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Oracle Java Certified Programmer Sample Questions:

1. 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 button will appear but will not contain the Label, TextField, or Button.
C) A Window will appear containing only a Button.
D) A Window will appear containing a Label at the top, a TextField below the Label, and a Buttonbelow the TextField.
E) 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.
F) An IllegalArgumentException is thrown at line 6.

2. Given:
1 . public class returnIt (
2 . returnType methodA(byte x, double y) (
3 . return (short) x/y * 2;
4 .)
5 . )
What is the valid returnType for methodA in line 2?

A) Short
B) Byte
C) Float
D) Double
E) Long
F) Int

3. Given:
1. class super {
2. public float getNum() {return 3.0f;}
3 . )
4 .
5 . public class Sub extends Super {
6 .
7 .)
Which method, placed at line 6, will cause a compiler error?

A) Public float getNum(){return 4.0f; }
B) Public void getNum (double d)
{ }
C) Public double getNum (float d) {retrun 4.0f; }
D) Public void getNum () { }

4. Exhibit:
1 . class A {
2 . public byte getNumber (){
3 .return 1;
4 .}
5 .}
6 .
7 . class B extends A {
8 . public short getNumber() {
9 . return 2;
1 0. }
1 1.
1 2. public static void main (String args[]) {
1 3.B b = new B ();
1 4.System.out.printIn(b.getNumber())
1 5.}
1 6. }
What is the result?

A) Compilation succeeds and 2 is printed.
B) An error at line 8 causes compilation to fail.
C) An error at line 14 causes compilation to fail.
D) Compilation succeeds but an exception is thrown at line 14.
E) Compilation succeeds and 1 is printed.

5. 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 "1"
B) Compilation will succeed and the program will print "0"
C) Compilation will fail.
D) Compilation will succeed and the program will print "2"

Solutions: