Computing Magazine

Java Declaration and Access Control- Quiz 0.2

Posted on the 17 April 2012 by In7rud3r
<a href="http://www.yesadvertising.com">affiliate marketing</a>Which one of these is a valid method declaration? Select the one correct answer.
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void method1 { /* ... */ }
void method2() { /* ... */ }
void method3(void) { /* ... */ }
method4() { /* ... */ }
method5(void) { /* ... */ }
Given a class named Book, which one of these is a valid constructor declaration for the class? Select the one correct answer.
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Book(Book b) {}
Book Book() {}
private final Book() {}
void Book() {}
public static void Book(String[] args) {}
abstract Book() {}
What will be the result of attempting to compile the following program?
public class MyClass {
long var;
public void MyClass(long param) { var = param; } // (1)
public static void main(String[] args) {
MyClass a, b;
a = new MyClass(); // (2)
b = new MyClass(5); // (3)
}
}
Select the one correct answer.
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A compilation error will occur at (1), since constructors cannot specify a return value.
A compilation error will occur at (2), since the class does not have a default constructor.
A compilation error will occur at (3), since the class does not have a constructor which takes one argument of type int.
The program will compile correctly.
Which one of the following class definitions is a valid definition of a class that cannot be instantiated? Select the one correct answer.
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class Ghost { abstract void haunt(); }
abstract class Ghost { void haunt(); }
abstract class Ghost { void haunt() {}; }
abstract Ghost { abstract void haunt(); }
static class Ghost { abstract haunt(); }
Which one of the following class definitions is a valid definition of a class that cannot be extended? Select the one correct answer.
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class Link { }
abstract class Link { }
native class Link { }
static class Link { }
final class Link { }
private class Link { }
abstract final class Link { }
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