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Oracle Java Certified Programmer Sample Questions:

1. Given:
8 . int index = 1;
9 . int [] foo = new int [3];
1 0.int bar = foo [index];
1 1.int baz = bar + index;
What is the result?

A) An exception is thrown.
B) Baz has the value of 2
C) The code will not compile.
D) Baz has the value of 1
E) Baz has the value of 0

2. What is the numerical range of a char?

A) -32768 . . . 32767
B) 0 . . . 32767
C) Range is platform dependent.
D) 0 . . . 65535
E) -256 . . . 255

3. Which constructs a DataOutputStream?

A) New dataInputStream("in.txt");
B) New dataInputStream(new FileInputStream("in.txt"));
C) New dataInputStream(new writer("in.txt"));
D) New dataInputStream(new FileWriter("in.txt"));
E) New dataInputStream(new file("in.txt"));
F) New dataInputStream(new InputStream("in.txt"));

4. Given:
1 . public class Test {
2 . public static void main (String []args){
3 . unsigned byte b = 0;
4 . b--;
5 .
6 .}
7 . }
What is the value of b at line 5?

A) 127
B) 255
C) Compilation will fail.
D) -1
E) Compilation will succeed but the program will throw an exception at line 4.

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

Solutions: