1

我在计算机科学课的编程作业上遇到了麻烦。该程序是添加到罗马数字。我不知道如何开始使用实际将罗马数字相加并输出两个数字之和的代码：这是我到目前为止的主程序代码：

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

/**
 * Class RomanNumeralCalculator - write a description of the class here
 * 
 * @author (your name) 
 * @version (a version number)
*/
public class RomanNumeralCalculator extends JFrame
{
   public static JPanel panel1, panel2, panel3, panel4;
   public static JLabel main1, main2, label1, label2,label3,label4,image;
   public static JTextField number1, number2;
   public static JTextArea output;
   public static JButton calculate,exit;
   public static String input="Enter"; 
   public static int position;
String num="";
public RomanNumeralCalculator()
{
    super ("Roman Numeral Calculator");
    setSize(1045,740);
    setLocation(0,0);
    Container container = getContentPane();
    container.setBackground(Color.GREEN);

    JLabel image=new JLabel(new ImageIcon("romanNumerals.jpg"));

    panel1=new JPanel();
    panel2=new JPanel();
    panel3=new JPanel();
    panel4=new JPanel();

    panel1.setLayout(new GridLayout(2,7));
    panel1.setBackground(Color.GREEN);
    panel2.setLayout(new FlowLayout());
    panel2.setBackground(Color.MAGENTA);
    panel3.setLayout(new FlowLayout());
    panel3.setBackground(Color.YELLOW);
    panel4.setLayout(new FlowLayout());
    panel4.setBackground(Color.GRAY);

    JLabel main1=new JLabel("Welcome To The Roman Numerals Calculator");
    JLabel main2=new JLabel("BY: Harpreet Singh, Date: 31/10/2013");

    label3=new JLabel("Here are the following numbers that can be used in the calculator:");
    label4=new JLabel("I=1 , V=5 , X=10 , L=50 , C=100 , D=500 , M=1000");

    calculate=new JButton("Calculate");
    exit=new JButton("Exit");

    ButtonHandler handler = new ButtonHandler();
    calculate.addActionListener(handler);
    exit.addActionListener(handler);

    label1=new JLabel("Enter first number in roman numerals:");
    number1=new JTextField("",10);
    label2=new JLabel("Enter second number in roman numerals:");
    number2=new JTextField("",10);

    output=new JTextArea(10,100);
    output.setEditable(false);

    container.setLayout(new BorderLayout());
    container.add(panel1, BorderLayout.NORTH);
    container.add(panel2, BorderLayout.CENTER);
    container.add(panel3, BorderLayout.SOUTH);

    panel1.add(main1);
    panel1.add(main2);
    panel1.add(image);
    panel2.add(label3);
    panel2.add(label4);
    panel3.add(label1);
    panel3.add(number1);
    panel3.add(label2);
    panel3.add(number2);
    panel3.add(calculate);        
    panel3.add(exit);

    setVisible(true);
}

public class ButtonHandler implements ActionListener
{
    public void actionPerformed(ActionEvent e)
    {
        if (e.getSource()==calculate)
        {
            String num1=number1.getText();
            String num2=number2.getText();
            CalculateNumbers x=new CalculateNumbers();
            x.calculations(num1,num2);
        }
        else if (e.getSource()==exit)
        {
            System.exit(0);
        }
    }
}

public static void main (String args[])
{
    /*String choice=JOptionPane.showInputDialog(null, "Please Type In 'Enter' to Continue: ", "Enter", JOptionPane.PLAIN_MESSAGE);
    if ((choice == null) || ((choice != null) && !(choice.equalsIgnoreCase(input))))
    {
    JOptionPane.showMessageDialog(null, "Invalid Password. Please Try Again.");
    System.exit(0);
    }*/
    //else
    //{
    //JOptionPane.showMessageDialog(null, "Correct Password");
    RomanNumeralCalculator application = new RomanNumeralCalculator();
    //}
}

}

4

3 回答 3

5

先写两个方法

  1. 将罗马数字转换为常规数字
  2. 将常规数字转换为罗马数字

当用户以罗马数字提供输入时，将它们转换为常规数字执行算术运算，最后将结果转换为罗马数字

另请检查将罗马数字转换为十进制和将 Int 转换为罗马数字

于 2013-11-05T15:14:35.043 回答
0 
       import java.util.Scanner;

        public class Roman {

        public static void main(String[] args) {

        Scanner stdIn = new Scanner(System.in);

         System.out.print("Enter a Roman Number:> ");

          char[] roman = stdIn.nextLine().toCharArray();

    int total = 0;
    for(int i = roman.length-1; i > -1; i--){
        switch(roman[i]){
            case 'I':
                total += value(roman[i]); break;
            case 'V':
            case 'X':
            case 'L':
            case 'C':
            case 'D':
            case 'M':
                if(i != 0 && (value(roman[i-1]) < value(roman[i]))){
                    total += value(roman[i]) - value(roman[i-1]);
                    i--;
                }else{
                    total += value(roman[i]);
                }
                break;
        }
    }
    System.out.println(total);
}

public static int value(char c){
    switch(c){
        case 'I':
            return 1;
        case 'V':
            return 5;
        case 'X':
            return 10;
        case 'L':
            return 50;
        case 'C':
            return 100;
        case 'D':
            return 500;
        case 'M':
            return 1000;
        default:
            return 0;
    }
} }
于 2013-11-05T15:30:27.897 回答
0

创建一个罗马数字类，它将在给定十进制数的情况下转换您的数字，反之亦然。如果需要，您甚至可以将其设为静态。

这将使您的代码看起来更好，更面向对象。

这里有一个算法解释。

罗马数字算法

于 2013-11-05T15:16:19.617 回答