Oracle 1z0-808 問題集

質問 1：
Given the code fragment:

What could expression1 and expression2 be, respectively, in order to produce output ?, 16?
A. A+ +, - - b
B. A + +, b - -
C. + +a, b- -
D. + +a, - -b
正解：C

質問 2：
Given:

What is the result?
A. Welcome Log 2:1
B. Hello Log 1:2
C. Hello Log 2:2
D. Welcome Log 1:2
正解：C
解説: (Topexam メンバーにのみ表示されます)

質問 3：
Given:

What is the result?
A. myStr: 7007, myNum: 9009
B. myStr: 7007, myNum: 7007
C. Error
D. myStr: 9009, myNum: 7007
正解：D
解説: (Topexam メンバーにのみ表示されます)

質問 4：
Given the code fragment:
StringBuilder sb = new StringBuilder();
sb.append("World");
Which fragment prints Hello World?
sb.insert(0, "Hello ");
A. System.out.println(sb);
sb.add(0, "Hello ");
B. System.out.println(sb);
C. System.out.println(sb);
sb.append(0, "Hello ");
D. System.out.println(sb);
sb.set(0, "Hello ");
正解：C

質問 5：
Given the following main method:

What is the result?
A. Nothing is printed
B. 5 4 3 2 1 0
C. 5 4 3 2 1
D. 4 2 1
E. 5
正解：E
解説: (Topexam メンバーにのみ表示されます)

質問 6：
Given:

What is the result?
A. Base
DerivedB
B. Base
DerivedA
C. DerivedB
DerivedA
D. DerivedB
DerivedB
E. A classcast Except ion is thrown at runtime.
正解：D

質問 7：
Given the code fragment:

And given the requirements:
1. Process all the elements of the array in the reverse order of entry.
2. Process all the elements of the array in the order of entry.
3. Process alternating elements of the array in the order of entry.
Which two statements are true? (Choose two.)
A. Requirement 3 CANNOT be implemented by using either the enhanced for loop or the standard for loop.
B. Requirements 2 and 3 CANNOT be implemented by using the standard for loop.
C. Requirement 2 can be implemented by using the enhanced for loop.
D. Requirements 1, 2, and 3 can be implemented by using the standard for loop.
E. Requirements 1, 2, and 3 can be implemented by using the enhanced for loop.
正解：B,D

質問 8：
Which two actions will improve the encapsulation of a class?
A. Returning a copy of the contents of an array or ArrayList instead of a direct reference
B. Changing the access modifier of a field from public to private
C. Removing the public modifier from a class declaration
D. Changing the return type of a method to void
正解：A,B

質問 9：
Given the code fragment:

What is the result?
A. Compilation fails
B. 103
C. 102
D. 101
E. 100
正解：A
解説: (Topexam メンバーにのみ表示されます)