SCJP 6
The objectives for the Sun Certified Programmer for the Java Platform Standard
Edition 6 (CX-310-065) exam, also called SCJP 1.6 exam, are defined by Sun, and
can be found at:
http://www.sun.com/training/catalog/courses/CX-310-065.xml
The objectives are organized in sections, and each section is reproduced verbatim.
The first 72 questions to this exams have been kindly given by Khalid Mughal from the University of Bergen, Norway, and co-author of the very good Programmer's Guide to Java SCJP Certification book.
| Released | Beta | Frozen | ||
|---|---|---|---|---|
Section 1: Declarations, Initialization, and Scope |
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1.1 1 question
Develop code that declares classes (including abstract and all forms of nested
classes), interfaces, and enums, and includes the appropriate use of package and
import statements (including static imports).
|
5 | 5 | 3 | |
1.2 1 question
Develop code that declares an interface. Develop code that implements or extends
one or more interfaces. Develop code that declares an abstract class. Develop code
that extends an abstract class.
|
2 | 5 | 1 | |
1.3 1 question
Develop code that declares, initializes, and uses primitives, arrays, enums, and
objects as static, instance, and local variables. Also, use legal identifiers for variable names.
|
7 | 20 | 3 | |
1.4 1 question
Develop code that declares both static and non-static methods, and—if appropriate—
use method names that adhere to the JavaBeans naming standards. Also
develop code that declares and uses a variable-length argument list.
|
0 | 0 | 3 | |
1.5 1 question
Given a code example, determine if a method is correctly overriding or overloading
another method, and identify legal return values (including covariant
returns), for the method.
|
5 | 12 | 5 | |
1.6 1 question
Given a set of classes and superclasses, develop constructors for one or more of
the classes. Given a class declaration, determine if a default constructor will be
created and, if so, determine the behavior of that constructor. Given a nested or
non-nested class listing, write code to instantiate the class.
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3 | 3 | 6 | |
Section 2: Flow Control |
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2.1 1 question
Develop code that implements an if or switch statement; and identify legal argument
types for these statements.
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1 | 3 | 2 | |
2.2 1 question
Develop code that implements all forms of loops and iterators, including the use of
for, the enhanced for loop (for-each), do, while, labels, break, and continue; and
explain the values taken by loop counter variables during and after loop execution.
|
3 | 0 | 3 | |
2.3 1 question
Develop code that makes use of assertions, and distinguish appropriate from
inappropriate uses of assertions.
|
2 | 0 | 0 | |
2.4 1 question
Develop code that makes use of exceptions and exception handling clauses (try,
catch, finally), and declares methods and overriding methods that throw
exceptions.
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2 | 4 | 4 | |
2.5 1 question
Recognize the effect of an exception arising at a specified point in a code fragment.
Note that the exception may be a runtime exception, a checked exception,
or an error.
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0 | 3 | 1 | |
2.6 1 question
Recognize situations that will result in any of the following being thrown:
ArrayIndexOutOfBoundsException, ClassCastException, IllegalArgumentException,
IllegalStateException, NullPointerException, NumberFormatException, AssertionError,
ExceptionInInitializerError, StackOverflowError, or NoClassDefFoundError. Understand
which of these are thrown by the virtual machine and recognize situations
in which others should be thrown programmatically.
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0 | 5 | 1 | |
Section 3: API Contents |
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3.1 1 question
Develop code that uses the primitive wrapper classes (such as Boolean, Character,
Double, Integer, etc.), and/or autoboxing & unboxing. Discuss the differences
between the String, StringBuilder, and StringBuffer classes.
|
4 | 8 | 2 | |
3.2 1 question
Given a scenario involving navigating file systems, reading from files, or writing
to files, or interacting with the user, develop the correct solution using the following classes (sometimes in combination), from java.io: BufferedReader, BufferedWriter, File, FileReader, FileWriter, PrintWriter, and Console.
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2 | 2 | 0 | |
3.3 1 question
Develop code that serializes and/or de-serializes objects using the following APIs
from java.io: DataInputStream, DataOutputStream, FileInputStream, FileOutputStream,
ObjectInputStream, ObjectOutputStream and Serializable.
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2 | 1 | 5 | |
3.4 1 question
Use standard J2SE APIs in the java.text package to correctly format or parse
dates, numbers, and currency values for a specific locale; and, given a scenario,
determine the appropriate methods to use if you want to use the default locale or
a specific locale. Describe the purpose and use of the java.util.Locale class.
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0 | 1 | 2 | |
3.5 1 question
Write code that uses standard J2SE APIs in the java.util and java.util.regex packages
to format or parse strings or streams. For strings, write code that uses the
Pattern and Matcher classes and the String.split method. Recognize and use regular
expression patterns for matching (limited to: . (dot), * (star), + (plus), ?, \d, \s, \w, [], ()). The use of *, +, and ? will be limited to greedy quantifiers, and the
parenthesis operator will only be used as a grouping mechanism, not for capturing
content during matching. For streams, write code using the Formatter and
Scanner classes and the PrintWriter.format/printf methods. Recognize and use
formatting parameters (limited to: %b, %c, %d, %f, %s) in format strings.
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4 | 5 | 2 | |
Section 4: Concurrency |
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4.1 1 question
Write code to define, instantiate, and start new threads using both
java.lang.Thread and java.lang.Runnable.
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1 | 8 | 2 | |
4.2 1 question
Recognize the states in which a thread can exist, and identify ways in which a
thread can transition from one state to another.
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1 | 2 | 3 | |
4.3 1 question
Given a scenario, write code that makes appropriate use of object locking to protect
static or instance variables from concurrent access problems.
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2 | 0 | 1 | |
4.4 1 question
Given a scenario, write code that makes appropriate use of wait, notify, or notifyAll.
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3 | 1 | 1 | |
Section 5: OO Concepts |
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5.1 1 question
Develop code that implements tight encapsulation, loose coupling, and high
cohesion in classes, and describe the benefits.
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0 | 1 | 1 | |
5.2 1 question
Given a scenario, develop code that demonstrates the use of polymorphism. Further,
determine when casting will be necessary and recognize compiler versus
runtime errors related to object reference casting.
|
1 | 1 | 1 | |
5.3 1 question
Explain the effect of modifiers on inheritance with respect to constructors,
instance or static variables, and instance or static methods.
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1 | 0 | 0 | |
5.4 1 question
Given a scenario, develop code that declares and/or invokes overridden or overloaded
methods and code that declares and/or invokes superclass or overloaded
constructors.
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1 | 2 | 1 | |
5.5 1 question
Develop code that implements “is-a” and/or “has-a” relationships.
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1 | 1 | 1 | |
Section 6: Collections / Generics |
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6.1 1 question
Given a design scenario, determine which collection classes and/or interfaces
should be used to properly implement that design, including the use of the
Comparable interface.
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1 | 17 | 0 | |
6.2 1 question
Distinguish between correct and incorrect overrides of corresponding hashCode
and equals methods, and explain the difference between == and the equals
method.
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3 | 1 | 3 | |
6.3 1 question
Write code that uses the generic versions of the Collections API, in particular, the
Set, List, and Map interfaces and implementation classes. Recognize the limitations
of the non-generic Collections API and how to refactor code to use the generic
versions. Write code that uses the NavigableSet and NavigableMap interfaces.
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6 | 2 | 4 | |
6.4 1 question
Develop code that makes proper use of type parameters in class/interface declarations,
instance variables, method arguments, and return types; and write
generic methods or methods that make use of wildcard types and understand the
similarities and differences between these two approaches.
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4 | 2 | 2 | |
6.5 1 question
Use capabilities in the java.util package to write code to manipulate a list by sorting,
performing a binary search, or converting the list to an array. Use capabilities
in the java.util package to write code to manipulate an array by sorting, performing
a binary search, or converting the array to a list. Use the java.util.Comparator
and java.lang.Comparable interfaces to affect the sorting of lists and arrays. Furthermore,
recognize the effect of the "natural ordering" of primitive wrapper
classes and java.lang.String on sorting.
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0 | 1 | 1 | |
Section 7: Fundamentals |
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7.1 1 question
Given a code example and a scenario, write code that uses the appropriate access
modifiers, package declarations, and import statements to interact with (through
access or inheritance) the code in the example.
|
4 | 1 | 3 | |
7.2 1 question
Given an example of a class and a command-line, determine the expected runtime
behavior.
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1 | 0 | 0 | |
7.3 1 question
Determine the effect upon object references and primitive values when they are
passed into methods that perform assignments or other modifying operations on
the parameters.
|
3 | 0 | 0 | |
7.4 1 question
Given a code example, recognize the point at which an object becomes eligible for
garbage collection, and determine what is and is not guaranteed by the garbage
collection system, and recognize the behaviors of the Object.finalize() method.
|
2 | 0 | 2 | |
7.5 1 question
Given the fully-qualified name of a class that is deployed inside and/or outside a
JAR file, construct the appropriate directory structure for that class. Given a code
example and a classpath, determine whether the classpath will allow the code to
compile successfully.
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1 | 0 | 0 | |
7.6 1 question
Write code that correctly applies the appropriate operators including assignment
operators (limited to: =, +=, -=), arithmetic operators (limited to: +, -, *, /,
%, ++, --), relational operators (limited to: <, <=, >, >=, ==, !=), the instanceof
operator, logical operators (limited to: &, |, ^, !, &&, ||), and the conditional
operator ( ? : ), to produce a desired result. Write code that determines the equality
of two objects or two primitives.
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2 | 3 | 4 | |
Exam information
- 55 minutes
- 37 questions (273)
- 70% required
- +1 √
- - 15 points
- 15 day delay
- status: released
