The name of a Java program file must match the name of the class with the extension Java.
True
False
Correct Answer :
A. True
Related Questions
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
To delete a file, we can use an instance of class file.
True
False
forName() is a static factory method
True
False
If a=10 and b= 15, then the statement x =(a>b)?a:b; assigns the value 15 to x.
True
False
It is an error to have a method with the same signature in both the super class and its subclass.
True
False
The check box group class is a subclass of the component class.
True
False
Submit button always fires doPost(...)
True
False
Which of the following will produce a value of 10 if x = 9.7?
floor(x)
abs(x)
rint(x)
round(x)
A method declared as static can not access non-static class members.
True
False
In order to connect to a database through java program we must create _______-
Connection, Statement, ResultSet
Connection, ResultSet
Statement< ResultSet
Connection, Statement
In a single Servlet class we can use____________
doGet(...) method only
doPost(...) method only
doGet(...) method and doPost(...) method both at a time.
Either 'a' or 'b'
Which of the following represent legal flow control statements?
break();
continue(inner);
return;
exit();
A catch can have comma-separated multiple arguments.
True
False
Which of the following are not keywords?
NULL
Implements
Protected
None of the above
Which of the following will produce a value of 22 if x=22.9:
Ceil(x)
Round(x)
Rint(x)
Abs(x)
Which of the following methods can be used to remove a component from the display?
remove()
desappear()
hide()
move()
Which of the following command lines options generates documentation for all classes and methods?
-protected
-public
-private
-encoding
Give file is a file object, which of the following are legal statements to create a new file.
file.create();
FileOutputStream fos=new FileOutputStream(file);
FileInputStream fis=new FileInputStream(file);
all of the above
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 statements are valid array declarations?
int number();
float average[];
double[] marks;
counter int[];
It is perfectly legal to assign a subclass object to a supper class reference.
True
False
When we implement an interface method, it should be declared as public.
True
False
Which exception is thrown by the read() method of InputStream class?
IOException
FileNotFoundException
ReadException
None of the above
When present, package must be the first no comment statement in the file.
True
False
A class may be both abstract and final.
True
False
Which of the following are the wrapper classes?
Random
Vector
Byte
all of the above
An EJB is a server-side component that encapsulates the business logic of an application
True
False
Every method of a final in class is implicitly final.
True
False
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.
Declaring a method synchronized guarantees that the deadlock cannot occur.
True
False