オブジェクトの配列があり、各オブジェクトには char 値と int 値が含まれています。別の char 配列の項目がオブジェクトの配列の char メンバーのいずれかと一致するかどうかをチェックするプログラムを作成しようとしています。yes の場合、合計に int 値を追加します。たとえば、次のようになります。
この配列の index[i] のメンバーの場合
char[] array = { 'a', 'r', 't', 'd', 's', 'f' };
このオブジェクト配列の char メンバーのいずれかと一致しました (ここでは、文字 'r' が一致します)
RomanToArabicNums [] table = {
new RomanToArabicNums('h', 1000),
new RomanToArabicNums('r', 200)
};
次に、そのオブジェクト配列の int 値 (この場合は 200) を に追加しint sumます。
完全なコードは次のとおりです (問題のメソッドは ) fromRomanToArabic() です。
package romantoarabicnums;
import javax.swing.JOptionPane;
public class RomanToArabicNums {
private static String userString;
private static int userNumber;
private static char letter;
private static int letterNum;
public RomanToArabicNums (String s) throws NumberFormatException {
for (int i = 0; i < s.length(); i++) {
if (s.charAt(i) == 'M' ||s.charAt(i) == 'M' ||s.charAt(i) == 'C' ||s.charAt(i) == 'D' ||
s.charAt(i) == 'X' ||s.charAt(i) == 'L' ||s.charAt(i) == 'V' ||s.charAt(i) == 'I' ) {
userString += s.charAt(i);
}
else {throw new NumberFormatException("Only M,C,D,X,V and I allowed");}
}
}
public RomanToArabicNums (int num) throws NullPointerException {
if (num >= 1 && num <= 3999) {
RomanToArabicNums.userNumber = num;
}
else {throw new NumberFormatException("numbers between 1 and 3999 only!");}
}
public RomanToArabicNums (char letter, int num) {
this.letter = letter;
this.letterNum = num;
}
public char getLetter () {return letter;}
public int getLetterNum () {return letterNum;}
public static void main(String[] args) {
//RomanToArabicNums r1 = new RomanToArabicNums(4080);
RomanToArabicNums r2 = new RomanToArabicNums("MCMXCV");
//System.out.println("the roman representation is: " + r1.fromArabicToRoman());
System.out.println("the arabic number is: " + r2.fromRomanToArabic("MCMXCV"));
}
/* convert Roman characters to Arabic numbers */
public int fromRomanToArabic (String userString) {
int sum=0;
//char [] charArray = userString.toCharArray();
RomanToArabicNums [] table = new RomanToArabicNums[7];
table [0] = new RomanToArabicNums('M', 1000);
table [1] = new RomanToArabicNums('D', 500);
table [2] = new RomanToArabicNums('C', 100);
table [3] = new RomanToArabicNums('L', 50);
table [4] = new RomanToArabicNums('X', 10);
table [5] = new RomanToArabicNums('V', 5);
table [6] = new RomanToArabicNums('I', 1);
for (RomanToArabicNums obj : table) {
for (int i = 0; i < userString.length(); i++) {
if (userString.indexOf(i) == table[i].getLetter()) {
if (table[i].getLetter() < table[i+1].getLetter()) {
sum += table[i+1].getLetterNum() - table[n].getLetterNum();
}
sum += table[i].getLetterNum();
}
}
}
return sum;
}
/* converr Arabic number to Roman characters */
public static String fromArabicToRoman () {
String roman = "";
int num = userNumber;
while (num >= 1000) {roman += "M"; num -= 1000;}
while (num >= 900) {roman += "CM"; num -= 900;}
while (num >= 500) {roman += "D"; num -= 500;}
while (num >= 400) {roman += "CD"; num -= 400;}
while (num >= 100) {roman += "C"; num -= 100;}
while (num >= 90) {roman += "XC"; num -= 90;}
while (num >= 50) {roman += "L"; num -= 50;}
while (num >= 40) {roman += "XL"; num -= 40;}
while (num >= 10) {roman += "X"; num -= 10;}
while (num >= 9) {roman += "IX"; num -= 9;}
while (num >= 5) {roman += "V"; num -= 5;}
while (num >= 4) {roman += "IV"; num -= 4;}
while (num >= 1) {roman += "I"; num -= 1;}
return roman;
}
}