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Oracle Java Certified Programmer Sample Questions:

1. Given:
1 . String foo = "blue";
2 . Boolean[]bar = new Boolean [1];
3 . if (bar[0]){
4 .foo = "green";
5 .}
What is the result?

A) Foo has the value of ""
B) An exception is thrown.
C) The code will not compile.
D) Foo has the value of null.
E) Foo has the value of "blue"
F) Foo has the value of "green"

2. You are assigned the task of building a panel containing a TextArea at the top, a label directly below it, and a button directly below the label. If the three components are added directly to the panel. Which layout manager can the panel use to ensure that the TextArea absorbs all of the free vertical space when the panel is resized?

A) CardLayout.
B) GridLayout.
C) GridBagLayout.
D) BorderLayout.
E) FlowLayout.

3. Given:
1 . public class MethodOver {
2 . private int x, y;
3 . private float z;
4 . public void setVar(int a, int b, float c){
5 . x = a;
6 . y = b;
7 . z = c;
8 .}
9 . }
Which two overload the setVar method? (Choose Two)

A) public void setVar(int a, float b){
x = a;
z = b;
}
B) public void setVar(int a, float c, int b) {
this(a, b, c);
}
C) public void setVar(int a, float c, int b) {
setVar(a, b, c);
}
D) void setVar (int a, int b, float c){
x = a;
y = b;
z = c;
}
E) public void setVar(int ax, int by, float cz) {
x = ax;
y = by;
z = cz;
}

4. Exhibit:
1 . public class Mycircle {
2 . public double radius;
3 . public double diameter;
4 .
5 . public void setRadius(double radius)
6 . this.radius = radius;
7 . this.diameter= radius * 2;
8 .}
9 .
1 0. public double getRadius(){
1 1. return radius;
1 2.}
1 3. }
Which statement is true?

A) The diameter of a given MyCircle is guaranteed to be twice its radius.
B) The radius of a MyCircle object can be set without affecting its diameter.
C) Lines 6 and 7 should be in a synchronized block to ensure encapsulation.
D) The Mycircle class is fully encapsulated.

5. Exhibit:
1 . public class Test {
2 . public static void replaceJ(string text) {
3 . text.replace ('j', 'l');
4 .}
5 .
6 . public static void main(String args[]){
7 . string text = new String ("java")
8 . replaceJ(text);
9 . system.out.printIn(text);
1 0.}
1 1.}
What is the result?

A) The program prints "lava"
B) The program prints "java"
C) An error at line 7 causes compilation to fail.
D) Compilation succeeds but the program throws an exception.

Solutions: