All methods in an abstract class must be declared abstract.
True
False
Correct Answer :
B. False
Related Questions
The break statement is required in the default case of a switch selection structure.
True
False
When present, package must be the first no comment statement in the file.
True
False
The length of a string object 's1' can be obtained using the expression s1.length.
True
False
If a=10 and b= 15, then the statement x =(a>b)?a:b; assigns the value 15 to x.
True
False
A Java monitor must either extend thread class or implement Runnable interface.
True
False
What does the following line of code do?
TextField text=new TextField(10);
Creates text object that can hold 10 rows of text.
Creates text object that can hold 10 columns of text.
Creates the object text and initializes it with the value 10.
The code is illegal.
EJBs can be of the following type(s)
None of the above
Entity Bean
Session Bean
Message-driven bean
All of the above
If you want to assign a value of 99 to the variable year, then which of the following lines can be used within an <applet> tags?
number=getParameter(99)
<number==99>
<param = radius value ==99>
Any method in a supper class can be over ridden in its subclass.
True
False
Which of the following methods can be used to remove a component from the display?
remove()
desappear()
hide()
move()
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
What is error in the following class definitions?
abstract class xy {
abstract sum(int x, int y) {
}
}
abstract sum(int x, int y) {
}
}
class header is not define properly
constructor is no defined
method is not defined properly
no error
Which of the following represent legal flow control statements?
break();
continue(inner);
return;
exit();
Every method of a final in class is implicitly final.
True
False
One the features of is that an array can store many different types of values.
True
False
forName() is a static factory method
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");
Servlet has ___________
init method
doGet(------) method
All of the above methods.
For all insert, update, delete, query operations on a database, ResultSet object creation is mandatory.
True.
False.
Members of a class specified as private are accessible only to the methods of the class.
True
False
A static class method can be invoked by simply using the name of the method alone.
True
False
The setBackground() method is part of the class
Applet
Component
Container
Object
We can over load methods with differences only in their return type.
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
A thread can make second thread ineligible for execution by calling the suspend (-) method on second thread.
True
False
Which exception is thrown by the read() method of InputStream class?
IOException
FileNotFoundException
ReadException
None of the above
Java is fully object oriented programme.
true
false
The programmer must explicitly create the system .in and system .out objects.
True
False
JSP files creates ________________
html files
html files and java files
java files and class files
None of the above.
DriverManager.getConnection("jdbc:odbc:dsn_name") method does not depend on the class.forName(...) method.
True.
False.