Oracle 1Z0-815

Oracle Java SE 11 Programmer I 認定 1Z0-815 試験問題:

1. Which two statements are true for a two-dimensional array?

A) It is implemented as an array of the specified element type.
B) Using a row by column convention, each row of a two-dimensional array must be of the same size
C) All methods of the class Object may be invoked on the two-dimensional array.
D) At declaration time, the number of elements of the array in each dimension must be specified

2. Given the code fragment:

What is the output?

A) [-3, -2, -1]
B) A runtime exception is thrown.
C) [-1, -2, -3]
D) The compilation fails.

3. Given:

Which two statements are valid to be written in this interface? (Choose two.)

A) final void methodG(){
System.out.println("G");
}
B) public abstract void methodB();
C) public void methodF(){
System.out.println("F");
}
D) public String methodD();
E) final void methodE();
F) private abstract void methodC();
G) public int x;

4. Given the code fragment:
1. ArrayList<Integer> list = new ArrayList<>(1);
2. list.add(1001);
3. list.add(1002);
4. System.out.println(list.get(list.size()));
What is the result?

A) An exception is thrown at run time due to error on line 4
B) 1002
C) An exception is thrown at run time due to error on line 3
D) Compilation fails due to an error on line 1.

5. Given:

What is the result?

A) Good Morning, Harry
B) Good Night, Harry
C) Good Night, Potter
D) Good Morning, Potter

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