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Oracle Java Certified Programmer Sample Questions:

1. Exhibit:
1 . import java.io.IOException;
2 . public class ExceptionTest(
3 . public static void main (String[]args)
4 . try (
5 . methodA();
6 .) catch (IOException e)(
7 . system.out.printIn("Caught IOException");
8 .) catch (Exception e)(
9 . system.out.printIn("Caught Exception");
1 0.)
1 1. )
1 2. public void methodA (){
1 3. throw new IOException ();
14.)
15. )
What is the result?

A) The program executes normally without printing a message.
B) The output is caught exception.
C) The code will not compile.
D) The output is caught IOException.

2. Which can be used to encode charS for output?

A) Java.io.EncodeWriter.
B) Java.io.OutputStreamWriter.
C) Java.io.OutputStream.
D) Java.io.BufferedOutputStream.
E) Java.io.EncodeOutputStream.

3. Exhibit:
1 . import java.awt.*;
2 .
3 . public class Test extends Frame {
4 . public Test(){
5 . add(new Label("Hello"));
6 . add(new TextField("Hello"));
7 . add(new Button("Hello"));
8 . pack();
9 . show();
1 0. }
1 1.
1 2. public static void main(String args[]) {
1 3.new Test ();
1 4.}
1 5. )
What is the result?

A) The code will not compile.
B) A Window will appear containing a Label at the top, a TextField below the Label, and a Buttonbelow the TextField.
C) An IllegalArgumentException is thrown at line 6.
D) A Window will appear containing only a Button.
E) A Window button will appear but will not contain the Label, TextField, or Button.
F) A Window will appear containing a Label on the left, a TextField to the right of the Label, and abutton to the right of the TextField.

4. Exhibit:
1 . class super (
2 . public int I = 0;
3 .
4 . public super (string text) (
5 . I = 1
6 .)
7 .)
8 .
9 . public class sub extends super (
1 0. public sub (string text) (
1 1. i= 2
1 2. )
1 3.
1 4. public static void main (straing args[]) (
1 5. sub sub = new sub ("Hello");
1 6. system.out. PrintIn(sub.i);
1 7.)
1 8. )
What is the result?

A) Compilation will succeed and the program will print "2"
B) Compilation will succeed and the program will print "0"
C) Compilation will fail.
D) Compilation will succeed and the program will print "1"

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

Solutions: