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Oracle 1Z0-501 Exam Syllabus Topics:

Oracle Java Certified Programmer Sample Questions:

Question 1

What writes the text "<end>" to the end of the file "file.txt"?

A. OutputStream out= new FileOutputStream ("file.txt");
Out.writeBytes ("<end>/n");
B. OutputStream os= new FileOutputStream ("file.txt", true);
DataOutputStream out = new DataOutputStream(os); out.writeBytes ("<end>/n");
C. OutputStream os= new FileOutputStream ("file.txt");
DataOutputStream out = new DataOutputStream(os); out.writeBytes ("<end>/n");
D. OutputStream os= new OutputStream ("file.txt", true);
DataOutputStream out = new DataOutputStream(os); out.writeBytes ("<end>/n");

Question 2

CORRECT TEXT
Exhibit:
1 . public class test {
2 . public static string output = ""
3 .
4 . public static void foo(int i) {
5 . try {
6 . if(i= =1) {
7 . throw new Exception ();
8 .}
9 . output += "1";
1 0. )
1 1. catch(Exception e) {
1 2. output += "2";
1 3. return;
1 4. )
1 5. finally (
1 6. output += "3";
1 7. )
1 8. output += "4";
1 9. )
2 0.
2 1. public static void main (string args[])(
2 2. foo(0);
2 3. foo(1);
2 4.
2 5.)
2 6. )
What is the value of the variable output at line 24?

Question 3

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 only return true if SyncTest is changed to allow x and y to be set separately.
C. Check() can return true when multiple threads call setX and setY separately.
D. Check() can return true when setXY is called by multiple threads.

Question 4

Which two create an instance of an array? (Choose Two)

A. Int ia [][] = (4, 5, 6) (1, 2, 3)
B. char[] ca = "Some String";
C. Object oa = new float[20];
D. int[] ia = new int [15];
E. float fa = new float [20];

Question 5

Given:
1 . public class X (
2 . public object m () {
3 . object o = new float (3.14F);
4 . object [] oa = new object [1];
5 . oa[0]= o;
6 . o = null;
7 . return oa[0];
8 . }
9 . }
When is the float object created in line 3, eligible for garbage collection?

A. Just after line 5
B. Never in this method.
C. Just after line 6
D. Just after line 7 (that is, as the method returns)

Solutions: