开始和结束JTextArea的索引检索

import javax.swing.*;

public class Main {
    public static void main(String[] args) {
        JFrame frame = new JFrame("JTextArea Example");
        JTextArea textArea = new JTextArea("This is a sample text.");
        frame.add(textArea);
        frame.setSize(400, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);

        int startIndex = 0;
        int endIndex = textArea.getText().length();

        System.out.println("Start index: " + startIndex);
        System.out.println("End index: " + endIndex);
    }
}