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Oracle Java SE 8 Programmer I Sample Questions (Q291-Q296):

NEW QUESTION # 291
Given:
MainTest.java:

and commands:

What is the result?
String main 1

A. String main 123
B. An exception is thrown at runtime
String main 1 2 3
C.
D.

Answer: D

NEW QUESTION # 292
Given:

What is the result?

A. String main 123
B. String main 1 2 3
C. An exception is thrown at runtime
D. String main 1

Answer: D

NEW QUESTION # 293
Given the following two classes:

How should you write methods in the ElectricAccount class at line n1 so that the member variable bill is always equal to the value of the member variable kwh multiplied by the member variable rate?
Any amount of electricity used by a customer (represented by an instance of the customer class) must contribute to the customer's bill (represented by the member variable bill) through the method use Electricity method. An instance of the customer class should never be able to tamper with or decrease the value of the member variable bill.
A:

B:

C:

D:

A. Option C
B. Option A
C. Option B
D. Option D

Answer: B

NEW QUESTION # 294
Given the code fragment:
String h1 = "Bob";
String h2 = new String ("Bob");
What is the best way to test that the values of h1 and h2 are the same?

A. if (h1.equals(h2))
B. if (h1 = = h2)
C. if (h1 == h2)
D. if (h1.same(h2))

Answer: A

Explanation:
The equals method compares values for equality.
Incorrect answers:
The strings are not the same objects so the == comparison fails.
See note #1 below.
As the value of the strings are the same equals is true.
The equals compares values for equality.
There is no generic comparison method named same.
= = (with a space) is not a valid method.
Note: #1 ==
Compares references, not values.
The use of == with object references is generally limited to the following:
Comparing to see if a reference is null.
Comparing two enum values. This works because there is only one object for each enum constant.
You want to know if two references are to the same object.

NEW QUESTION # 295
Given:

What is the result?