Which of the following statements are true?
An abstract class may not have any final methods?
A final class may not have any abstracts methods.
Transient variables must be static.
all of the above
Correct Answer :
B. A final class may not have any abstracts methods.
Related Questions
All the bitwise operators have the same level of precedence in Java.
True
False
Java is fully object oriented programme.
true
false
executeUpdate(------------) returns ___________
Nothing
Returns a ResultSet object
Returns an integer value to show the no. of updated rows
None of the above.
Which of the following methods can be used to remove a component from the display?
remove()
desappear()
hide()
move()
Which of the following statements are true?
UTF characters are all 24 bits.
Reader class has methods that can read integers and floats.
Unicode characters are all 16 bits.
all of the above
Every method of a final in class is implicitly final.
True
False
When X is a positive number the operations x>> 2 and x>>>2 both produce the same result.
True
False
Which of the following are not keywords?
NULL
Implements
Protected
None of the above
The setBackground() method is part of the class
Applet
Component
Container
Object
Which of the following classes are available in the java.lang package?
Random
Stack
String Buffer
Vector
If m and n are int type variables, what will be the result of the expression
'm % n' when m = -14 and n = -3?
4
2
-2
-4
An EJB is a server-side component that encapsulates the business logic of an application
True
False
Which are the valid ways to create DataInputStream streams?
new DataInputStream(new File("in.dat"));
new DataInputStream(new FileInputStream("in.dat"));
new DataInputStream("in.dat");
new DataInputStream("in.data","r");
Message-Driven beans act as a listener for the Java Message Service API, processing messages synchronously
True
False
A method declared as static can not access non-static class members.
True
False
In evaluating a logical expression of type 'Boolean expression 1&& Boolean expression 2', both the Boolean expressions are not always evaluated.
True
False
Frames and applets cannot be used together in the same program.
True
False
A final class may not have any abstract method.
True
False
Which of the following methods belong to the String class?
length()
compareTo()
substring()
all of the them
executeUpdate automatically updates data because___________
auto commit is on, by default
It performs a hidden commit statement as well
Does not commit
None 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
We can over load methods with differences only in their return type.
True
False
Which of the following are keywords?
integer
default
Boolean
Object
A catch can have comma-separated multiple arguments.
True
False
Submit button always fires doPost(...)
True
False
A Java monitor must either extend thread class or implement Runnable interface.
True
False
The length of a string object 's1' can be obtained using the expression s1.length.
True
False
A static class method can be invoked by simply using the name of the method alone.
True
False
Which of the following will produce a value of 10 if x = 9.7?
floor(x)
abs(x)
rint(x)
round(x)
Java always provides a default constructor to a class.
True
False