100+ Free Java SE 8 Programmer I (OCAJP 8) Practice Questions

Working with Java Data Types

Declare and initialize primitives and wrapper classes, apply casting and numeric promotion, understand field versus local-variable defaults, variable scope, autoboxing, the Integer cache, and pass-by-value semantics.

Working with Methods and Encapsulation

Create overloaded methods and resolve overloads, apply the static keyword to methods and fields, create and overload constructors, apply access modifiers, and apply encapsulation using private fields with public accessors.

Working with Inheritance

Use polymorphism and runtime method dispatch, override methods correctly, distinguish reference type from object type, cast references safely, use super and this, and work with abstract classes and Java 8 interfaces including default and static methods.

Java Basics

Write a valid main method, structure source files to match the public class name, order package and import statements correctly, and rely on the implicitly imported java.lang package.

Using Operators and Decision Constructs

Apply Java operators and precedence, use parentheses to override precedence, compare objects with == versus equals, and build if/else, ternary, and switch constructs including fall-through behavior.

Using Loop Constructs

Create and compare for, enhanced for, while, and do/while loops, and control flow with break, continue, and labeled statements.

Handling Exceptions

Differentiate checked exceptions, unchecked exceptions, and Errors, build try/catch/finally blocks, understand finally-return override, and recognize common exceptions like NullPointerException, ArithmeticException, and ArrayIndexOutOfBoundsException.

Working with Selected Classes from the Java API

Create and manipulate Strings and StringBuilder, use the Arrays utility class and ArrayList, write simple lambda and Predicate expressions, and create and manipulate calendar data with LocalDate, LocalTime, LocalDateTime, DateTimeFormatter, and Period.

Creating and Using Arrays

Declare, instantiate, initialize, and use one-dimensional and multidimensional arrays including jagged arrays, and handle array bounds and default element values.