Oracle 1Z0-501 : Java Certified Programmer

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Oracle Java Certified Programmer Sample Questions:

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

2. What is the numerical range of a char?

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

3. Given:
1. public class OuterClass {
2. private double d1 1.0;
3. //insert code here
4. }
You need to insert an inner class declaration at line2. Which two inner class declarations are valid? (Choose Two)

A) static class InnerOne {
static double methoda() {return d1;}
}
B) static class InnerOne {
public double methoda() {return d1;}
}
C) protected class InnerOne {
static double methoda() {return d1;}
}
D) public abstract class InnerOne {
public abstract double methoda();
}
E) private class InnerOne {
public double methoda() {return d1;}
}

4. The file "file.txt" exists on the file system and contsins ASCII text.
Given:
3 8. try {
3 9. File f = new File("file.txt");
4 0. OutputStream out = new FileOutputStream(f, true);
4 1. }
4 2. catch (IOException){}
What is the result?

A) An exception is thrown because the file is not closed.
B) The code runs and no change is made to the file.
C) The code does not compile.
D) The code runs and deletes the file from the file system.
E) The code runs and sets the length of the file to 0.

5. Given:
Integer i = new Integer (42);
Long 1 = new Long (42);
Double d = new Double (42.0);
Which two expressions evaluate to True? (Choose Two)

A) (i.equals (42))
B) (i == d)
C) (d.equals (i))
D) (i.equals (d))
E) (d == 1)
F) (i ==1)

Solutions: