Question

明天我有一个作业，我完成了，我只是一个错误。好吧，它不是一个错误，因为它是我的输出不是我的老师想要的输出。

我的老师要我使用JOptionPane

创建一个乘法表

这就是我到目前为止所做的：

import javax.swing.JOptionPane;

public class assign3 {

public static void main(String[] args) {

        String Boundary1 = JOptionPane.showInputDialog(null, "Please enter the first boundary of the multiplication table.");
        String Boundary2 = JOptionPane.showInputDialog(null, "Please enter the second boundary of the multiplication table.");

        int X = Integer.parseInt(Boundary1);
        int Y = Integer.parseInt(Boundary2);
        int j = 1;
        String Result = "";
        int x = 1;

        while (x <= X){
            for(int i = 1;i<= Y; i++ ){
                j = i * x;
                Result = Result + j + "    ";
            }
            x++;
            Result = Result + "\n";
        }
        JOptionPane.showMessageDialog(null, Result);
    }
}

我的输出显示如下。

https://www.dropbox.com/s/ulp1gj9sqi94d3a/IMG_20140114_162054.jpg

但我的老师希望输出显示如下。

https://www.dropbox.com/s/6gtexqoj3rs7xvl/IMG-20140114-WA0000.jpg

我的代码在数字之间没有正确的间距，我一直试图以某种方式修复它而没有运气。

Answer 1

您是否尝试过使用String.format("%5d", j)？

它将在5个空格 - 长度上打印每个int。

示例：10将为___10。

或String.format("%-5d", j)与左对齐。

示例：10___。

修改：另一种选择是使用html：

public static void main(String[] args) {

    String Boundary1 = JOptionPane.showInputDialog(null, "Please enter the first boundary of the multiplication table.");
    String Boundary2 = JOptionPane.showInputDialog(null, "Please enter the second boundary of the multiplication table.");

    int X = Integer.parseInt(Boundary1);
    int Y = Integer.parseInt(Boundary2);
    int j = 1;
    String Result = "<html><table>";
    int x = 1;
    while (x <= X){
        Result += "<tr>";
        for(int i = 1;i<= Y; i++ ){

            j = i * x;
            Result += String.format("<td><center>%d</center></td>", j);
        }
        x++;
        Result = Result + "</tr>";
    }

    Result += "</table></html>";

    JOptionPane.showMessageDialog(null, Result);

}

<强>结果：

Result

Answer 2

一种解决方案（假设result已经需要标签（\t））：

JTextArea jf=new JTextArea(result);

jf.setEditable(false);
jf.setOpaque(false);

JOptionPane.showMessageDialog(null, jf);

修改

public static void main(String[] args) { String Boundary1 = JOptionPane.showInputDialog(null, "Please enter the first boundary of the multiplication table."); String Boundary2 = JOptionPane.showInputDialog(null, "Please enter the second boundary of the multiplication table."); int X = Integer.parseInt(Boundary1); int Y = Integer.parseInt(Boundary2); int j = 1; String Result = ""; int x = 1; while (x <= X) { for (int i = 1; i <= Y; i++) { j = i * x; Result = Result + j + "\t"; } x++; Result = Result + "\n"; } JTextArea jt=new JTextArea(Result); jt.setEditable(false); jt.setOpaque(false); jt.setTabSize(3); JOptionPane.showMessageDialog(null, jt); }

<强> O / P：

Answer 3

解决

    public class assign3 {

    public static void main(String[] args) {

        String Boundary1 = JOptionPane.showInputDialog(null, "Please enter the first boundary of the multiplication table.");
        String Boundary2 = JOptionPane.showInputDialog(null, "Please enter the second boundary of the multiplication table.");

        int X = Integer.parseInt(Boundary1);
        int Y = Integer.parseInt(Boundary2);
        int j = 1;
        String Result = "    |"+"\t";
        int x = 1;

        for(int i=1;i<=Y;i++){
                Result = Result + i + "\t";
            }
            Result=Result+"\n";
            while (x <= X){
            if(x<10){
            Result=Result+ x + "  |" +"\t";
            }else{
            Result=Result+ x + "|" +"\t";

            }
            for(int i = 1;i<= Y; i++ ){
                j = i * x;
                Result = Result + j +"\t";
            }
            x++;
            Result = Result + "\n";
        }
        JTextArea jt=new JTextArea(Result);
        jt.setEditable(false);
        jt.setOpaque(false);
        jt.setTabSize(3);
        JOptionPane.showMessageDialog(null, jt);        
    }
    }

输出：

output

使用JOptionPane创建乘法表

3 个答案: