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Quiz based on Digital Principles and Computer Organization

1) Base of hexadecimal number system? Answer : 16 2) Universal gate in digital logic? Answer : NAND 3) Memory type that is non-volatile? Answer : ROM 4) Basic building block of digital circuits? Answer : Gate 5) Device used for data storage in sequential circuits? Answer : Flip-flop 6) Architecture with shared memory for instructions and data? Answer : von Neumann 7) The smallest unit of data in computing? Answer : Bit 8) Unit that performs arithmetic operations in a CPU? Answer : ALU 9) Memory faster than main memory but smaller in size? Answer : Cache 10) System cycle that includes fetch, decode, and execute? Answer : Instruction 11) Type of circuit where output depends on present input only? Answer : Combinational 12) The binary equivalent of decimal 10? Answer : 1010 13) Memory used for high-speed temporary storage in a CPU? Answer : Register 14) Method of representing negative numbers in binary? Answer : Two's complement 15) Gate that inverts its input signal? Answer : NOT 16)...

Java important Question - 5

Q) What are wrapper classes? Why do we need wrapper classes ?
Answer :
          Wrapper class provides the mechanism to convert primitive into object and object into primitive. In the java.lang package java provides a separate class for each of the primitive data types namely Boolean, Byte, Short, Integer, Float, Long, Double & Character. These are known as wrapper classes because they wrap the primitive data type into an object of the class.

Need of wrapper classes :
* They convert primitive data types into objects. Objects are needed if we wish to modify the arguments passed into a method.
* The classes in java.util package handles only objects and hence wrapper classes help in this case also.
* Data structures in the collection framework, such as ArrayList and vector, store only objects and not primitive types.
* An object is needed to support synchronization in multithreading.


Q) What is an interface ?
Answer :
          An interface is a reference type in Java. It is similar to class. It is a blueprint of a class. Interfaces specify what a class must do not how.
          An interface can have methods and variables like the class but the methods declared in interface are by default abstract. The class that implements interface must implement all the methods of that interface. Also, the variables declared in an interface are public, static and final by default.
          The interface keyword is used to declare an interface. Following is an example of an interface.

/* File name : NameOfInterface.java */
import java.lang.*;
// Any number of import statement
 
public interface NameOfInterface {
// Any number of final, static fields
// Any number of abstract method declarations
}

Q) What is an abstract class ?
Answer :
          Abstract classes are used in java to create a class with some default method implementation for subclasses. An abstract class can have abstract method without body and it can have methods with implementation also.
          abstract keyword is used to create a abstract class. Abstract classes can't be instantiated are mostly used to provide base for subclasses to extend and implement the abstract methods and override or use the implemented methods in abstract class.
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