a balanced introduction to computer science 3e pdf

... interpreter is a program that simulates a computer that understands a high-level language Rather than translating the source program into a machine language equivalent, the interpreter analyzes and executes ... use an accumulator variable and a loop structure The general pattern looks like this Initialize the accumulator variable Loop until final result is reached update the value of accumulator variable ... primarily as number crunchers, and that is still animportant application As you have seen, problems that involve mathematical formulas are easy to translateinto Python programs This chapter takes

Ngày tải lên: 25/03/2017, 17:07

... UML Diagrams • In UML diagrams – private variables and methods are indicated using a leading minus sign as a prefix – public variables and methods are indicates using a leading plus sign as a prefix ... behavior • Association (or acquaintance) – classes and objects are linked in a manner that allows the object to remain visible to clients – classes can be linked when a client passes an object as a message ... as the class name • May have parameters • Default constructors have no parameters • Constructors can be overloaded (more than one definition in the same class) Trang 13• Each constructor differs

Ngày tải lên: 11/01/2020, 18:40

... 18   Trang 19   Drawing in Java // code to read and display GIF image from file import java.awt.*; Import CSLib.*; … DrawingBox g = new DrawingBox(); … Toolkit tools = Toolkit.getDefaultToolkit(): ... Trang 1   Chapter 6 Iteration Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by S.N Kamin, D Mickunas, E Reingold Trang 2   Chapter Preview In this chapter ... variable cent = cent + 1.0; } Trang 5   Trang 6   for Statement • Used to implement pre-test loops that are controlled by incrementing a variable each time the loop is executed • Loop variable

Ngày tải lên: 11/01/2020, 18:43

... Packages java.applet Classes for implementing applets java.awt Classes for graphics, windows, and GUI’s java.awt.event Classes supporting AWT event handling java.awt.image Classes for image handling ... classes stored in each directory form a package • The package names are formed by concatenating the directory names starting from a particular root directory Trang 4   Some Predefined Java Packages ... java.awt.peer Interface definitions s for platform independent graphical user interfaces (GUI’s) java.io Classes for input and output java.lang Basic language classes like Math (always available

Ngày tải lên: 11/01/2020, 18:45

... from A[lo} A[hi] // move elements so A[lo] A[m-1] are all < A[m] // move elements so A[m+1] A[hi] are all > A[m] swap(A, lo, medianLocationA, lo+1, hi, Trang 19Partition Helperstatic ... Trang 16Quicksort Overview• Choose the middle element among A[lo] A[hi] • Move other elements so that – A[lo] A[m – 1] are less than A[m] – A[m + 1] A[hi] are greater than A[m] • Return m to ... Trang 1Chapter 14Recursion Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by Trang 2Chapter PreviewIn this chapter we will: • introduce recursion as a

Ngày tải lên: 11/01/2020, 18:46

... Trang 1Chapter 11 Java AWT Part |: Mouse Events (Optional) Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by S.N Kamin, D Mickunas, E Reingold Trang ... Interface show how mouse events can be used to build highly interactive programs Trang 3Abstract Windowing Toolkit (AWT) ¢ Part of the Java distribution, but not part of the Java language itself ... AWT Is library of classes and methods used by Java programmers that supported are by the basic Java runtime libraries ¢ Even though this chapter is labeled optional, itis not possible to be a

Ngày tải lên: 11/01/2020, 18:47

... Instance variable declarations can contain initializers just like local variables • Unlike local variables, instance variables will be initialized to default values if no initializers are ... classname { // Author, data, explanation declarations of instance variables public void methodName1 (parameter) { declarations of local variables executable statements with comments Trang ... integers and doubles are initialized to 0 – characters are initialized to the null character (ASCII code 0) – booleans are initialized to false – object-type variables are initialized to the reference

Ngày tải lên: 11/01/2020, 19:00

... Buttons, and Labels) show how Java programs can be made to react to user actions on Java graphical components show how Java applications can be run from inside web browsers Trang 3Frames e A ... shows that the class TwoButtons contains a class Frame which contains a class Buttons A good UML diagram only shows the classes and associations that are important to understanding the architecture ... «governs layout Trang 27Panel and Canvas Classes ¢ The Panel class Is container subclass that Is used to reserve a rectangular portion of a Frame to place other components ¢ The Canvas class

Ngày tải lên: 11/01/2020, 19:02

... program – class name must match root of file name – each class must be stored in a file of its own Trang 8– also known as methods– define operations that may be applied to a Java data object (class ... atomic statements – single Java expressions terminated by a ; • variable assignment statement – executable statement which copies a particular value to a data location Trang 10– Must begin with a letter ... DrawingBox for graphical output Trang 3   Trang 4   Trang 5   Running Java Programs • Enter the program source code in a data file called Hitwall.java using an editor • Compile the source program by typing

Ngày tải lên: 11/01/2020, 19:06

... argument to a method, what is passed is a pointer to the array, not a new array (arrays are passed by reference) • This means that if the method makes changes to the array, these changes are still ... } Trang 10   Trang 11   Aliases • It is possible to have two different variables refer to the same array • When this happens these variables are called aliases • Creating aliases is not a good ... out.println(counts[i]); } Trang 14   Extra Capacity Array • Arrays cannot grow after they have been allocated • You can allocate more space than you believe your application will need • If you guess too low, you

Ngày tải lên: 11/01/2020, 19:27

... which may be followed to solve a problem Trang 4Final Maze Solving Program Trang 5Object-Oriented Programming A modern programming paradigm that allows the programmer to model a problem in a real- ... Trang 1Chapter 1 What is Programming? Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by S.N Kamin, D Mickunas, E Reingold Trang 2Chapter Preview ... 8Object-Oriented Programming and Java ¢ The use of OOP in Java Is pervasive — easy to create multiple objects of the same type — easy to create similar objects without having to rewrite the overlapping code

Ngày tải lên: 11/01/2020, 19:29

... Trang 1   Chapter 3 Fundamental Data Types of Java Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) byS.N Kamin, D Mickunas, E Reingold Trang 2   Chapter ... It is legal to assign a n int to an char variable char c = 97; // assigns ‘a’ to c • It is possible to perform arithmetic on char variables char ch = ‘a’; ch = ch + 1; // assigns ‘b’ to ch ... x) • To round-up instead of truncating add 0.5 i = (int) (10.3 * x + 0.5) Trang 25   Characters as Integers • It is legal to assign a char to an int variable int i = ‘a’; // assigns 97 to i •

Ngày tải lên: 11/01/2020, 20:03

... Trang 1   Chapter 9 Nested Loops and Two-Dimensional Arrays Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by S.N Kamin, D Mickunas, E Reingold Trang ... compute total for year y yearTotals[y] = 0.0; for (s =0; s < COLS; s++) yearTotals[y] = yearTotals[y] + energyTotal[y][s]; } Trang 11   Populating energyTable int y, s; // reads 30 numbers ... double[COLS]; Trang 15   Computer Graphics • Computer graphics is the study of methods of representing and manipulating images • A two-dimensional array can be used to represent the image to be displayed

Ngày tải lên: 11/01/2020, 20:21

... reading – allows line-oriented reading Trang 8Wrapper Classes• Class W is said to wrap class Y if: 1 Y is a concrete (not abstract) class 2 W’s constructor takes Y as an argument and stores a ... a single character – an array of characters – a string – the end of line • PrintWriter is a wrapper class provided to convert several data type values to printable forms Trang 14Writing to a ... a local copy of Y 3 W reimplements all of Y’s methods • A wrapper can wrap a class and be the subclass of another class at the same time Trang 9Buffered Input• We can make a file available for

Ngày tải lên: 11/01/2020, 20:25

... notation f.C( … ) • It has no receiver and cannot refer to instance variables • It can refer to and manipulate class variables Trang 6Classes with No Instance Variables or Methods • Some classes ... Trang 1Chapter 10Classes and Methods IV: Static Methods and Variables Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by S.N Kamin, D Mickunas, E ... methods operate only on built-in data types Trang 7Classes without Instance Methods Class ClassnameClient { // Author, date, expalnation public static void main (String[ ] args { Classname variable

Ngày tải lên: 11/01/2020, 20:29

... greater than <= less than or equal to >= greater than or equal to = == equal to != not equal to Trang 6   if Statement with Optional else • An if statement may have an optional else clause ... Logical “not” (negation) (MINIMUM_WAGE != wages) Trang 16   Boolean Operator Truth Table Trang 18   Complicated Boolean Expressions boolean isLeapYear = ((year % 4) == 0) && ((year % ... is smaller than the longer string • How do upper- and lower-case characters compare? – If a case-sensitive comparison is used lower-case is always less than upper case • How do special characters

Ngày tải lên: 11/01/2020, 20:31

... UML Diagrams • In UML diagrams – private variables and methods are indicated using a leading minus sign as a prefix – public variables and methods are indicates using a leading plus sign as a prefix ... behavior • Association (or acquaintance) – classes and objects are linked in a manner that allows the object to remain visible to clients – classes can be linked when a client passes an object as a message ... as the class name • May have parameters • Default constructors have no parameters • Constructors can be overloaded (more than one definition in the same class) Trang 13• Each constructor differs

Ngày tải lên: 15/05/2020, 22:27

... Trang 1   Chapter 9 Nested Loops and Two-Dimensional Arrays Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by S.N Kamin, D Mickunas, E Reingold Trang ... compute total for year y yearTotals[y] = 0.0; for (s =0; s < COLS; s++) yearTotals[y] = yearTotals[y] + energyTotal[y][s]; } Trang 11   Populating energyTable int y, s; // reads 30 numbers ... double[COLS]; Trang 15   Computer Graphics • Computer graphics is the study of methods of representing and manipulating images • A two-dimensional array can be used to represent the image to be displayed

Ngày tải lên: 15/05/2020, 22:29

... Packages java.applet Classes for implementing applets java.awt Classes for graphics, windows, and GUI’s java.awt.event Classes supporting AWT event handling java.awt.image Classes for image handling ... classes stored in each directory form a package • The package names are formed by concatenating the directory names starting from a particular root directory Trang 4   Some Predefined Java Packages ... java.awt.peer Interface definitions s for platform independent graphical user interfaces (GUI’s) java.io Classes for input and output java.lang Basic language classes like Math (always available

Ngày tải lên: 15/05/2020, 22:33

... notation f.C( … ) • It has no receiver and cannot refer to instance variables • It can refer to and manipulate class variables Trang 6Classes with No Instance Variables or Methods • Some classes ... Trang 1Chapter 10Classes and Methods IV: Static Methods and Variables Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by S.N Kamin, D Mickunas, E ... methods operate only on built-in data types Trang 7Classes without Instance Methods Class ClassnameClient { // Author, date, expalnation public static void main (String[ ] args { Classname variable

Ngày tải lên: 15/05/2020, 22:34