Oracle 1Z0-501 : Java Certified Programmer

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Oracle 1Z0-501 Exam Syllabus Topics:

Oracle Java Certified Programmer Sample Questions:

1. CORRECT TEXT
Given:
AnInterface is an interface.
AnAdapter0 is a non-abstract, non-final class with a zero argument constructor.
AnAdapter1 is a non-abstract, non-final class without a zero argument constructor, but with a constructor that takes one int argument.
Which two construct an anonymous inner class? (Choose Two)
F.AnAdapter1 aa=new AnAdapter1(){}
G.AnAdapter0 aa=new AnAdapter0(){}
H.AnAdapter0 aa=new AnAdapter0(5){}
I.AnAdapter1 aa=new AnAdapter1(5){}
J.AnInterface a1=new AnInterface(5){}

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

3. CORRECT TEXT
Exhibit:
1 . Public class test (
2 . Public static void stringReplace (String text)(
3 .Text = text.replace ('j' , 'i');
4 . )
5 .
6 . public static void bufferReplace (StringBuffer text)(
7 .text = text.append ("C")
8 . )
9 .
1 0. public static void main (String args[]} (
1 1.String textString = new String ("java");
1 2.StringBuffer text BufferString = new StringBuffer ("java");
1 3.
1 4.stringReplace (textString);
1 5.BufferReplace (textBuffer);
1 6.
1 7.System.out.printIn (textString + textBuffer);
1 8.}
1 9.)
What is the output?

4. CORRECT TEXT
Exhibit:
1 . public class X {
2 . public static void main (String[]args) {
3 . string s = new string ("Hello");
4 . modify(s);
5 . System.out.printIn(s);
6 .}
7 .
8 . public static void modify (String s){
9 . s += "world!";
1 0.}
1 1. }
What is the result?
E.The program runs and prints "Hello"
F.An error causes compilation to fail.
G.The program runs and prints "Hello world!"
H.The program runs but aborts with an exception.

5. Which two statements are true? (Choose Two)

A) Event if a class Super does not implement any interfaces, it is still possible to define an anonymous inner class that is an immediate subclass of Super that implements multiple interfaces.
B) An anonymous inner class constructor can take arguments in some situation.
C) An anonymous inner class can be declared inside of a method
D) Even if a class Super does not implement any interfaces, it is still possible to define an anonymous inner class that is an immediate subclass of Super that implements a single interface.
E) An anonymous inner class that is a direct subclass that is a direct subclass of Object can implementmultiple interfaces.

Solutions: