Oracle 1Z0-803 問題集

質問 1：
Given the code in a file Traveler.java:

And the commands:
Javac Traveler.java
Java Traveler Java Duke
What is the result?
A. Happy Journey! Java
B. The program fails to execute due to a runtime error
C. Happy Journey! Duke
D. An exception is thrown at runtime
正解：C

質問 2：
The catch clause argument is always of type__________.
A. Exception but NOT including RuntimeException
B. CheckedException
C. Throwable
D. RuntimeException
E. Error
F. Exception
正解：C
解説: (Topexam メンバーにのみ表示されます)

質問 3：
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. Compilation fails due to an error on line 1.
C. 1002
D. An exception is thrown at run time due to error on line 3
正解：A
解説: (Topexam メンバーにのみ表示されます)

質問 4：
Given:

Which two code fragments are valid?

A. Option E
B. Option A
C. Option C
D. Option D
E. Option B
正解：C,E
解説: (Topexam メンバーにのみ表示されます)

質問 5：
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
解説: (Topexam メンバーにのみ表示されます)

質問 6：
Given:

Which code fragment, when inserted at line 9, enables the code to print true?
A. String str2 = str1;
B. String str2 = new string (str1);
C. String str2 = sb1.toString();
D. String str2 = "Duke";
正解：A

質問 7：
Given the code fragment:

What is the result?
A. 3 false 1
B. 2 true 1
C. 2 true 3
D. 2 false 1
E. 2 false 3
F. 3 false 3
G. 3 true 1
正解：G
解説: (Topexam メンバーにのみ表示されます)

質問 8：
Given the code fragment

Which code fragments, inserted independently, enable the code compile?
A. t.fvar = 200;
B. cvar = 400;
C. t.fvar = 200; Test2.cvar = 400;
D. this.fvar = 200; Test2.cvar = 400;
E. fvar = 200; cvar = 400;
F. this.fvar = 200; this.cvar = 400;
正解：A,B,C