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System Class
What is the use of system class?
Thomas John
- Sep 22nd, 2015
The purpose of the System class is to provide access to system resources. It contains accessibility to standard input, standard output, error output streams, current time in milliseconds, terminating the application, etc.
zero10
- Jan 26th, 2010
Well it depends upon you for what purpose do use system class.Say, System.in >> belongs to inputstream interface helps in inputting from the console.whereas, System.out and System.err is used to...
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The new operator dynamically allocates ________ for an object and returns a reference to it.
A) ClassesB) VariablesC) Memory D) None of the Above
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Method overloading is one of the ways that Java supports ____________
A) EncapsulationB) ClassC) InheritenceD) Polymorphism
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Can a abstract class have a constructor ?When would the constructor in the abstract class be called ?
All the classes including the abstract classes can have constructors.Abstract class constructors will be called when its concrete subclass will be instantiated.
Amms
- Sep 30th, 2011
Abstract class constructor can be called from the subclass that is extending this abstract class. You would define a constructor in an abstract class if you are in one of these situations: you wa...
navneetgoyal2000
- Jan 6th, 2011
Yes, Abstract Class can have Constructor, infact I would say it SHOULD have constructor.As ABS class is not a class WITH NO FUNCTIONALITY, it always can HAVE some common functionality.Please understan...
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Regarding to strings
class String{
public static void main(String args[]){
}
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The Code in java is contained within Methods
A) TrueB) False
keyvez
- Mar 19th, 2008
Code in Java can also be in instance initializer blocks and static and non-static blocks. So the answer to this question is false.
sukace
- Nov 20th, 2007
Code in java can also be in blocks(Static and non-static) which are not the part of the methods. So, the answer should be false not true.
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When we create a class, we are creating a new data type
A) TrueB) False
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What is the output of the following? // A simple example of recursion.class Factorial { // this is a recursive method int fact(int n) { int result; if(n==1) return 1; result = fact(n-1) * n; return result; }} class Recursion { public static void main(String args[]) { Factorial f = new Factorial(); System.out.println("Factorial of 3 is " + f.fact(3)); }}
A) Factorial of 3 is 3B) Factorial of 3 is 6C) Factorial of 3 is 9D) None of the above
r.praveenkumar
- Feb 26th, 2009
Ans is (d) None of the aboveBecause we are not defining else part of the if statement.Unreachable code error because of the absence of else part.
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A class is declared by use of the ________ keyword.
A) ObjectB) ClassC) Instance D) None of the above
sneh lata
- Sep 15th, 2007
A class is declared with "class" keyword not "Class" keyword.Class is a predefined class which is used to load other classes.
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Java does not supports recursion
A) TrueB) False
nidhi
- Oct 14th, 2011
Java supports recursion
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It is possible to define a class within another class; such classes are known as ____________
A) Nested Classes
sukace
- Nov 20th, 2007
I think this mode of answering the question when you have to enter the text should not be used. one thing can be named in many ways, and you cant say that which is correct.I answered Inner classes and it says its wrong.
pandiyarajanm
- Apr 9th, 2007
A class is defined inside the another class(ie) innwerc class.Nested class is a class of class.
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What is meant by Pre-emptive scheduling?
Thomas John
- Sep 22nd, 2015
Tasks are usually assigned with priorities. At times it is necessary to run a certain task that has a higher priority before another task although it is running. Therefore, the running task is interru...
jawaharl0207
- Oct 26th, 2009
Fixed priority pre-emptive scheduling is a scheduling system commonly used in real-time systems. With fixed priority pre-emptive scheduling, the scheduler ensures that at any given time, the processor executes the highest priority task of all those tasks that are currently ready to execute.
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In interfaces the methods just defined without implementation then what is the purpose of defining the methods?
Thomas John
- Sep 22nd, 2015
Interfaces is run time polymorphism. A class can extend one class and implement an interface. Another class can implement the same interface yet come from a different inheritance tree. So you treat an...
Deepak agnihotri
- Nov 26th, 2010
An Interface force the end user to implement all the methods declared in the interface, in this way it is ensured that all the extending classes of a particular interface are ...
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In this example class-var = new classname( ); class-var is a variable of the class type being created
A) TrueB) False
mala gopathi
- Jan 6th, 2022
True
tarun_1984
- Jun 19th, 2009
In this Question in the given example class-var is nothing but an object of class classname
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The data, or variables, defined within a class are called _______ variables
A) ObjectB) ClassC) Instance D) None of the above
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Java Classes Questions
Ans