McLeod 56 Legal Variable Names Legal Variable Names - Cont. Java names may contain any number of letters, numbers and underscore ( _ ) characters, but they must begin with a letter. Standard Java Naming Convention: Names beginning with lowercase letters are variables or methods. Names beginning with uppercase letters are class names. Successive words within a name are capitalized. Names in all capital letters are constants. (We ll get to constants shortly). Legal names: mydata x1 AnotherName TWO_PI Illegal names: _toupper 1Day Variable or method names Class names Constant Spring 2006 CISC101 - Prof. McLeod 57 Spring 2006 CISC101 - Prof. McLeod 58 int s, for example: Literal Values double numbers, for example: E E45 boolean, for example: true String literals: Hello! spaces Variable Declaration - Cont. int and double variables initially are given a value of zero unless they are initialized to a value. Java may prevent you from using variables that are not initialized. So, it is often necessary to initialize your variables before use, for example: int numdaysinyear = 365; double avgnumdaysinyear = ; String greetingline = Hello there! ; Spring 2006 CISC101 - Prof. McLeod 59 Spring 2006 CISC101 - Prof. McLeod 60 10

11 Variable Declaration - Cont. All these statements could be carried out in two lines, for example: int numdaysinweek = 7; Is the same as: int numdaysinweek; numdaysinweek = 7; Constants The Java keyword, final can be used to make sure a variable value is no longer variable. It becomes a constant, because Java will not allow your program to change its value once it has been declared: final int NUM_DAYS_IN_YEAR = 365; final double MM_PER_INCH = 25.4; Spring 2006 CISC101 - Prof. McLeod 61 Spring 2006 CISC101 - Prof. McLeod 62 Arithmetic Operators The standard arithmetic operators in Java are: Addition (+) Subtraction (-) Multiplication (*) Division (/) Modulo (or remainder ) (%) All of these operations apply to all numeric data types. All require values on both sides of the operator. Aside - Strings and the + Operator Not only can + operate on numeric values, but it can also handle String s on either or both sides. If one side is not a String, it will be changed to one, and then it will be concatenated to the String on the other side: 4 + you evaluates to 4you apples + oranges + 99 evaluates to applesoranges little piggies evaluates to 10little piggies Spring 2006 CISC101 - Prof. McLeod 63 Spring 2006 CISC101 - Prof. McLeod 64 Logical Operators Return either true or false. All these require values on both sides of the operator. ==!= > < >= <= && logical And logical Or equals to not equals to greater than less than greater than or equal to less than or equal to Spring 2006 CISC101 - Prof. McLeod 65 Logical Operators - Cont. Truth tables for the And and Or operators: boolean result = testa && testb; && testa testb true false testa true true false testb true false false false false true true true false true false boolean result = testa testb; Spring 2006 CISC101 - Prof. McLeod 66 11

12 = set equal to Assignment Operator This is all we need to be able to build Java expressions. There are other assignment operators (+=, -=, *=, /=), but we ll look at these later. We will also consider unary operators later too. Expressions Expressions are combinations of variables, literal values, and operators. For example: int anum = * 7; // anum is 25 int anum = (4 + 3) * 7; // anum is 49 (4 > 7) (10 > -1) // yields true (5.5 >= 5.0) && (4.0!= 1.0)// yields true double circ = 3.14 * 2.0 * r; ( // precedes a comment in Java) Spring 2006 CISC101 - Prof. McLeod 67 Spring 2006 CISC101 - Prof. McLeod 68 Precedence Rules Operator precedence rules determine which operations take place in what order: First *, /, % Then +, - Then <, >, <=, >= Then ==,!= Then &&, Last = Use ( ) to control order of operations, as the expression inside ( ) will be evaluated before stuff outside of ( ). Spring 2006 CISC101 - Prof. McLeod 69 12

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