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  1. 1. Computer: • A programmable device that can store, retrieve, and process data. Bus Storage Devices e.g., Disk, CD, and Tape Memory CPU Communication Devices Input Devices Output Devices e.g., Modem, and NIC e.g., Keyboard, Mouse e.g., Monitor, Printer
  2. 2. The operating system is a program that manages and controls a computer’s activities. The popular operating systems for general-purpose computers are Microsoft Windows, Mac OS, and Linux. User Application Programs Operating System Hardware
  3. 3. Computer program: • A sequence of instructions to be performed by a computer. Computer programming: •Problem-Solving Phase •Implementation Phase •Maintenance Phase Algorithm: A step-by-step procedure for solving a problem in a finite amount of time. Programming language: • A set of rules, symbols, and special words used to construct a computer program Steps in learning language: Alphabets Digits Special Symbols Characters Variables Keywords Instructions Program
  5. 5. MACHINE LANGUAGE The language, made up of binary-coded instructions, that is used directly by the computer. A low-level programming language in which a mnemonic (Assisting ASSEMBLY LANGUAGE in memory) is used to represent each of the machine language instructions for a particular computer. Assembly Language Machine Language ADD 100101 SUB 010011 Assembler: A program that translates an assembly language program into machine code. Compiler: A program that translates a high-level language into machine code. Machine Code Assembly Source Assembler ADDF3 R1, R2,R3 1100101010011010
  6. 6. EVENT HANDLING: Event handling comes with user defined GUI. For example when you click on a button, it is supposed to be an event. and the way the java handles these events is termed to be EVENT HANDLING. For this event handling you have listeners..who listen to your specific actions..i.e...clicks, press, release etc.. for more reference see this wt/event/package-summary.html