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java.awt.Component.size() getfield int java.awt.Dimension.height putfield int height aload_0 # var 001_0 1dc1 "GRIDWIDTH" =========== invokevirtual java.lang.String java.applet.Applet.getParameter (java.lang.String) astore_1 # var 001_1 Bytecode - A special machine language that can be understood by the Java Virtual Machine (JVM) fppt.com b. Flowchart - is a design tool to graphically represent the logic in a solution fppt.com Computer Program Computer is a set of instructions for a computer to follow. Programming is providing a computer a program. Programmer a person who develops the set of instructions. - Os Sapplied Services - Java Application JVM Java Virtual Machine is an imaginary machine that is implemented by emulating software on a real machine Operating System provides the hardware platform specification to which you compile all Java technology code fppt.com Flowchart BASIC SYMBOLS 211 Connector Connects one part of a flowchart to another Arrows Connect symbols and signify the flow or sequence of operations fppt.com Phases of a Java Program Edit Compile Execute ● ● Editor Compiler • Java Virtual Machine / ● Interpreter Program is created in an editor and stored in a disk file with the extension .java Java compiler creates bytecodes and stores them on disk with the file extension .class The .class file is then interpreted by the Java interpreter that converts the bytecodes into the machine language of the particular computer you are using. fppt.com Program Development Life Cycle 1. Problem Definition 2. Problem Analysis 3. Algorithm design and representation (pseudocode or flowchart) 4. Coding and debugging fppt.com Program Development Life Cycle 1. Problem Definition - The problem must be well and clearly defined first. - Example: Let us now define our example problem: "Create a program that will determine the sum of the two numbers entered by the user" fppt.com Overview of Computer Programming Languages FLOW-MATIC 1957 FORTRANI 58 FORTRAN II 59 60 61 62 FORTRAN IV 63 64 65 History Timeline 66 67 68 69 70 71 72 73 74 75 76 77 78 FORTRAN 77 79 80 81 82 83 84 85 86 87 88 89 90 FORTRAN 90 91 92 93 94 95 ALGOL 58 ALGOL 60 ALGOL W SIMULA I Pascal MODULA-2 Oberon MODULA-3 • APL SIMULA 67 ALGOL 68 Ada 83 Ada 95 COBOL BASIC Smalltalk 80 Eiffel PL/I QuickBASIC Visual BASIC CPL BCPL B C C++ Java LISP Scheme SNOBOL ANSI C ICON COMMON LISP Flowchart - graphic representation of an algorithm. BASIC SYMBOLS Terminal Symbol Used to signify the beginning or end of the program Input/Output Represents an instruction that gets input from or sends output to an I/O device. fppt.com Begin Is the crossing sign red? Example Cross the Street End Wait fppt.com Overview of Computer Programming Languages...cont. Categories of Programming Languages 1. High-level PL a programming language that is more user- friendly and allow the programmer to work in a more English-like environment - closer to the human languages - Examples: Java, C, C++, Basic, Fortran, etc. fppt.com Pseudocode • textual version of an algorithm. It resembles an actual program and it presented in a format close to how a spoken language and may may contain borrowed constructs of a programming language. fppt.com Program Development Life Cycle 2. Problem Analysis It involved breaking up the problem into smaller and simpler subproblems. Input to the program: Two numbers Output of the program: The sum of the two inputted numbers fppt.com End of Presentation... Any Question??? Thank you... ☺☺☺ fppt.com Overview of Computer Programming Languages...cont 1991 - Sun Microsystems funded an internal corporate research project code-named Green, which resulted in the development of a C++- based language that its creator, James Gosling, called Oak. Sun formally announced Java at a major conference in May 1995 *Note: Oracle now is is the owner of Java Programming Language, not the Sun Microsystem, Inc. fppt.com Overview of Computer Programming Languages...cont Programming Language ✓a system of signs used by the computer and its user to communicate with each other ✓ a system of signs used by a person to communicate a task/algorithm to a computer, causing the task to be performed ✓ like human languages, each language has its own syntax and grammar fppt.com Overview of Computer Programming Languages...cont Communicating parties Mode of communication rules Natural Language Programming Lang. Person to person Person to computer Spoken/written Codes/coding grammar syntax fppt.com Program Development Life Cycle 3. Algorithm/Pseudocode/Flowchart It expressed our solution in a step-by-step manner a. Algorithm - is a clear and unambiguous specification of the steps needed to solve a problem - It may expressed in either Human Language (English, Tagalog) fppt.com Flowchart BASIC SYMBOLS Process Symbol Denotes an operation/computation that must be performed Decision Symbol Used for branching statements. A condition is placed inside the symbol. fppt.com Begin End Algorithm Get two numbers from the user Add the 2 numbers Get and display the sum of the numbers fppt.com