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Oracle 1Z0-501 Exam Syllabus Topics:

Oracle Java Certified Programmer Sample Questions:

1. Exhibit
1 . public class SyncTest{
2 . public static void main(String[] args){
3 . final StringBuffer s1= new StringBuffer();
4 . final StringBuffer s2= new StringBuffer();
5 . new Thread (){
6 .public void run() {
7 .synchronized(s1) {
8 .s2.append("A");
9 .synchronized(s2) {
1 0. s2.append("B");
1 1.System.out.print(s1);
1 2.System.out.print(s2);
1 3. }
1 4.}
1 5.}
1 6. }.start();
1 7. new Thread() {
1 8. public void run() {
1 9.synchronized(s2) {
2 0.s2.append("C");
2 1.synchronized(s1) {
2 2.s1.append("D");
2 3.System.out.print(s2);
2 4.System.out.print(s1);
2 5.}
2 6.}
2 7.}
2 8.}.start();
2 9.}
3 0. }
Which two statements are true? (Choose Two)

A) The program prints "ABBCAD"
B) The output is a non-deterministic point because of a possible deadlock condition.
C) The program prints "CDDACB"
D) The program prints "ADCBADBC"
E) The output is dependent on the threading model of the system the program is running on.

2. Given:
1 . public class SyncTest (
2 . private int x;
3 . private int y;
4 . private synchronized void setX (int i) (x=1;)
5 . private synchronized void setY (int i) (y=1;)
6 . public void setXY(int 1)(set X(i); setY(i);)
7 . public synchronized Boolean check() (return x !=y;)
8 . )
Under which conditions will check () return true when called from a different class?

A) Check() can never return true.
B) Check() can return true when multiple threads call setX and setY separately.
C) Check() can only return true if SyncTest is changed to allow x and y to be set separately.
D) Check() can return true when setXY is called by multiple threads.

3. Exhibit:
1 . public class X {
2 . public static void main (String[]args) {
3 . String s1 = new String ("true");
4 . Boolean b1 = new Boolean (true);
5 . if (s2.equals(b1)){
6 . System.out.printIn("Equal");
7 .}
8 .}
9 .}
What is the result?

A) The program runs and prints "Equal"
B) The program runs and prints nothing.
C) An error at line 5 causes compilation to fail.
D) The program runs but aborts with an exception.

4. Which two are equivalent? (Choose Two)

A) 16>4
B) 16/2^2
C) 16>>2
D) 16*4
E) 16>>>2
F) 16/2

5. Given:
1. class super {
2. public float getNum() {return 3.0f;}
3 . )
4 .
5 . public class Sub extends Super {
6 .
7 .)
Which method, placed at line 6, will cause a compiler error?

A) Public void getNum (double d)
{ }
B) Public float getNum(){return 4.0f; }
C) Public void getNum () { }
D) Public double getNum (float d) {retrun 4.0f; }

Solutions: