When we invoke repaint () for a Component, the AWT invokes the method:
draw()
update()
show()
paint()
Correct Answer :
B. update()
Related Questions
Servlet has ___________
init method
doGet(------) method
All of the above methods.
In the code below, what data types the variable x can have?
byte b1 = 5;
byte b2 = 10;
x = b1 * b2;
int short
A Java monitor must either extend thread class or implement Runnable interface.
True
False
Java is fully object oriented programme.
true
false
When we invoke repaint () for a Component, the AWT invokes the method:
draw()
update()
show()
paint()
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.
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.
What is wrong in the following class definitions?
abstract class print {
abstract show();
}
class Display extends print {
}
abstract show();
}
class Display extends print {
}
Nothing is wrong
Wrong Method show() should have a return type
Wrong Methods show() is not implemented in Display
Wrong Display does not contain any members.
Which exception is thrown by the read() method of InputStream class?
IOException
FileNotFoundException
ReadException
None of the above
In evaluating a logical expression of type 'Boolean expression 1&& Boolean expression 2', both the Boolean expressions are not always evaluated.
True
False
Session bean
Represents a single client inside the application server
Can not be shared
Is not persistent
Satisfies all of the above conditions
Connection, Statement are interfaces and ResultSet is a class.
True.
False.
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
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
A variable declared inside the for loop control can not be referenced out side the loop.
True
False
All the bitwise operators have the same level of precedence in Java.
True
False
Every call to wait has a corresponding call to notify that will eventually end the wafting.
True
False
A final class may not have any abstract method.
True
False
Which of the following are not keywords?
NULL
Implements
Protected
None of the above
Which of the following represent legal flow control statements?
break;
break();
continue(inner);
all of the above
Any method in a supper class can be over ridden in its subclass.
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");
Which of the following control expressions are valid for an if statement?
an integer expression
a Boolean expression
either A or B
Neither A or B
The expression (x == y && a<b) is true If either x == y is true or a<b is true.
True
False
The length of a string object 's1' can be obtained using the expression s1.length.
True
False
Which of the following classes are available in the java.lang package?
Random
Stack
String Buffer
Vector
Throwing an exception always causes program termination.
True
False
Which of the following will produce a value of 10 if x = 9.7?
floor(x)
abs(x)
rint(x)
round(x)
In RMI before running the client program we must start RMI Registry.
True.
False.
The import statement is always the first no comment statement in a Java program files.
True
False