A Java monitor must either extend thread class or implement Runnable interface.
True
False
Correct Answer :
B. False
Related Questions
When the string objects are compared with ==, the result is true If the strings contain the same values.
True
False
When we implement an interface method, it should be declared as public.
True
False
We would like to make a member of a class visible in all subclasses regardless of what package they are in. Which one of the following keywords would achieve this?
private
protected
public
private protected
The default case is always required in the switch selection structure.
True
False
Servlet has ___________
init method
doGet(------) method
All of the above methods.
Which of the following represent legal flow control statements?
break();
continue(inner);
return;
exit();
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.
Declarations can appear anywhere in the body of a Java method.
True
False
The modulus operator (%) can be used only with Integer operands.
True
False
Java is fully object oriented programme.
true
false
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
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.
Which of the following classes are available in the java.lang package?
Random
Stack
String Buffer
Vector
A thread can make second thread ineligible for execution by calling the suspend (-) method on second thread.
True
False
With javadoc, which of the following denotes a javadoc comment?
//#
/*
/**
//**
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
Objects are passed to a method by use of call-by-reference.
True
False
Which of the following methods can be used to draw the outline of a square?
fillRect()
drawLine()
drawString()
all of the above
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 will produce a value of 10 if x = 9.7?
floor(x)
abs(x)
rint(x)
round(x)
All the bitwise operators have the same level of precedence in Java.
True
False
Which exception is thrown by the read() method of InputStream class?
IOException
FileNotFoundException
ReadException
None of the above
A catch can have comma-separated multiple arguments.
True
False
An individual array element that is passed to a method and modified in that method will contain the modified value when the called method completes execution.
True
False
For all insert, update, delete, query operations on a database, ResultSet object creation is mandatory.
True.
False.
Every call to wait has a corresponding call to notify that will eventually end the wafting.
True
False
The setBackground() method is part of the class
Applet
Component
Container
Object
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
Connection, Statement are interfaces and ResultSet is a class.
True.
False.