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Oracle 1Z0-501 Exam Syllabus Topics:

Oracle Java Certified Programmer Sample Questions:

1. Which statement is true for the class java.util.ArrayList?

A) The collection is guaranteed to be immutable.
B) The elements in the collection are ordered.
C) The elements in the collection are accessed using a unique key.
D) The elements in the collections are guaranteed to be synchronized.
E) The elements in the collection are guaranteed to be unique.

2. Given:
1 . public class Foo {
2 . public void main (String [] args){
3 .system.out.printIn("Hello World.");
4 .}
5 .}
What is the result?

A) The code does no compile.
B) An exception is thrown.
C) The program exits without printing anything.
D) "Hello World." Is printed to the terminal.

3. Given:
1 . public class X {
2 . public object m () {
3 . object o = new float (3.14F);
4 . object [] oa = new object [1];
5 . oa[0]= o;
6 . o = null;
7 . oa[0] = null;
9 . return o;
9 . }
1 0.}
When is the float object created in line 3, eligible for garbage collection?

A) Just after line 5.
B) Just after line 6.
C) Just after line 8(that is, as the method returns).
D) Just after line 7.

4. Exhibit:
ClassOne.java
1. package com.abc.pkg1;
2. public class ClassOne {
3. private char var = 'a';
4. char getVar() {return var;}
5. } ClassTest.java
1 . package com.abc.pkg2;
2 . import com.abc.pkg1.ClassOne;
3 . public class ClassTest extends ClassOne {
4 . public static void main(String[]args){
5 .char a = new ClassOne().getVar();
6 .char b = new ClassTest().getVar();
7 .}
8 . }
What is the result?

A) Compilation succeeds and no exceptions are thrown.
B) Compilation succeeds but an exception is thrown at line 6 in ClassTest.java.
C) Compilation will fail.
D) Compilation succeeds but an exception is thrown at line 5 in ClassTest.java.

5. Which two statements are true regarding the creation of a default constructor? (Choose Two)

A) The default constructor invokes the no-parameter constructor of the superclass.
B) If a class lacks a no-parameter constructor,, but has other constructors, the compiler creates a default constructor.
C) The default constructor initializes the instance variables declared in the class.
D) The default constructor initializes method variables.
E) The compiler creates a default constructor only when there are no other constructors for the class.

Solutions: