我尝试在JOptionPane中打印随机的1d和2d数组。 但它是这样的:
有没有办法将它格式化为这样排列:
行和col也是随机的。
另一件事,有没有办法只使用一个函数来打印1d和2d数组?如果没有,2d功能可以使用第一个吗? 这是为学校作业。我们不允许搞乱JOptionPane。它应该保持这样:JOptionPane.showMessageDialog(null,String);
public static String printMatrix(int[] m) {
String result = "";
for (int i = 0; i < m.length; i++) {
result += m[i] + " ";
}
return result;
}
public static String printMatrix2D(int[][] m) {
String result = "";
for (int i = 0; i < m.length; i++) {
for (int j = 0; j < m[i].length; j++) {
result += m[i][j] + " ";
}
result += "\n";
}
return result;
}
答案 0 :(得分:1)
如果您希望将您的号码放置在表格中,则需要使用GridLayout
创建一个JPanel
,其中包含hgap
和vgap
。这适用于4位和5位数字或任意数量的数字。
例如:
import java.awt.Color;
import java.awt.GridLayout;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class JOptionPanePrintingInColumns {
private JPanel pane;
private String[] oneDArray = new String[] {"1000", "10000", "99999", "23000", "100000"};
private String[][] twoDArray = new String[][] {
{"1000", "10000", "99999", "23000", "100000"},
{"1000", "10000", "99999", "23000", "100000"},
{"1000", "10000", "99999", "23000", "100000"},
{"1000", "10000", "99999", "23000", "100000"},
{"1000", "10000", "99999", "23000", "100000"}
};
public static void main(String[] args) {
SwingUtilities.invokeLater(new JOptionPanePrintingInColumns()::createAndShowGui);
}
private void createAndShowGui() {
//For the 1D Array
pane = new JPanel();
pane.setLayout(new GridLayout(0, 5, 50, 10));
for (int i = 0; i < oneDArray.length; i++) {
JLabel label = new JLabel(oneDArray[i]);
label.setBorder(BorderFactory.createLineBorder(Color.BLACK));
pane.add(label);
}
JOptionPane.showMessageDialog(new JFrame(), pane);
//For the 2D array
pane = new JPanel();
pane.setLayout(new GridLayout(0, 5, 50, 10));
for (int i = 0; i < twoDArray.length; i++) {
for (int j = 0; j < twoDArray[i].length; j++) {
JLabel label = new JLabel(twoDArray[i][j]);
label.setBorder(BorderFactory.createLineBorder(Color.BLACK));
pane.add(label);
}
}
JOptionPane.showMessageDialog(new JFrame(), pane);
}
}
这会产生这样的结果:
因为我们可以看到边框,我们可以注意到每个标签的大小与最大的标签大小相同(即每行中的最后一个),这就是它适用于更大或更短数字的原因。
您可能已经注意到我使用了这一行:
pane.setLayout(new GridLayout(0, 5, 50, 10));
但是0
意味着什么?这意味着“根据需要创建尽可能多的行,每行5列”,因此这适用于1D或2D数组,只是改变了从每个数组获取数据的方式。
但我忘了提到这是为了学校的功课。我们不允许搞乱JOptionPane。它应该保持这样:JOptionPane.showMessageDialog(null,String);
您可以在String中使用HTML
标签将其转换为表格,然后将每个数字放在其单元格内,使用一些cellspacing
来提供更多或更少的空间(使用它) :
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class JOptionPanePrintingInColumns {
private JPanel pane;
private String[] oneDArray = new String[] {"1000", "10000", "99999", "23000", "100000"};
private String[][] twoDArray = new String[][] {
{"1000", "10000", "99999", "23000", "100000"},
{"100", "180000", "9999", "3000", "1090000"},
{"111000", "1220000", "9955999", "230100", "1000200"},
{"10010", "1005400", "9999954", "9", "123"},
{"100430", "1000054", "999", "23123000", "123456789"}
};
public static void main(String[] args) {
SwingUtilities.invokeLater(new JOptionPanePrintingInColumns()::createAndShowGui);
}
private void createAndShowGui() {
String output;
StringBuilder sb = new StringBuilder();
sb.append("<html><table><tr>");
for (int i = 0; i < oneDArray.length; i++) {
sb.append("<td>").append(oneDArray[i]).append("</td>");
}
sb.append("</tr></table></html>");
output = sb.toString();
JOptionPane.showMessageDialog(new JFrame(), output);
sb = new StringBuilder();
sb.append("<html><table cellspacing=10>");
for (int i = 0; i < twoDArray.length; i++) {
sb.append("<tr>");
for (int j = 0; j < twoDArray.length; j++) {
sb.append("<td>").append(twoDArray[i][j]).append("</td>");
}
}
sb.append("</tr></table></html>");
output = sb.toString();
JOptionPane.showMessageDialog(new JFrame(), output);
}
}