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

2. Which statement is true?

A) The grid bag layout can be used to give a grid-like layout which differs from the normal grid inthat individual rows and columns can have unique sizes.
B) A grid layout can be used to position a component tat should maintain a constant size even whenthe container is resized.
C) If two components are placed in the same column of a grid bag layout, and one component resizes horizontally, then the other component must resize horizontally.
D) A border layout can be used to position component that should maintain a constant size even whenthe container is resized.
E) A flow layout can be used to position a component that should resize horizontally when thecontainer is resized.

3. Exhibit:
1 . public class SwitchTest {
2 . public static void main (String []args){
3 . System.out.PrintIn("value =" +switchIt(4));
4 .}
5 . public static int switchIt(int x){
6 . int j = 1;
7 . switch (x) {
8 . case 1: j++;
9 . case 2: j++;
1 0. case 3: j++;
1 1. case 4: j++;
1 2. case 5: j++;
1 3. default:j++;
1 4. }
1 5. return j + x;
1 6. }
1 7.}
What is the output from line 3?

A) Value = 7
B) Value = 3
C) Value = 6
D) Value = 4
E) Value = 8
F) Value = 5

4. Exhibit:
1 . int I=1, j=0
2 .
3 . switch(i){
4 . case 2:
5 . j+=6;
6 .
7 . case 4:
8 . j+=1;
9 .
1 0. default:
1 1. j +=2;
1 2.
1 3. case 0:
1 4. j +=4;
1 5. }
1 6.
What is the value of j at line 16?

A) 2
B) 4
C) 0
D) 6
E) 1

5. Which can be used to decode charS for output?

A) Java.io.EncodedReader.
B) Java.io.InputStream.
C) Java.io.InputStreamWriter.
D) Java.io.InputStreamReader.
E) Java.io.BufferedInputStream.

Solutions: