Im having error issues with some code I wiritten was looking for help. Code:package chapter.pkg6.part.pkg2.assignment;import java.util.Scanner;/** * * @author matty */public class Chapter6Part2Assignment { /** * @param args the command line arguments */ static long cardnumber= 4440967484181607L; public static void main(String[] args) { // asking for card number System.out.println("please enter the card number:/n"); System.out.println(cardnumber + "is"+ (validitychk(cardnumber)?"valid":"invlaid")); System.out.println(); } public static boolean validitychk(long cnumber) { //return statemnt return (thesize(cardnumber) >= 13 && thesize(cnumber) <= 16) && (prefixmatch(cardnumber, 4) || prefixmatch(cardnumber, 5) || prefixmatch(cnumber, 37) || prefixmatch(cardnumber, 6)) && ((sumdoubleeven(cnumber) + sumodd(cnumber)) % 10 == 0); } public static int thesize(long cardnumber){ String cardnumberString= cardnumber +""; return cardnumberString.length(); } public static boolean prefixmatch(longcardnumber, int num) { return true; } public static int sumdoubleeven(long cardnumber){ int sum = 0; String num = cardnumber + ""; for (int i = thesize(cardnumber) - 2; i >= 0; i -= 2) sum += getDigit(Integer.parseInt(num.charAt(i) + "") * 2); return sum; } public static int getDigit(int carnumber) { if (carnumber<9) return cardnumber; return cardnumber / 10 + cardnumber % 10; } public static int sumodd(long cardnumner){ int sum=0; String num=cardnumber+""; for(int i=thesize(cardnumber)-1;i>=0;i-=2) sum += Integer.parseInt(num.charAt(i)+""); return sum; }} I also attached an image where the issue was thanks! The image contains Java code and an error message output from an Integrated Development Environment (IDE).### Code Explanation:1. **Method: `prefixMatched`** - **Signature:** `public static boolean prefixMatched(long cardnumber, int num)` - **Purpose:** It is designed to check some condition related to the prefix of a given card number. Currently, it always returns `true`.2. **Method: `sumDoubleEven`** - **Signature:** `public static int sumDoubleEven(long cardnumber)` - **Purpose:** Computes the sum of double the even-position digits in the card number. - **Logic:** - Iterates over the card number from the second-to-last digit to the start. - Doubles each even-position digit and adds the results using the `getDigit` method.3. **Method: `getDigit`** - **Signature:** `public static int getDigit(int cardnumber)` - **Purpose:** Returns the individual digit if less than 9; otherwise, splits the digits and returns their sum. - **Logics:** - Checks if `cardnumber` is less than 9, returns it directly. - Otherwise, splits the number and returns the sum of its digits.4. **Method: `sumOdd`** - **Signature:** `public static int sumOdd(long cardnumber)` - **Purpose:** Sums the digits at odd positions in the card number. - **Logic:** - Iterates over the card number from the last digit to the start, adding all odd-position digits.### Error Output:- **Title:** "Output - Chapter 6 part 2 assignment (run)"- **Error:** - A JNI error has occurred. The error type is `NoClassDefFoundError: longcardnumber`. - **Details:** - The error indicates that the class `longcardnumber` cannot be found, suggesting issues in classpath setup or a missing compiled class. - **Trace:** - Several Java classes and methods are referenced in the stack trace, including `java.lang.Class`, methods like `getDeclaredMethods`, `getMethod`, and specifics of `ClassLoader`.### Debugging Suggestions:- Ensure all Java classes are compiled.- Verify CLASSPATH and ensure the necessary classes are included.- Consult IDE setup guides for resolving common JNI and classpath issues.

It is defined as a object-oriented programming, platform-independent, and secure programming…

Code: package chapter.pkg6.part.pkg2.assignment; import java.util.Scanner; /** * * @author matty */ public class Chapter6Part2Assignment { /** * @param args the command line arguments / static long cardnumber= 4440967484181607L; public static void main(String[] args) { // asking for card number System.out.println("please enter the card number:/n"); System.out.println(cardnumber + "is"+ (validitychk(cardnumber)?"valid":"invlaid")); System.out.println(); } public static boolean validitychk(long cnumber) { //return statemnt return (thesize(cardnumber) >= 13 && thesize(cnumber) <= 16) && (prefixmatch(cardnumber, 4) || prefixmatch(cardnumber, 5) || prefixmatch(cnumber, 37) || prefixmatch(cardnumber, 6)) && ((sumdoubleeven(cnumber) + sumodd(cnumber)) % 10 == 0); } public static int thesize(long cardnumber){ String cardnumberString= cardnumber +""; return cardnumberString.length(); } public static boolean prefixmatch(longcardnumber, int num) { return true; } public static int sumdoubleeven(long cardnumber){ int sum = 0; String num = cardnumber + ""; for (int i = thesize(cardnumber) - 2; i >= 0; i -= 2) sum += getDigit(Integer.parseInt(num.charAt(i) + "") 2); return sum; } public static int getDigit(int carnumber) { if (carnumber<9) return cardnumber; return cardnumber / 10 + cardnumber % 10; } public static int sumodd(long cardnumner){ int sum=0; String num=cardnumber+""; for(int i=thesize(cardnumber)-1;i>=0;i-=2) sum += Integer.parseInt(num.charAt(i)+""); return sum; } } I also attached an image where the issue was thanks!

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Im having error issues with some code I wiritten was looking for help.

Code:

package chapter.pkg6.part.pkg2.assignment;
import java.util.Scanner;
/**
*
* @author matty
*/
public class Chapter6Part2Assignment {

/**
* @param args the command line arguments
*/
static long cardnumber= 4440967484181607L;
public static void main(String[] args) {
// asking for card number
System.out.println("please enter the card number:/n");
System.out.println(cardnumber + "is"+ (validitychk(cardnumber)?"valid":"invlaid"));
System.out.println(); }
public static boolean validitychk(long cnumber) {
//return statemnt
return (thesize(cardnumber) >= 13 && thesize(cnumber) <= 16) && (prefixmatch(cardnumber, 4)

|| prefixmatch(cardnumber, 5) || prefixmatch(cnumber, 37) || prefixmatch(cardnumber, 6))

&& ((sumdoubleeven(cnumber) + sumodd(cnumber)) % 10 == 0);
}
public static int thesize(long cardnumber){
String cardnumberString= cardnumber +"";
return cardnumberString.length();
}
public static boolean prefixmatch(longcardnumber, int num) {
return true;
}
public static int sumdoubleeven(long cardnumber){
int sum = 0;
String num = cardnumber + "";
for (int i = thesize(cardnumber) - 2; i >= 0; i -= 2)
sum += getDigit(Integer.parseInt(num.charAt(i) + "") * 2);

return sum;
}
public static int getDigit(int carnumber) {
if (carnumber<9)
return cardnumber;
return cardnumber / 10 + cardnumber % 10;
}
public static int sumodd(long cardnumner){
int sum=0;
String num=cardnumber+"";
for(int i=thesize(cardnumber)-1;i>=0;i-=2)
sum += Integer.parseInt(num.charAt(i)+"");
return sum;
}
}

I also attached an image where the issue was thanks!

The image contains Java code and an error message output from an Integrated Development Environment (IDE).

### Code Explanation:

1. **Method: `prefixMatched`**
- **Signature:** `public static boolean prefixMatched(long cardnumber, int num)`
- **Purpose:** It is designed to check some condition related to the prefix of a given card number. Currently, it always returns `true`.

2. **Method: `sumDoubleEven`**
- **Signature:** `public static int sumDoubleEven(long cardnumber)`
- **Purpose:** Computes the sum of double the even-position digits in the card number.
- **Logic:**
- Iterates over the card number from the second-to-last digit to the start.
- Doubles each even-position digit and adds the results using the `getDigit` method.

3. **Method: `getDigit`**
- **Signature:** `public static int getDigit(int cardnumber)`
- **Purpose:** Returns the individual digit if less than 9; otherwise, splits the digits and returns their sum.
- **Logics:**
- Checks if `cardnumber` is less than 9, returns it directly.
- Otherwise, splits the number and returns the sum of its digits.

4. **Method: `sumOdd`**
- **Signature:** `public static int sumOdd(long cardnumber)`
- **Purpose:** Sums the digits at odd positions in the card number.
- **Logic:**
- Iterates over the card number from the last digit to the start, adding all odd-position digits.

### Error Output:

- **Title:** "Output - Chapter 6 part 2 assignment (run)"
- **Error:**
- A JNI error has occurred. The error type is `NoClassDefFoundError: longcardnumber`.
- **Details:**
- The error indicates that the class `longcardnumber` cannot be found, suggesting issues in classpath setup or a missing compiled class.
- **Trace:**
- Several Java classes and methods are referenced in the stack trace, including `java.lang.Class`, methods like `getDeclaredMethods`, `getMethod`, and specifics of `ClassLoader`.

### Debugging Suggestions:

- Ensure all Java classes are compiled.
- Verify CLASSPATH and ensure the necessary classes are included.
- Consult IDE setup guides for resolving common JNI and classpath issues.

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