Oracle 1Z0-501 real exam prep : Java Certified Programmer

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Oracle 1Z0-501 Exam Syllabus Topics:

Oracle Java Certified Programmer Sample Questions:

1. Which will declare a method that forces a subclass to implement it?

A) Public double methoda();
B) Protected void methoda (double d1){}
C) Abstract public void methoda();
D) Public native double methoda();
E) Static void methoda (double d1) {}

2. Which statement is true?

A) If a thread is blocked in the wait method of an object, and another thread executes the notify method on the same object, then the first thread definitely resumes execution as a direct and sole consequence of the notify call.
B) If only one thread is blocked in the wait method of an object, and another thread executes the modify on that same object, then the first thread immediately resumes execution.
C) If a thread is blocked in the wait method of an object, and another thread executes the notify method on the same object, it is still possible that the first thread might never resume execution.
D) If two threads are blocked in the wait method of one object, and another thread executes the notify method on the same object, then the first thread that executed the wait call first definitely resumes execution as a direct and sole consequence of the notify call.

3. Given:
1 . public class X {
2 . public object m () {
3 . object o = new float (3.14F);
4 . object [] oa = new object [1];
5 . oa[0]= o;
6 . o = null;
7 . oa[0] = null;
9 . return o;
9 . }
1 0.}
When is the float object created in line 3, eligible for garbage collection?

A) Just after line 7.
B) Just after line 6.
C) Just after line 5.
D) Just after line 8(that is, as the method returns).

4. Which two statements are true regarding the creation of a default constructor? (Choose Two)

A) The compiler always creates a default constructor for every class.
B) The default constructor initializes method variables.
C) The default constructor invokes the no-parameter constructor of the superclass.
D) When a class has only constructors with parameters, the compiler does not create a defaultconstructor.
E) The default constructor initializes the instance variables declared in the class.

5. Given:
1 . public class Test {
2 . public static void main (String[]args) {
3 . String foo = args[1];
4 . String bar = args[2];
5 . String baz = args[3];
6 . System.out.printIn("baz = " + baz);
7 .}
8 . }
And the output:
Baz = 2
Which command line invocation will produce the output?

A) Java Test 4 3 2 1
B) Java Test 1 2 3 4
C) Java Test 2222
D) Java Test 4 2 4 2

Solutions: