Oracle Java Certified Programmer : 1Z0-501 exam

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Oracle 1Z0-501 Exam Syllabus Topics:

Oracle Java Certified Programmer Sample Questions:

1. 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 . oa[0] = null;
9 . return o;
9 . }
1 0.}
When is the float object created in line 3, eligible for garbage collection?

A) Just after line 8(that is, as the method returns).
B) Just after line 6.
C) Just after line 5.
D) Just after line 7.

2. 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 FileReader("file.txt");
C) InputStream in=new FileInputStream("file.txt");
D) FileInputStream in=new FileReader(new File("file.txt"));
E) FileInputStream in=new FileInputStream(new File("file.txt"));

3. 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 output is dependent on the threading model of the system the program is running on.
E) The program prints "ADCBADBC"

4. Exhibit:
1 . public class Mycircle {
2 . public double radius;
3 . public double diameter;
4 .
5 . public void setRadius(double radius)
6 . this.radius = radius;
7 . this.diameter= radius * 2;
8 .}
9 .
1 0. public double getRadius(){
1 1. return radius;
1 2.}
1 3. }
Which statement is true?

A) The diameter of a given MyCircle is guaranteed to be twice its radius.
B) Lines 6 and 7 should be in a synchronized block to ensure encapsulation.
C) The radius of a MyCircle object can be set without affecting its diameter.
D) The Mycircle class is fully encapsulated.

5. Exhibit:
1 . import java.awt*;
2 .
3 .public class X extends Frame (
4 .public static void main(string []args)(
5 .X x = new X ();
6 . X.pack();
7 . x.setVisible(true);
8 .)
9 .
1 0. public X ()(
1 1. setlayout (new GridLayout (2,2));
1 2.
1 3. Panel p1 = new panel();
1 4. Add(p1);
1 5. Button b1= new Button ("One");
1 6. P1.add(b1);
1 7.
1 8. Panel p2 = new panel();
1 9. Add(p2);
2 0. Button b2= new Button ("Two");
2 1. P2.add(b2);
2 2.
2 3. Button b3= new Button ("Three");
2 4. add(b3);
2 5.
2 6. Button b4= new Button ("Four");
2 7. add(b4);
2 8.)
2 9. )
Which two statements are true? (Choose Two)

A) Both width and height of the button labeled "Three" might change if the Frame is resized.
B) All the buttons change width if the Frame width is resized.
C) All the buttons change height if the frame height is resized.
D) The size of the button labeled "One" is constant even if the Frame is resized.

Solutions: