java - 将可编辑文本框添加到 JFrame

Question

关闭。这个问题需要多问 focused 。目前不接受答案。

---

想要改进此问题吗？更新问题，使其仅关注一个问题 editing this post .

已关闭 9 年前。

Improve this question

有没有办法将文本框放入用户可以输入文本的 JFrame 中？有点像 TextEdit 或记事本应用程序。

Answer 1

与记事本最接近的等效项是JTextArea。将其包装在用于滚动条的 JScrollPane 中。可见。

提示:将其设为原生 PLAF，以获得更接近的外观。

import java.awt.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;

public class Editpad {

    public static void main(String[] args) {
        Runnable r = new Runnable() {
            @Override
            public void run() {
                // the GUI as seen by the user (without frame)
                JPanel gui = new JPanel(new BorderLayout());
                gui.setBorder(new EmptyBorder(2,3,2,3));

                // adjust numbers for a bigger default area
                JTextArea editArea = new JTextArea(5,40);
                // adjust the font to a monospaced font.
                Font font = new Font(
                        Font.MONOSPACED, 
                        Font.PLAIN, 
                        editArea.getFont().getSize());
                editArea.setFont(font);
                gui.add(new JScrollPane(editArea,
                        JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
                        JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS));

                JFrame f = new JFrame("Editpad");
                f.add(gui);
                // Ensures JVM closes after frame(s) closed and
                // all non-daemon threads are finished
                f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                // See http://stackoverflow.com/a/7143398/418556 for demo.
                f.setLocationByPlatform(true);

                // ensures the frame is the minimum size it needs to be
                // in order display the components within it
                f.pack();
                // should be done last, to avoid flickering, moving,
                // resizing artifacts.
                f.setVisible(true);
            }
        };
        // Swing GUIs should be created and updated on the EDT
        // http://docs.oracle.com/javase/tutorial/uiswing/concurrency
        SwingUtilities.invokeLater(r);
    }
}