找不到符号符号错误继承括号

Question

我的作业是一个迷你桌面计算器，具有不同的类和实践继承。我有一个包含所有方法的长整数类，以及4个子类，称为二进制，八进制，十六进制和十进制，以及一个提示用户并运行while循环的驱动程序类。我的驱动程序类中有一个错误，这里是底部的代码和错误，我不知道这是什么或如何解决它。任何建议都很可爱：）

public class IntDriver {
public static void main(String[] args) {
    Scanner s = new Scanner(System.in);
    LongInteger object;
    String mode, digits;
    boolean b = true;
    System.out.println("Welcome to the Programmer calculator application. Please     pick a mode.\n");
    mode = menu(s);
    if(mode.equals("T")) {
        System.out.print("Enter in a number in forms of 0 - 9: ");
        digits = s.nextLine();
        b = validateDecimal(digits);
        while(!b) {
            System.out.println("Sorry. You need to input a number in forms of 0 through 9.");
            digits = s.nextLine();
            b = validateDecimal(digits);
        }
        object = new DecimalInteger(digits);
    } else if(mode.equals("W")) {
        System.out.print("Enter in a number in forms of 0 or 1: ");
        digits = s.nextLine();
        b = validateBinary(digits);
        while(b == false) {
            System.out.println("Sorry. You need to input a number in forms of 0s or 1s.");
            digits = s.nextLine();
            b = validateDecimal(digits);
        }
        object = new BinaryInteger(digits);
    } else if(mode.equals("O")) {
        System.out.print("Enter in a number in forms of 0 through 7: ");
        digits = s.nextLine();
        b = validateOctal(digits);
        while(b == false) {
            System.out.println("Sorry. You need to input a number in forms of 0 through 7.");
            digits = s.nextLine();
            b = validateDecimal(digits);
        }
        object = new octalInteger(digits);
    } else {
        System.out.print("Enter in a number in forms of 0 through 9 and/or A through F: ");
        digits = s.nextLine();
        b = validateHexadecimal(digits);
        while(b == false) {
            System.out.println("Sorry. You need to input a number in forms of 0 through 7.");
            digits = s.nextLine();
            b = validateHexadecimal(digits);
        }
        object = new HexInteger(digits);
    }
    }

    public static String menu(Scanner s) {
    System.out.println("Decimal     -       T");
    System.out.println("Binary      -       W");
    System.out.println("Octal       -       O");
    System.out.println("Hexadecimal -       H\n");
    String l = s.nextLine();
    while(!l.equals("T") && !l.equals("W") && !l.equals("O") && !l.equals("H")) {
        System.out.print("Sorry, you did not pick within the list. Please try again: ");
        l = s.nextLine();
    }
    s.nextLine();
    return l;
    }

     public static boolean validateDecimal(String digits) {
    boolean test = true;
    for(int i = 0; i < digits.length(); i++) {
        if(digits.charAt(i) != '0' && digits.charAt(i) != '1' && digits.charAt(i) != '2' && digits.charAt(i) != '3' && digits.charAt(i) != '4' && digits.charAt(i) != '5' && digits.charAt(i) != '6' && digits.charAt(i) != '7' && digits.charAt(i) != '8' && digits.charAt(i) != '9') {
            test = false;
        } else {
            test = true;
        }
    }
    return test;
    }

    public static boolean validateBinary(String digits) {
    boolean test = true;
    for(int i = 0; i < digits.length(); i++) {
        if(digits.charAt(i) != '0' && digits.charAt(i) != '1') {
            test = false;
        } else {
            test = true;
        }
    }
    return test;
    }

    public static boolean validateOctal(String digits) {
    boolean test = true;
    for(int i = 0; i < digits.length(); i++) {
        if(digits.charAt(i) != '0' && digits.charAt(i) != '1' && digits.charAt(i) != '2' && digits.charAt(i) != '3' && digits.charAt(i) != '4' && digits.charAt(i) != '5' && digits.charAt(i) != '6' && digits.charAt(i) != '7') {
            test = false;
        } else {
            test = true;
        }
    }
    return test;
    }

    public static boolean validateHexadecimal(String digits) {
    boolean test = true;
    for(int i = 0; i < digits.length(); i++) {
        if(digits.charAt(i) != '0' && digits.charAt(i) != '1' && digits.charAt(i) != '2' && digits.charAt(i) != '3' && digits.charAt(i) != '4' && digits.charAt(i) != '5' && digits.charAt(i) != '6' && digits.charAt(i) != '7' && digits.charAt(i) != '8' && digits.charAt(i) != '9' && digits.charAt(i) != 'A' && digits.charAt(i) != 'B' && digits.charAt(i) != 'C' && digits.charAt(i) != 'D' && digits.charAt(i) != 'E' && digits.charAt(i) != 'F') {
            test = false;
        } else {
            test = true;
        }
    }
    return test;
    }
}     

这是错误：

IntDriver.java:40: cannot find symbol
symbol  : class octalInteger
location: class IntDriver
            object = new octalInteger(digits);
                     ^
DecimalInteger.java:6: cannot find symbol
symbol  : constructor LongInteger()
location: class LongInteger
        {
    ^
BinaryInteger.java:6: cannot find symbol
symbol  : constructor LongInteger()
location: class LongInteger
    {
    ^
HexInteger.java:6: cannot find symbol
symbol  : constructor LongInteger()
location: class LongInteger
    {
^
4 errors