Java SE 8 OCA 1Z0-808: Programming & Practice Exams

Explore if statements and conditional logic to direct program flow with boolean conditions, if-else, and simple examples like a calculator.

Learn how to implement decision making in Java using if statements, if-else chains, nested conditions, and switch cases with break and default.

Explore loops and iteration by comparing while and do-while structures, showing how i from 0 to 4 prints hello world five times and handles conditions.

Explore loops in Java, including for, while, and do while loop, and how initialization, boolean expressions, and updates control repeated execution; break and continue manage loop flow.

Explore how arrays store multiple integers in C, declaring a one-dimensional array, initializing values, and accessing elements via indices from base to last.

Explore two-dimensional and three-dimensional arrays, compare them with one-dimensional arrays, and learn how to organize students by class and school across multiple dimensions.

Learn how to declare and use arrays in Java, iterate with for loops, sum elements, and find minimum and maximum values, then print all elements.

Explore two-dimensional arrays with a 3x4 rating table of reviewers and movies, using zero-based row and column indices. Compute a reviewer's average by summing a row and dividing by four.

Explain functions as reusable code blocks that take input and return output, enabling modular software design. Compare built-in and user-defined functions across functional programming concepts.

Learn to perform file input and output by reading from and writing to files using modes like read, write, append, and read-write, with C++, Java, and Python examples.

Master file input/output in Java using file input stream and file output stream, with import java.io.* and handling IOException and file not found exceptions.

Discover object oriented programming as a paradigm centered on objects with attributes and methods, teaching how objects interact, analyze requirements, and design and implement with classes.

Explain how object oriented programming centers on objects and classes, where classes define data and methods and objects are instances with identity, state, and behavior, including inheritance for code reuse.

Explore objects and classes in Java, including states and behaviors, polymorphism, inheritance, encapsulation, abstraction, constructors, instantiation, and how objects interact through methods.

Explore how import statements and packages organize Java classes, then define a student class with fields, constructors, and methods, and run a test class to print details.

Explore methods in object-oriented programming and the five terms—class variables, instance variables, member variables, class methods, and instance methods.

Learn how to define and invoke methods in Java, with and without parameters, return values or void, including examples of max methods and reusable code.

Encapsulation binds data and the functions that manipulate it, enforces access restrictions with private and public modifiers, and enables data hiding to protect internals.

The lecture explains method passing, where an object selects the code to run in a method call via dynamic dispatch. Multiple and directional message passing occur between objects.

Explore inheritance in object oriented programming, from base or super classes to derived and sub classes, and learn the five types: single, multiple, multilevel, hierarchical, and hybrid.

Explore polymorphism as subtyping that allows the same method name to behave differently across circle and square shapes, dog and cat sounds, and inherited classes, via a common external interface.

Explore generalization and specialization: build generalized superclasses from common traits and derive specialized subclasses, learn 'is a kind of' relationships, and how teams decide when to generalize or specialize.

Explore how associations define relationships between objects and how links instantiate those associations, including binary, ternary, and one-to-one to many-to-many cardinalities in dbms.

Learn a three-step process to master SQL, the language for retrieving and managing data in relational databases across popular RDBMS like MySQL, MariaDB, SQL Server, Oracle, and PostgreSQL.

Understand why SQL is the standard language for relational database systems, enabling data storage, retrieval, and manipulation for popular web and mobile apps.

Install and configure XAMPP to run Apache, MySQL (or MariaDB) database server, with SQLYOG Community Edition as the database client for local development.

Start and manage database services from the control panel, including Apache web server and MySQL (MariaDB), verify port 3306, monitor process IDs, and review status logs.

Connect to a MySQL server on localhost as root, test the connection, and create your first database with a query, then explore tables, views, stored procedures, functions, triggers, and events.

Learn how to drop and recreate a database using SQL queries, including showing databases, creating new ones, and refreshing the browser, with emphasis on backing up to avoid data loss.

Create the first database table students with id as integer primary key not null, name as varchar(30) not null, and optional grade and degree as decimal.

Learn how to drop a table with the drop table statement, verify the table is removed by refreshing the objects, and then use insert into to add new rows.

Learn how to write insert statements to add data to a table, specify column names or omit them for all columns, and verify results by refreshing the table.

Create a new table from an existing table using a select statement to copy all data, producing a new students table and its result set.

Learn the basic select statement to retrieve data from a table, using select * or selecting column names from a table such as students, showing names and AIDS.

Master the where clause to filter records in select, insert, update, and delete queries, handling integers and strings with quotes or brackets.

Master SQL operators for filtering data, including greater than, less than, and equal, and combine conditions with and or to tailor select queries like name and age from students.

Modify existing records in a table using the update query and update statement by setting column values and applying where conditions; verify changes with a select.

Execute delete statements to remove records from a table, such as deleting from students where name equals Chris. Omitting the where clause deletes all records, and refreshing confirms the update.

Learn how the like operator uses wildcard characters, % and _, to filter values in a where clause, enabling pattern matching such as names containing MAL or starting with Greece.

Learn how to limit query results across MySQL, MSSQL, and Oracle using limit, top, and rownum, with the same logic to fetch a specific number of records.

Learn to use the order by clause to sort query results in ascending or descending order, including multi-column sorting, while ensuring the sort columns appear in the select list.

Explore how the group by clause works with select to group rows by name, then apply aggregates like sum or count before the order by clause.

Learn how to use the distinct keyword with select to return only unique records and remove duplicates, with basic syntax and examples from a students table.

Learn to delete data with delete and truncate, drop and recreate tables, and verify results with select queries to understand basic SQL data manipulation.