scjp Questions
8
Solved
One of the correct answers from OCP Java SE 6 Programmer Practice Exams is:
You can programmatically test wheather assertions have been enabled
without throwing an AssertionError.
How can I ...
2
Solved
In studying for the Java certification test I learned that static initialization blocks run once when the class is loaded, in order of appearance within the source code, that instance initializatio...
Supplejack asked 16/12, 2013 at 20:9
10
Solved
I was just studying OCPJP questions and I found this strange code:
public static void main(String a[]) {
System.out.println(Double.NaN==Double.NaN);
System.out.println(Double.NaN!=Double.NaN);
}...
Jonas asked 11/1, 2012 at 13:2
7
Solved
Why in Java can we catch an Exception even if it is not thrown, but we can't catch it's subclass (except for "unchecked" RuntimeExceptions and it subclasses). Example code:
class Test {
public st...
3
Solved
public class Java{
public static void main(String[] args){
final byte x = 1;
final byte y = 2;
byte z = x + y;//ok
System.out.println(z);
byte a = 1;
byte b = 2;
byte c = a + b; //Compiler...
Majewski asked 27/10, 2012 at 12:3
2
Solved
Select the three correct answers (valid declarations).
(a) char a = '\u0061';
(b) char 'a' = 'a';
(c) char \u0061 = 'a';
(d) ch\u0061r a = 'a';
(e) ch'a'r a = 'a';
Answer: (a), (c) and (d)
B...
Portwin asked 8/10, 2019 at 8:54
4
Solved
Can someone explain this code?
public class SneakyThrow {
public static void sneakyThrow(Throwable ex) {
SneakyThrow.<RuntimeException>sneakyThrowInner(ex);
}
private static <T ext...
6
Solved
I've just read through the chapter on method-local inner classes in the SCJP book, and I'm really struggling to think of any practical use for them.
I've always been under the impression, that met...
Springy asked 4/4, 2011 at 19:39
6
I'm preparing for the SCJP (recently rebranded as OCPJP by Oracle) and one particular question that I got wrong on a mock exam has confused me, the answer description doesn't explain things clear e...
Bedstead asked 25/9, 2012 at 18:50
3
Solved
I am currently studying for the SCJP certification using the Sierra and Bates Study Guide and in many of the self tests (mock exam questions) I keep running into the same problem - I can't tell whe...
Sainted asked 5/7, 2010 at 12:40
4
Solved
How come the elements of priority queue are ordered according to natural order by default as it doesn't implement comparable interface?
From the documentation, it says elements are ordered based on...
7
Solved
I am reading for SCJP and I have a question regarding this line:
Identifiers must start with a letter, a currency character ($), or a
connecting character such as the underscore ( _ ). Identifi...
Ascetic asked 2/8, 2012 at 8:54
4
Solved
Just when I thought I finally understood generics, I came across the following example:
public class Organic<E> {
void react(E e) { }
static void main(String[] args) {
//1: Organic<? ...
Owen asked 30/10, 2012 at 6:22
5
Solved
This question was taken from Kathy Sierra SCJP 1.6. How many objects are eligible for garbage collections?
According to Kathy Sierra's answer, it is C. That means two objects are eligible for garb...
5
Solved
I read in the book for OCJP for Java6 the part with assertions. I reached the part where it gives me an overview of how the compiler reacts if the word 'assert' is used as keyword or as an identifi...
7
In Which Cases it is a good coding practice to use implements serializable other than Writing & Reading object to/from file.In a project i went through code. A class using implements serializab...
Anglicism asked 20/7, 2015 at 18:51
4
Solved
I am working on Java Se 7 OCA and could not figure out why below code does not compile. aMethod call in main method gives compile error stating ambiguous method. Precedence rules between widening a...
Dimorph asked 19/3, 2013 at 6:57
3
Solved
I have been testing the char casting and I went through this:
public class Test {
public static void main(String a[]) {
final byte b1 = 1;
byte b2 = 1;
char c = 2;
c = b1; // 1- Working fine...
3
Solved
I have been trying a mock ocjp 6 test. I went though a question asking if the constructor is correct :
1- public Test8(){}
2- private void Test8(){}
3- protected Test8(int k){}
4- Test8(){}
...
Anthropomorphous asked 19/5, 2015 at 14:16
2
Solved
From page 291 of OCP Java SE 6 Programmer Practice Exams, question 25:
public class Stone implements Runnable {
static int id = 1;
public void run() {
id = 1 - id;
if (id == 0)
pick();
el...
Cargo asked 23/11, 2014 at 12:56
3
Solved
Please take a look at below example i cant understand the relation between char and byte
byte b = 1;
char c = 2;
c = b; // line 1
Give me compilation Error because c is type of char and b is ty...
1
Solved
According to the SCJP6 (Page 507) i found that instance variables are assigned default values before the superclass constructors complete, i tried an example in Debugg mode but i saw that the super...
Wheeze asked 24/10, 2014 at 17:4
1
Solved
int primitivI[] = {1,1,1};
Integer wrapperI[] = {2,22,2};
1. System.out.println(primitivI instanceof Object);//true
2. System.out.println(primitivI instanceof Object[]);//Compilation Error Why ??...
Pahlavi asked 10/10, 2014 at 5:24
4
Solved
Why is the output in this example 1?
public static void main(String[] args){
int[] a = { 1, 2, 3, 4 };
int[] b = { 2, 3, 1, 0 };
System.out.println( a [ (a = b)[3] ] );
}
I thought it wou...
1
Solved
I have studied some books for OCPJP 7 certification and in the inner classes chapter there were some strange/incomplete informations. I've tried to create an interface inside a method, but it seems...
1 Next >
© 2022 - 2024 — McMap. All rights reserved.