Oop Reviewer

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JAVA

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Is developed for embedded software

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OOP(Object Oriented Programming)

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Favored for larger, more complex projects or when modeling real-world entities is beneficial.

Promotes modularity by dividing software into smaller, self-contained objects or classes.

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Procedural-Oriented Programming

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Are large programs divided into smaller programs known as functions.

Data and function are often separate with functions operating data.

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Mnemonics

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Is used to create Instruction and data

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The Three Types of Error

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1.) Syntax Error

2.) Logical Error

3.) Run-time Error

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Object

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Consist of attributes and methods mechanism that combine data and operations in single unit.

Can store Data.

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Property

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attribute or state characteristic

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Method

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Do something, functions, behavior.

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Interpreter

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Checking the output line by line.

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Compiler

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Checks the program as a whole

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Class

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Is a collection of object.

a blueprint.

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List of OOP Design Principles

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- Encapsulation

- Abstraction

- Inheritance

- Polymorphism

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Encapsulation

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Binds data together, no direct access is granted to the info in case it's hidden.

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Abstraction

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Allowing users to only see relevant and useful information

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Inheritance

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Child classes inherit from main class or from existing class

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Polymorphism

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Same class but can have different method or function

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List of OOP Relationships

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- Association

- Aggregation

- Composition

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Aggregation

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independent, can exist on its own.

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Composition

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Cannot exist on its own, is dependent.

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Association

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relationship between two separate classes.

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The Founder of JAVA

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James Gosling

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JAVA Development Kit (JDK)

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Latest release of JAVA SE Platform

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Characteristic of JAVA

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1. Platform Independent.

2. Simple.

3. Object-oriented.

4. Robust.

5. Distributed.

6. Dynamic.

7. Secure.

8. Performance.

9. Multi-threaded.

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Just-in-time Compilation

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Design to improve the execution performance of programs and reduce startup times by dynamically translating and compiling code at runtime, right before it is executed.

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Multi-threading

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Ability of a program or an operating system to enable more than one user at a time without requiring multiple copies of the program running on the computer.

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Java Virtual Machine

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Enables a computer to run Java programs as well as programs written in other languages that are also compiled to Java byte code.

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Interface

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Collection of Empty methods

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Package

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way of grouping related classes.

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java.lang

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Default and base package in java

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import java.io*;

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used to process the input and produce the output.

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import java.util.*;

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built-in package that contains various utility classes and interfaces.

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import java.util.Arrays;

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The package java.util contains the class named Arrays. Write the statement that will allow you to access all methods under the class Arrays.

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3 Data Types in Java

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- Primitive Type

- Class Type

- Identifier Type

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Primitive Type

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- its values are simple, indecomposable values, such as a single letter or a single number, lowercase letter.

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Class Type

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Is a type for objects with both data and methods

Uppercase Letters.

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Identifiers

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Includes the name of a variable, name of a class, a method or an object.

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Correct way of Declaring BufferedReader Class

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- BufferedReader objectName = new BufferedReader(new inputStreamReader(System.in));

- InputStreamReader objectName = new inputStreamReader (System.in);

BufferedReader objectName1 = newBufferedReader(objectName);

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Way of declaring the main method in Java

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- public static void main(String[] args)

- public static void main(String[] s)

- public static void main(String args[])

- public static void main(String s[])

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Using the BufferedReader object named myReader, write the syntax for getting an integer input to be stored at variable myInput

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int myInput= myReader.readline();