Oracle 1Z0-501 : Java Certified Programmer

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Oracle Java Certified Programmer Sample Questions:

1. Given:
1 . public class ArrayTest {
2 . public static void main (String[]args){
3 . float f1[], f2[];
4 . f1 = new float [10];
5 . f2 = f1;
6 . System.out.printIn ("f2[0]=" + f2[0]);
7 .}
8 .}
What is the result?

A) An error at line 6 causes compile to fail.
B) It prints f2[0] = NaN
C) It prints f2[0] = 0.0
D) An error at line 5 causes compile to fail.
E) An error at line 6 causes an exception at runtime.

2. Given:
1 . public class ConstOver {
2 . public ConstOver (int x, int y, int z){
3 .}
4 . }
Which two overload the ConstOver constructor? (Choose Two)

A) Public void ConstOver (byte x, byte y, byte z) { }
B) Private ConstOver (int z, int y, byte x) { }
C) ConstOver ( ) { }
D) Protected int ConstOver ( ) { }
E) Public Object ConstOver (int x, int y, int z) { }

3. Given:
1. public class foo {
2 . static String s;
3 . public static void main (String[]args) {
4 . system.out.printIn ("s=" + s);
5 . }
6 . }
What is the result?

A) The code compiles and "s=null" is printed.
B) The code does not compile because string s is not initialized.
C) The code compiles and "s=" is printed.
D) The code compiles, but a NullPointerException is thrown when toString is called.
E) The code does not compile because string s cannot be referenced.

4. Given:
1. public class Foo {
2 . public static void main (String [] args){
3 .StringBuffer a = new StringBuffer ("A");
4 .StringBuffer b = new StringBuffer ("B");
5 .operate (a,b);
6 .system.out.printIn{a + "," +b};
7 . )
8 . static void operate (StringBuffer x, StringBuffer y){
9 .x.append {y};
1 0.y = x;
1 1.)
1 2.}
What is the result?

A) The code does not compile because "+" cannot be overloaded for StringBuffer.
B) The code compiles and prints "A,A".
C) The code compiles and prints "AB,B".
D) The code compiles and prints "A,B".
E) The code compiles and prints "B,B".
F) The code compiles and prints "AB,AB".

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 BordrLayout());
1 2. Panel p = new Panel ();
1 3. add(p, BorderLayout.NORTH);
1 4. Button b = new Button ("North");
1 5. p.add(b):
1 6. Button b = new Button ("South");
1 7. add(b1, BorderLayout.SOUTH):
1 8.}
1 9.}
Which two statements are true? (Choose Two)

A) The height of the button labeled "South" can very if the Frame is resized.
B) The width of the button labeled "North" is constant even if the Frame is resized.
C) The buttons labeled "North" and "South" will have the same height.
D) The width of the button labeled "South" is constant even if the Frame is resized.
E) The height of the button labeled "North" can very if the Frame is resized.
F) The buttons labeled "North" and "South" will have the same width.

Solutions: