仅删除文本区域中的选定文本 [英] deleting only a selected text in a text area

问题描述

我想使用 Java Swing 删除文本区域中的选定文本，但我找不到方法.在某些时候，我想过使用 textArea.setText(""); 但是，当我这样做时，它会清除所有内容.有人可以帮我解决这个问题吗?

I want to delete selected text in a text area using Java Swing, but I couldn't find a way to do that. At some point I thought of using textArea.setText(""); but, when I do, it clears out everything. Can some one please help me with this?

这是我目前编写的代码，

Here is the code I've written so far,

public class DeleteTest extends JFrame implements ActionListener {

JPanel panel;
JTextArea textArea;
JButton button;

public DeleteTest() {

    setVisible(true);
    setSize(500, 500);
    setDefaultCloseOperation(EXIT_ON_CLOSE);

    panel = new JPanel();
    panel.setBackground(getBackground().BLACK);
    textArea = new JTextArea(300, 300);
    button = new JButton("clear");

    button.addActionListener(this);

    panel.add(button);

    add(textArea, BorderLayout.CENTER);
    add(panel, BorderLayout.SOUTH);

}

@Override
public void actionPerformed(ActionEvent arg0) {
    if (arg0.getSource()==button){
        String selected=textArea.getSelectedText();
        if(!selected.equals("")){


        }
    }

}

public static void main(String[] args) {
    Runnable r = new Runnable() {

        @Override
        public void run() {
            DeleteTest de = new DeleteTest();

        }
    };

    SwingUtilities.invokeLater(r);

}

}

推荐答案

如果您只想删除选定的文本，请尝试以下操作:

If you wanna remove only selected text then try this:

textArea.setText(textArea.getText().replace(textarea.getSelectedText(),""));

希望这会有所帮助.

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