[英]How to add 2 elements from 2 different JTextField to one JList
如何將來自不同 JTextField 的元素添加到一個列表中。 我試圖將元素放在字符串中並將它們添加到列表中,但這不起作用。
您必須將字符串添加到備份JList
的列表模型中。 這是一個簡短的示例代碼,每當您在文本字段中按 ENTER 時,它都會將當前JTextField
的值附加到列表中:
import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.BorderLayout;
public final class Example extends JFrame {
public Example() {
setLayout(new BorderLayout());
// Create a list model and populate it with two initial items.
final DefaultListModel<String> model = new DefaultListModel<String>();
model.addElement("Initial 1");
model.addElement("Initial 2");
// Create a JList (wrapped into a JScrollPane) from the model
add(new JScrollPane(new JList<String>(model)), BorderLayout.CENTER);
// Create a JTextField at the top of the frame.
// Whenever you click ENTER in that field, the current string gets
// appended to the list model and will thus show up in the JList.
final JTextField field1 = new JTextField("Field 1");
add(field1, BorderLayout.NORTH);
field1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println("Append " + field1.getText());
model.addElement(field1.getText());
}
});
// Create a JTextField at the bottom of the frame.
// Whenever you click ENTER in that field, the current string gets
// appended to the list model and will thus show up in the JList.
final JTextField field2 = new JTextField("Field 2");
add(field2, BorderLayout.SOUTH);
field2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println("Append " + field2.getText());
model.addElement(field2.getText());
}
});
}
public static void main(String[] args) {
final JFrame frame = new Example();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) { System.exit(1); }
});
frame.pack();
frame.setVisible(true);
}
}
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