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Oracle Java Certified Programmer Sample Questions:

1. Exhibit:
1 . class A {
2 . public String toString (){
3 . return "4";
4 .}
5 .}
6 . class B extends A {
7 .8.public String toString (){
8 . return super.toString()+ "3";
9 .}
1 0. }
1 1. public class Test {
1 2. public static void main(String[]args){
1 3.System.out.printIn(new B());
1 4.}
15.}
What is the result?

A) Compilation succeeds and 43 is printed.
B) Compilation succeeds but an exception is thrown at line 9.
C) An error on line 9 causes compilation to fail.
D) Compilation succeeds and 4 is printed.
E) An error on line 14 causes compilation to fail.

2. Which statement is true?

A) 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.
B) 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.
C) 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.
D) 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.

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

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

4. Given:
1 . public class ArrayTest {
2 . public static void main (String[]args){
3 . float f1[], f2[];
4 . f1 = new float [10];
5 . f2 = f1;
6 . System.out.printIn ("f2[0]=" + f2[0]);
7 .}
8 .}
What is the result?

A) It prints f2[0] = 0.0
B) An error at line 5 causes compile to fail.
C) An error at line 6 causes compile to fail.
D) It prints f2[0] = NaN
E) An error at line 6 causes an exception at runtime.

5. The file "file.txt" exists on the file system and contsins ASCII text.
Given:
3 8. try {
3 9. File f = new File("file.txt");
4 0. OutputStream out = new FileOutputStream(f, true);
4 1. }
4 2. catch (IOException){}
What is the result?

A) The code does not compile.
B) The code runs and sets the length of the file to 0.
C) An exception is thrown because the file is not closed.
D) The code runs and deletes the file from the file system.
E) The code runs and no change is made to the file.

Solutions: