Which of the following are the wrapper classes?
Random
Vector
Byte
all of the above
Correct Answer :
C. Byte
Related Questions
The use of protected keyword to a member in a class will restrict its visibility as follows:
Visibility only in the class and its subclasses in the same package.
Visibility only inside the same package.
Visibility in all classes in the same package and subclasses in other packages.
Visibility only in the class where it is declared.
A constructor must always invoke its supper class constructor in its first statement.
True
False
A final class may not have any abstract method.
True
False
Which of the following methods can be used to draw the outline of a square?
fillRect()
drawLine()
drawString()
all of the above
Consider the following class definitions:
class maths {
student student1;
}
class student {
String name;
}
student student1;
}
class student {
String name;
}
This code represents:
an 'is a' relationship
a 'has a' relationship
both
neither
DriverManager.getConnection("jdbc:odbc:dsn_name") method does not depend on the class.forName(...) method.
True.
False.
The name of the RMI compiler is ___________
rmicom
rmic
jrmi
none of the above
If a=10 and b= 15, then the statement x =(a>b)?a:b; assigns the value 15 to x.
True
False
Consider the following statements:
int x = 10, y = 15;
x = ((x < y) ? (y + x) : (y - x);
What will be the value of x after executing these statements?
x = ((x < y) ? (y + x) : (y - x);
25
15
5
Error can't be executed.
The name of a Java program file must match the name of the class with the extension Java.
True
False
It is perfectly legal to assign a subclass object to a supper class reference.
True
False
Every method of a final in class is implicitly final.
True
False
In RMI before running the client program we must start RMI Registry.
True.
False.
Which of the following represent legal flow control statements?
break;
break();
continue(inner);
all of the above
Session bean
Represents a single client inside the application server
Can not be shared
Is not persistent
Satisfies all of the above conditions
The import statement is always the first no comment statement in a Java program files.
True
False
Which of the following keywords are used to control access to a class member?
default
protected
interface
None of the above
Which exception is thrown by the read() method of InputStream class?
IOException
FileNotFoundException
ReadException
None of the above
For all insert, update, delete, query operations on a database, ResultSet object creation is mandatory.
True.
False.
Which of the following command lines options generates documentation for all classes and methods?
-protected
-public
-private
-encoding
Which key word can protect a class in package from accessibility by the classes outside the package?
private
protected
final
don't use any keyword at all(make it default)
Every call to wait has a corresponding call to notify that will eventually end the wafting.
True
False
executeUpdate(------------) returns ___________
Nothing
Returns a ResultSet object
Returns an integer value to show the no. of updated rows
None of the above.
JdbcOdbcDriver is an object of Object class
True
False
To delete a file, we can use an instance of class file.
True
False
When X is a positive number the operations x>> 2 and x>>>2 both produce the same result.
True
False
JSP files creates ________________
html files
html files and java files
java files and class files
None of the above.
Given the code
String s = new String("abc");
Which of the following calls are valid?
s.toUpperCase()
s.append("xyz")
s.setCharAt(1<'A')
all of the above
Consider the following code snippet:
try
{
int x=0; int y=50/x;
System.out.println("Division by zero");
}
catch(ArithmeticException e)
{
System.out.println("catch block");
}
What will be the output?
{
int x=0; int y=50/x;
System.out.println("Division by zero");
}
catch(ArithmeticException e)
{
System.out.println("catch block");
}
Error. Won't compile
Division by zero
Catch block
Division by zero catch block
A class may be both abstract and final.
True
False