我们能否通过 Java 请求用户输入来从 JOptionPane 读取数据?

java 8object oriented programmingprogramming

是的，我们可以从 JOptionPane 读取数据。在这里，我们将在字符串变量 − 中获取 showInputDialog() 的结果

String input = JOptionPane.showInputDialog("Enter the C++ lessons you covered till now?");

获取结果后，我们将使用 parseInt() 将其转换为整数并将其显示在控制台 −

int res = Integer.parseInt(input);
System.out.println("Lessons covered = "+res);

以下是通过请求用户输入来从 JOptionPane 读取数据的示例 −

示例

package my;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.net.URL;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
public class SwingDemo {
   public static void main(String[] args) throws Exception {
      ImageIcon icon = new ImageIcon(new URL("http −//www.tutorialspoint.com/images/C-PLUS.png"));
      JLabel label = new JLabel(icon);
      JPanel panel = new JPanel(new GridBagLayout());
      panel.add(label);
      panel.setOpaque(true);
      panel.setBackground(Color.ORANGE);
      JPanel textPanel = new JPanel(new GridLayout(10, 5));
      for (int i = 0; i < 20; i++) {
         textPanel.add(new JLabel("Learn C++"));
      }
      JPanel panel2 = new JPanel(new BorderLayout());
      panel2.add(textPanel);
      panel2.add(panel, BorderLayout.EAST);
      JOptionPane.showMessageDialog(null, panel2, "Course",JOptionPane.DEFAULT_OPTION);
      String input = JOptionPane
      .showInputDialog("Enter the C++ lessons you covered till now?");
      int res = Integer.parseInt(input);
      System.out.println("Lessons covered = "+res);
   }
}