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Section 4 : Language Fundamentals

 

 


 

State the correspondence between index values in the argument array passed to a main method and command line arguments. Identify all Java Programming Language keywords and correctly constructed identifiers.

 


 

Command line arguments and the main () method :

 

Whatever arguments are passed as command line arguments while executing a Java program are placed in the String [] array parameter of the main method. When there are no arguments, the String array is an empty array. If you pass a single argument, it is placed at the array index 0. So, args[0] corresponds to this argument. Thus the number of arguments becomes the length of the array and the arguments are accessed in the program in the usual way of accessing elements of an array.

 

Java keywords :

 

 

abstract

double

int

strictfp

boolean

else

interface

super

break

extends

long

switch

byte

final

native

synchronized

case

finally

new

this

catch

float

package

throw

char

for

private

throws

class

goto

protected

transient

const

if

public

try

continue

implements

return

void

default

import

short

volatile

do

instanceOf

static

while

 

Apart from these 48 keywords, there are three more words : null, true and false. Many authors list these words as keywords too. But, Java Language Specification says that these are not keywords but literals.

 


 

section4-1 | section4-2 | section4-3 | section4-4

 

Sections : 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11

 

 

 

 

 

 

 

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