Braindumps for "310-055" Exam

Sun Certified Programmer for the Java 2 Platform, Standard Edition 5.0

 Question 181.
Given:
1. public class Test {
2. public static void main(String args[]) {
3. class Foo {
4. public int i = 3; }
5. Object o = (Object)new Foo();
6. Foo foo = (Foo)o;
7. System.out.println ("i = " + foo.i); } }
What is the result?

A. i = 3
B. Compilation fails.
C. A ClassCastException is thrown at line 6.
D. A ClassCastException is thrown at line 7.

Answer: A

Question 182.
Which two cause a compiler error? (Choose two)

A. float[] = new float(3);
B. float f2[] = new float[];
C. float[] f1 = new float[3];
D. float f3[] = new float[3];
E. float f5[] = { 1.0f, 2.0f, 2.0f };
F. float f4[] = new float[] { 1.0f. 2.0f. 3.0f};

Answer: A, B

Question 183.
Which statement is true?

A. Memory is reclaimed by calling Runtime.gc ().
B. Objects are not collected if they are accessible from live threads.
C. Objects that have finalize () methods are never garbage collected.
D. Objects that have finalize () methods always have their finalize () methods called before the 
     program ends.
E. An Out Of Memory error is only thrown if a single block of memory cannot be found that is large 
     enough for a particular requirement.

Answer: B

Question 184.
You want a class to have access to members of another class in the same package. Which is the most restrictive access that accomplishes this objective?

A. public
B. private
C. protected
D. transient
E. default access

Answer: E

Question 185.
Which statement is true about assertion in the Java programming language?

A. Assertion expressions should not contain side effects.
B. Assertion expression values can be any primitive type.
C. Assertion should be used for enforcing preconditions on public methods.
D. An Assertion Error thrown as a result of a failed assertion should always be handled by the 
    enclosing method.

Answer: A

Question 186.
Which three statements are true? (Choose three)

A. The default constructor initializes method variables.
B. The default constructor has the same access as its class.
C. The default constructor invoked the no-arg constructor of the super class.
D. If a class lacks a no-arg constructor, the compiler always creates a default constructor.
E. The compiler creates a default constructor only when there are no other constructors for the 
     class.

Answer: B, C, E

Question 187.
Which three statements are true? (Choose three)

A. Assertion checking is typically enabled when a program is deployed.
B. It is never appropriate to write code to handle failure of an assert statement.
C. Assertion checking is typically enabled during program development and testing.
D. Assertion checking can be selectively enabled or disable a per-package basis, but not on a 
     per-class basis.
E. Assertion checking can be selectively enabled or disabled on both a per-package basis and a 
    per-class basis.

Answer: B, C, E

Question 188.
You want to limit access to a method of a public class to members of the same class. Which access accomplishes this objective?

A. public
B. private
C. protected
D. transient
E. default access

Answer: B

Question 189.
Which fragment is an example of inappropriate use of assertions?

A. assert (! (map.contains(x))); map.add(x);
B. if (x > 0) { } else {assert (x==0);}
C. public void aMethod (int x) {assert (x > 0);}
D. assert (invariantCondition ());return retval;
E. switch (x) {case 1: break;case 2: creak; default: assert (x == 0);

Answer: C

Question 190.
Which four can be thrown using the throw statement? (Choose four)

A. Error
B. Event
C. Object
D. Throwable
E. Exception
F. RuntimeException

Answer: A, D, E, F

Question 191.
Which two are benefits of fully encapsulating a class? (Choose two)

A. Performance of class methods is improved.
B. Implementation details of the class are hidden.
C. Access modifiers can be omitted on class data members.
D. Code that uses the encapsulation class can access data members directly.
E. Internal operation of the class can be modified without impacting clients of that class.

Answer: B, E

Question 192.
What can cause a thread to become non-runnable?

A. Exiting from a synchronized block.
B. Calling the wait method on an object.
C. Calling the notify method on an object.
D. Calling the notifyAll method on an object.

Answer: B

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