Answer / hardik viradiya

import java.awt.event.*;
import javax.swing.*;
import java.awt.Graphics;
import java.awt.*;
public class MatrixMulFrame extends Frame
{
public static void main(String[] args)
{
MatrixMulFrame fm = new MatrixMulFrame();
fm.setSize(900, 600);
fm.setVisible(true);
fm.repaint();
}
public MatrixMulFrame()
{
}
public void paint(Graphics g)
{
for(int i=1;i<=10;i++)
{
for(int j=1;j<=10;j++)
{
String str = Integer.toString(i*j);
g.drawString(str,(i*30),10+(j*30));
}
}
}
}

Is there any static classes are in java give some examples

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Why we r using String args[] in main() even though v r not passing any arguments in command line?

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does anyone know the code to display a triangle using a applet?

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write a program that inputs two real numbers then exchanges their values.

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I am trying to pass the string firstName from a Servlet called SampleServet. I am running this on eclipse and it tells me that "the value for annotation attribute must be a constant expression. I don't understand why it is giving me this error. @PersonAnnotation(name = SampleServlet.firstName) public class AnnotationClass{

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is public static void main() work in java?is "String arg[]" needed as argument?

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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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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: &#9632; 4 for Visa cards &#9632; 5 for Master cards &#9632; 37 for American Express cards &#9632; 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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write a java program to create a Frame with three scrolls, change the back ground color of the frame using functions with values of scrolls.

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we compile any program bu c:/>javac prog.java and run as c:/>java prog Here what's the meaning of c in javac. We have java Interpreter but not compiler.Then why we have to use javac. Please answer this question?

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