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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)...

Main method in Java

What is main method in Java?
          Main method in Java is an standard method which is used by JVM to start execution of any java program. Main method is referred as entry point of any standalone java application.
          Main method in Java is public so that it's visible to every other class, even which are not part of it's package. If it is not public, JVM class might not able to access it.
          Main method is static so that java runtime can access it without initializing the class. While JVM tried to execute java program, it doesn't know how to create instance of main class as there is no standard constructor is defined for main class.
          Main method is void in Java because it doesn't return anything to caller which is JVM.

Signature of main method:
          main method is public, static and void and accept an array of String as argument through which we can pass runtime arguments to the java program. From java5 onwards it can also accept variable arguments instead of array. Following signature are valid main method signature in java :
public static void main(String args[]) {}
public static void main (String [] args) {}
public static void main (String.... args) {}
          You can also use certain modifier like final, synchronized and strictfp along with main method in java.
          If you change the signature of main method, JVM will not able to locate main method and will throw exception at runtime as:
'java.lang.NoSuchMethodError:main'
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