Java Certification

Java Certification Path

OCA Java SE 7 Programmer I

Java Basics

Define the scope of variables
Define the structure of a Java class
Create executable Java applications with a main method
Import other Java packages to make them accessible in your code

Working With Java Data Types

Declare and initialize variables
Differentiate between object reference variables and primitive variables
Read or write to object fields
Explain an Object’s Lifecycle (creation, “dereference” and garbage collection)
Call methods on objects
Manipulate data using the StringBuilder class and its methods
Creating and manipulating Strings

Using Operators and Decision Constructs

Use Java operators
Use parenthesis to override operator precedence
Test equality between Strings and other objects using == and equals ()
Create if and if/else constructs
Use a switch statement

Creating and Using Arrays

Declare, instantiate, initialize and use a one-dimensional array
Declare, instantiate, initialize and use multi-dimensional array
Declare and use an ArrayList

Using Loop Constructs

Create and use while loops
Create and use for loops including the enhanced for loop
Create and use do/while loops
Compare loop constructs
Use break and continue

Working with Methods and Encapsulation

Create methods with arguments and return values
Apply the static keyword  to methods and fields
Create an overloaded method
Differentiate between default and user defined constructors
Create and overload constructors
Apply access modifiers
Apply encapsulation principles to a class
Determine the effect upon object references and primitive values when they are passed  into methods that change the values

Working with Inheritance

Implement inheritance
Develop code that demonstrates the use of polymorphism
Differentiate between the type of a reference and the type of an object

Determine when casting is necessary

Use super and this to access objects and constructors

Use abstract classes and interfaces

Handling Exceptions

Differentiate among checked exceptions, RuntimeExceptions and Errors

Create a try-catch block and determine how exceptions alter normal program flow

Describe what Exceptions are used for in Java
Invoke a method that throws an exception
Recognize common exception classes and categories


Java Class Design

Use access modifiers: private, protected, and public

Override methods
Overload constructors and methods
Use the instanceof operator and casting
Use virtual method invocation
Override the hashCode, equals, and toString methods from the Object class to improve the functionality of your class.
Use package and import statements

Advanced Class Design

Identify when and how to apply abstract classes
Construct abstract Java classes and subclasses
Use the static and final keywords
Create top-level and nested classes
Use enumerated types

Object-Oriented Design Principles

Write code that declares, implements and/or extends interfaces
Choose between interface inheritance and class inheritance
Apply cohesion, low-coupling, IS-A, and HAS-A principles
Apply object composition principles (including has-a relationships)
Design a class using a Singleton design pattern
Write code to implement the Data Access Object (DAO) pattern
Design and create objects using a factory pattern

Generics and Collections

Create a generic class
Use the diamond for type inference
Analyze the interoperability of collections that use raw types and generic types
Use wrapper classes, autoboxing and unboxing
Create and use List, Set and Deque implementations
Create and use Map implementations
Use java.util.Comparator and java.lang.Comparable
Sort and search arrays and lists

String Processing

Search, parse and build strings (including Scanner, StringTokenizer, StringBuilder, String and Formatter)
Search, parse, and replace strings by using regular expressions, using expression patterns for matching limited to: . (dot), * (star), + (plus), ?, \d, \D, \s, \S,  \w, \W, \b. \B, [], ().
Format strings using the formatting parameters: %b, %c, %d, %f, and %s in format strings.

Exceptions and Assertions

Use throw and throws statements
Develop code that handles multiple Exception types in a single catch block
Develop code that uses try-with-resources statements (including using classes that implement the AutoCloseable interface)
Create custom exceptions
Test invariants by using assertions

Java I/O Fundamentals

Read and write data from the console
Use streams to read from and write to files by using classes in the package including BufferedReader, BufferedWriter, File, FileReader, FileWriter, DataInputStream, DataOutputStream, ObjectOutputStream, ObjectInputStream, and PrintWriter

Java File I/O (NIO.2)

Operate on file and directory paths with the Path class
Check, delete, copy, or move a file or directory with the Files class
Read and change file and directory attributes, focusing on the BasicFileAttributes, DosFileAttributes, and PosixFileAttributes interfaces
Recursively access a directory tree using the DirectoryStream and FileVisitor interfaces
Find a file with the PathMatcher interface
Watch a directory for changes with the WatchService interface

Building Database Applications with JDBC

Describe the interfaces that make up the core of the JDBC API (including the Driver, Connection, Statement, and ResultSet interfaces and their relationship to provider implementations)
Identify the components required to connect to a database using the DriverManager class (including the jdbc URL)
Submit queries and read results from the database (including creating statements, returning result sets, iterating through the results, and properly closing result sets, statements, and connections)
Use JDBC transactions (including disabling auto-commit mode, committing and rolling back transactions, and setting and rolling back to savepoints)
Construct and use RowSet objects using the RowSetProvider class and the RowSetFactory interface
Create and use PreparedStatement and CallableStatement objects


Create and use the Thread class and the Runnable interface
Manage and control thread lifecycle
Synchronize thread access to shared data
Identify code that may not execute correctly in a multi-threaded environment.


Use collections from the java.util.concurrent package with a focus on the advantages over and differences from the traditional java.util collections.
Use Lock, ReadWriteLock, and ReentrantLock classes in the java.util.concurrent.locks package to support lock-free thread-safe programming on single variables.
Use Executor, ExecutorService, Executors, Callable, and Future to execute tasks using thread pools.
Use the parallel Fork/Join Framework


Read and set the locale by using the Locale object
Build a resource bundle for each locale
Call a resource bundle from an application
Format dates, numbers, and currency values for localization with the NumberFormat and DateFormat classes (including number format patterns)
Describe the advantages of localizing an application
Define a locale using language and country codes