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Oracle Java Certified Programmer Sample Questions:

1. Which statement is true for the class java.util.HashSet?

A) The elements in the collection are guaranteed to be unique.
B) The elements in the collection are ordered.
C) The elements in the collection are accessed using a unique key.
D) The collection is guaranteed to be immutable.
E) The elements in the collections are guaranteed to be synchronized.

2. CORRECT TEXT
Given:
1 . String foo = "base";
2 . foo.substring(0,3);
3 . foo.concat("ket");
4 . foo += "ball";
5 . Type the value of foo at line 8.

3. Given the ActionEvent, which method allows you to identify the affected component?

A) GetClass.
B) GetTargetComponent.
C) GetSource.
D) GetComponent.
E) GetTarget.

4. 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, it is still possible that the first thread might never resume execution.
B) 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.
C) 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.
D) 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.

5. Which two create an InputStream and open file the "file.txt" for reading? (Choose Two)

A) FileInputStream in=new FileReader(new File("file.txt"));
B) InputStream in=new FileReader("file.txt");
C) InputStream in=new FileInputStream("file.txt");
D) FileInputStream in=new FileInputStream(new File("file.txt"));
E) InputStream in=new InputStreamFileReader ("file.txt", "read");

Solutions: