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Oracle 1Z0-501 Exam Syllabus Topics:

Oracle Java Certified Programmer Sample Questions:

1. Which two construct an OutputSream that appends to the file "file.txt"? (Choose Two)

A) FileOutputStream out=new FileOutputStream(new file("file.txt"));
B) OutputStream out=new FileOutputStream(new File("file.txt")true);
C) FileOutputStream out=new FileOutputStream("file.txt", true);
D) OutputStream out=new FileOutputStream("file.txt", "append");
E) OutputStream out=new FileOutputStream("file.txt");

2. You want a class to have access to members of another class in the same package. Which is the most restrictive access modifier that will accomplish that will accomplish this objective?

A) Private
B) No access modifier is required.
C) Public
D) Transient
E) Protected

3. Which constructs a BufferedIputStream?

A) New BufferedInputStream("in.txt");
B) New BufferedInputStream(new Writer("in.txt"));
C) New BufferedInputStream(new File("in.txt"));
D) New BufferedInputStream(new Writer("in.txt"));
E) New BufferedInputStream(new FileInputStream("in.txt"));
F) New BufferedInputStream(new InputStream("in.txt"));

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

5. Given:
1 . class BaseClass{
2 . private float x= 1.0f;
3 . protected void setVar (float f) {x = f;}
4 . }
5 . class SubClass exyends BaseClass {
6 . private float x = 2.0f;
7 . //insert code here
8 .}
Which two are valid examples of method overriding? (Choose Two)

A) Void setVar(float f) {x = f;}
B) Public void setVar(float f) {x = f;}
C) Public void setVar(int f) {x = f;}
D) Public final void setVar(float f) {x = f;}
E) Protected float setVar() {x=3.0f; return 3.0f; }
F) Public double setVar(float f) {x = f;}

Solutions: