Dcit23

• Program Development Life Cycle

  1. Planning

  2. Analysis

  3. Design

  4. Development

  5. Testing

  6. Deployment

  7. Maintenance
• Program Development Life Cycle


  A process that software developers use to create software programs. It has different stages from the initial idea to final release and maintenance. The objective is to create software that works well, meets objectives, and is reliable
• Phases of Program Development Life Cycle

  • Conceptualization
  • Design
  • Implementation
  • Testing
  • Deployment
  • Maintenance
• Conceptualization Phase


  Gather and analyze software requirements, define project scope, timeline, and budget, develop a project plan
• Design Phase


  Create software design based on requirements, design architecture, create data models, define algorithms, create a prototype
• Implementation Phase


  Write code for the software, perform unit testing
• Testing Phase


  Test software as a whole, identify and fix bugs, perform functional testing, performance testing, security testing
• Deployment Phase


  Release software to end-users, install software, configure for use, provide documentation and training, provide maintenance and support
• Maintenance Phase


  Continue to maintain and support software, fix bugs, update software, provide technical support
• Java


  A programming language used to develop software applications, can run on various operating systems without modifications, code is compiled into bytecode for execution on any machine with a Java Virtual Machine (JVM)
• Java was introduced by Sun Microsystems


  1995
• Java


  • Write once, run anywhere
  • Java Virtual Machines
• Uses of Java in different Aspects of Technology


  • Web Applications
  • Mobile Applications
• Web frameworks built using Java

  • Spring
  • Struts
  • Hibernate
• Java in Mobile Applications

  • Language of choice for developing Android applications
  • Android Studio, the official IDE for Android app development, is built on Java
• Java in Enterprise Applications

  • Widely used for developing large-scale enterprise applications
  • Ideal for finance, healthcare, and other industries
• Java in Desktop Applications

  • Can be used to develop desktop applications
  • Provides a powerful UI toolkit for creating rich and interactive applications
• Java in Gaming


  • Used for developing games
  • Provides APIs for graphics, audio, and input
• Java in Internet of Things (IoT)


  • Used in the development of IoT applications
  • Ability to run on low-power devices and support for a wide range of sensors and actuators
• Java in Machine Learning and Artificial Intelligence

  • Used for developing machine learning and AI applications
  • Support for libraries like Weka and Mahout, ability to run on large-scale distributed systems
• How Java Works


  1. Compilation

  2. Loading

  3. Verification

  4. Execution

  5. Garbage Collection

  6. Termination
• Programmers create a program by translating Java code into bytecode, loading it into the JVM, verifying it, executing it, performing garbage collection, and terminating it
• Java's Programming Paradigms
• Programming Paradigms in Java

  • Procedural
  • Object-Oriented
  • Inheritance
  • Encapsulation
  • Polymorphism
  • Abstraction
• Example of a Java Program
• Access Modifiers in Java
• Types of Access Modifiers

  • Public
  • Private
  • Protected
  • Default
• Classes in Java can be built-in or custom, representing standard or specific concepts respectively
• Class Header specifies the class name in Java programs
• Class Header


  • Specifies the class header with the name Mavenproject1 as the class name
  • Every java program must have at least one class definition
  • Class is used as a container for the statements that we will use for our program
  • You cannot have more than one public class in a single .java file
  • The name of the public class should be the same as the file name of the .java file
• Method Header


  • This method is directly under the class Mavenproject1
• Static vs Non-Static


  • Static Method is associated directly to the class itself, can be called directly without creating an object of a class
  • Non-Static Method (Instance Method) need to create an object of the class in order to access it
• Data Types


  • Java has data types, when used in a method, signals that there will be data to be returned once the method is done executing, in the main method, void data type is used
• Method Name


  • The main method in java is always named main as this is where the program always starts
• Array


  • A string class that accepts zero or multiple arguments
• Open and Close Brace


  • Indicates the content of the class or method
• Method


  • Also called as Method Definition, a block of code that will perform a specific task when executed
• Escape Sequence


  • Character combinations consisting of a backslash (\) followed by a letter or digits, used to represent special characters like newline, single quotation mark, etc.
• Import is a keyword used to include classes or packages from other files or libraries into a program
• When you import a class or package, you can use its methods, fields, and other members in your code without having to fully qualify the class or package name each time you reference it