is public static void main() work in java?is "String arg[]"
needed as argument?
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Answer / kapil
public static void main() will not work in java.
You have to give argument String arg[]
| Is This Answer Correct ? | 15 Yes | 0 No |
Answer / ghanshyam dobariya
Without specifying "String[] args" it will be compiled...
but will create run time exceptoin...
| Is This Answer Correct ? | 7 Yes | 2 No |
Answer / sravani
each and every main method of java program must take array of objects of string class.Hence writing String args[] as main method arguement is must.
| Is This Answer Correct ? | 3 Yes | 0 No |
Answer / abhishek goray
as overloading is also done implicitly in java...without
writing the whole signature of the function main ..java will
compile it as a user-defined function rather than the main
function it is looking for.
so we have to write the whole signature
public static void main(String[] args)
| Is This Answer Correct ? | 2 Yes | 0 No |
Is there any static classes are in java give some examples
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Financial: credit card number validation) Credit card numbers follow certain patterns. A credit card number must have between 13 and 16 digits. It must start with: ■ 4 for Visa cards ■ 5 for Master cards ■ 37 for American Express cards ■ 6 for Discover cards In 1954, Hans Luhn of IBM proposed an algorithm for validating credit card numbers. The algorithm is useful to determine whether a card number is entered correctly or whether a credit card is scanned correctly by a scanner. All credit card numbers are generated following this validity check, commonly known as the Luhn check or the Mod 10 check, which can be described as follows (for illustration, consider the card number 4388576018402626): 1. Double every second digit from right to left. If doubling of a digit results in a two-digit number, add up the two digits to get a single-digit number. 2 * 2 = 4 2 * 2 = 4 4 * 2 = 8 1 * 2 = 2 6 * 2 = 12 (1 + 2 = 3) 5 * 2 = 10 (1 + 0 = 1) 8 * 2 = 16 (1 + 6 = 7) 4 * 2 = 8 2. Now add all single-digit numbers from Step 1. 4 + 4 + 8 + 2 + 3 + 1 + 7 + 8 = 37 3. Add all digits in the odd places from right to left in the card number. 6 + 6 + 0 + 8 + 0 + 7 + 8 + 3 = 38 4. Sum the results from Step 2 and Step 3. 37 + 38 = 75 5. If the result from Step 4 is divisible by 10, the card number is valid; otherwise, it is invalid. For example, the number 4388576018402626 is invalid, but the number 4388576018410707 is valid. Write a program that prompts the user to enter a credit card number as a long integer. Display whether the number is valid or invalid. Design your program to use the following methods: /** Return true if the card number is valid */ public static boolean isValid(long number) /** Get the result from Step 2 */ public static int sumOfDoubleEvenPlace(long number) /** Return this number if it is a single digit, otherwise, return * the sum of the two digits */ public static int getDigit(int number) /** Return sum of odd place digits in number */ public static int sumOfOddPlace(long number) /** Return true if the digit d is a prefix for number */ public static boolean prefixMatched(long number, int d) /** Return the number of digits in d */ public static int getSize(long d) /** Return the first k number of digits from number. If the * number of digits in number is less than k, return
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Why the program getting error if we don't use String args[] in main(), even in the case of not getting any arguments from command line?
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