The concept of multiple inheritance is implemented in Java by
extending two or more classes
extending one class and implementing one or more interfaces
all the above
Correct Answer :
B. extending one class and implementing one or more interfaces
Related Questions
putValue(...) method takes _____________________-
Two arguments of object type
First one is of a character type and second one is of an object type
First one is of an object type and second one is of a character type
None of the above.
Servlet can have ___________
get method and post method
get method or post method
Either of the above
A package is a collection of
classes
interface
editing tools
classes and interfaces
Objects are passed to a method by use of call-by-reference.
True
False
Any method in a supper class can be over ridden in its subclass.
True
False
The name of the RMI compiler is ___________
rmicom
rmic
jrmi
none of the above
Which of the following statements are valid array declarations?
int number();
float average[];
double[] marks;
counter int[];
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
When the string objects are compared with ==, the result is true If the strings contain the same values.
True
False
In RMI we invoke client method from remote server
True
False
A variable declared inside the for loop control can not be referenced out side the loop.
True
False
We can add more than one class(es) at the time of compilation Java Beans.
True.
False.
Declaring a method synchronized guarantees that the deadlock cannot occur.
True
False
A constructor must always invoke its supper class constructor in its first statement.
True
False
A JSP file can be stored_________________
With the extension .jsp in servlets folder of the jws
With the extension .html in public_html folder of the jws
With the extension .jsp in public_html folder of the jws
None of the above.
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
It is perfectly legal to assign a subclass object to a supper class reference.
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
To delete a file, we can use an instance of class file.
True
False
With javadoc, which of the following denotes a javadoc comment?
//#
/*
/**
//**
In RMI before running the client program we must start RMI Registry.
True.
False.
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.
One the features of is that an array can store many different types of values.
True
False
Consider the following class definition.
Class Student extends String
{
}
What happens when we try to compile this class?
Will not compile because class body is not defined
Will not compile because class is not declared public
Will compile successfully.
Will not compile because String is abstract
The modulus operator (%) can be used only with Integer operands.
True
False
Which of the following will produce a value of 22 if x=22.9:
Ceil(x)
Round(x)
Rint(x)
Abs(x)
Two methods cannot have the same name in Java.
True
False
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
Declarations can appear anywhere in the body of a Java method.
True
False
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