java - 将数组的输出格式化为列

Question

我只是需要一些帮助来将输出格式化为特定的方式。我满足了作业的所有要求，除了输出。

对于这篇文章的错误格式，我深表歉意，非常感谢任何建议和帮助。

我需要输出如下:

Mr. Random - $500
Mr. BobRandom - $250
etc-8 more times
(sum total of all dollars)

这是我的代码:

import javax.swing.JOptionPane;
import java.util.Arrays;

public class PeerTutors {
    public static void main(String[] args) {
        String[] myNameArray = new String[2];
        String[] myGradeArray = new String[2];
        double[] myStudentArray = new double[2];
        double[] stipend = new double[2];
        int sum = 0;

        for (int i = 0; i < 2; i++) {
            myNameArray[i] = (JOptionPane
                    .showInputDialog(null,
                            "Enter the Peer Tutor name, last name then followed by the first name."));

        }
        Arrays.sort(myNameArray, String.CASE_INSENSITIVE_ORDER);
        JOptionPane.showMessageDialog(null, "The Peer Tutors Names are :"
                + Arrays.toString(myNameArray));

        for (int a = 0; a < 2; a++) {
            myGradeArray[a] = JOptionPane.showInputDialog(null,
                    "Please enter the highest degree earned for: "
                            + myNameArray[a]);
        }
        JOptionPane.showMessageDialog(null, "The Peer Tutors Names are :"
                + Arrays.toString(myNameArray) + Arrays.toString(myGradeArray));

        for (int b = 0; b < 2; b++) {
            myStudentArray[b] = Double.parseDouble(JOptionPane.showInputDialog(
                    null, "Please enter the number of students"
                            + myNameArray[b] + " has assisted"));
        }
        JOptionPane.showMessageDialog(null,
                "The Peer Tutors Report: " + Arrays.toString(myNameArray)
                        + "with" + Arrays.toString(myStudentArray)
                        + " of children tutoring");

        for (int c = 0; c < 2; c++) {
            if (myGradeArray[c].equals("BS")) {
                stipend[c] = 9.5 * myStudentArray[c];

            } else if (myGradeArray[c].equals("MS")) {
                stipend[c] = 15 * myStudentArray[c];

            } else {
                stipend[c] = 20 * myStudentArray[c];
            }
        }
        for (double d : stipend) {
            sum += d;
        }

        for (int d = 0; d < 2; d++) {
            JOptionPane.showMessageDialog(null, myNameArray[d] + "-"
                    + stipend[d] + "\n");

        }
    }
}

Answer 1

基本上，对于每一列，您都需要某种类型的列表(数组或最好是List)。您还需要维护每列最大宽度的信息(我通常将其放在另一个 List 中)。

您需要循环每一行，分解为它的列元素，并将每个元素放置在相应的列List中。您还应该计算每列的宽度要求。

一旦你把这一切都结构化了，你需要重建输出，使用像StringBuilder这样的东西来重建输出的每一行，但这样每一列都有所需的额外间距让色谱柱流动。

已更新示例

现在，通常，我会将每一行存储为单独的对象，因为这样可以更轻松地保持行总数的一致想法，但是，使用您的代码作为起点...

import java.text.NumberFormat;

public class TestTextColumnFormatting {

    public static void main(String[] args) {
        String[] myNameArray = new String[]{
            "Mr. Samete",
            "Ms. Torbura",
            "Mr. Perem",
            "Mr. Rothaw",
            "Miss. Endemos",
            "Mr. Chomoshon",
            "Mrs. Aldir",};
        double[] stipends = new double[]{
            500,
            200,
            300,
            1000,
            250,
            125,
            600,
            338
        };
        NumberFormat nf = NumberFormat.getCurrencyInstance();
        double tally = 0;

        int columnWidths[] = new int[2];
        for (int index = 0; index < myNameArray.length; index++) {
            columnWidths[0] = Math.max(columnWidths[0], myNameArray[index].length());
            columnWidths[1] = Math.max(columnWidths[1], nf.format(stipends[index]).length());
            tally += stipends[index];
        }

        columnWidths[1] = Math.max(columnWidths[1], nf.format(tally).length());

        StringBuilder sb = new StringBuilder(128);
        for (int index = 0; index < myNameArray.length; index++) {

            String name = myNameArray[index];
            String stipend = nf.format(stipends[index]);

            sb.append(name).append(fill(name, columnWidths[0], ' ')).append(" ");
            sb.append(fill(stipend, columnWidths[1], ' ')).append(stipend);
            sb.append("\n");

        }


        sb.append(fill("", columnWidths[0], ' ')).append(" ");
        sb.append(fill("", columnWidths[1], '=')).append("\n");
        sb.append(fill("", columnWidths[0], ' ')).append(" ");
        sb.append(fill(nf.format(tally), columnWidths[1], ' ')).append(nf.format(tally));
        sb.append("\n");

        System.out.println(sb.toString());

    }

    public static String fill(String sValue, int iMinLength, char with) {

        StringBuilder filled = new StringBuilder(iMinLength);

        while (filled.length() < iMinLength - sValue.length()) {

            filled.append(with);

        }

        return filled.toString();

    }
}

这将输出类似...的内容

Mr. Samete      $500.00
Ms. Torbura     $200.00
Mr. Perem       $300.00
Mr. Rothaw    $1,000.00
Miss. Endemos   $250.00
Mr. Chomoshon   $125.00
Mrs. Aldir      $600.00
              =========
              $2,975.00

已更新

我真是个白痴，我刚刚意识到你正在使用 JOptionPane :P

最简单的解决方案是构建一个 HTML 表并让 Swing 为您呈现它...

import java.text.NumberFormat;
import javax.swing.JOptionPane;

public class TestTextColumnFormatting {

    public static void main(String[] args) {
        String[] myNameArray = new String[]{
            "Mr. Samete",
            "Ms. Torbura",
            "Mr. Perem",
            "Mr. Rothaw",
            "Miss. Endemos",
            "Mr. Chomoshon",
            "Mrs. Aldir",};
        double[] stipends = new double[]{
            500,
            200,
            300,
            1000,
            250,
            125,
            600,
            338
        };
        NumberFormat nf = NumberFormat.getCurrencyInstance();
        double tally = 0;

        StringBuilder sb = new StringBuilder(128);
        sb.append("<html><table border='0'>");
        for (int index = 0; index < myNameArray.length; index++) {

            String name = myNameArray[index];
            String stipend = nf.format(stipends[index]);

            sb.append("<tr><td align='left'>");
            sb.append(name);
            sb.append("</td><td align='right'>");
            sb.append(stipend);
            sb.append("</td></tr>");

            tally += stipends[index];

        }
        sb.append("<tr><td align='center'>");
        sb.append("</td><td align='right'>");
        sb.append(nf.format(tally));
        sb.append("</td></tr>");

        JOptionPane.showMessageDialog(null, sb.toString());

    }
}