JTextArea得到整行 [英] JTextArea getting whole line

问题描述

如何从JTA中选择行?

How can I get chosen line from JTA ?

推荐答案

为什么不将行拆分为标记.那么如果您知道所需的行号，则可以通过一个字符串数组来访问它

Why not break the lines up into tokens. then if you know the line number you want, you can just access it via an array of Strings

public class JTALineNum extends JFrame{
 JTextArea jta = null;
 JButton button = null;

 public JTALineNum(){
  jta = new JTextArea();
  button = new JButton("Hit Me");

  button.addActionListener(new ButtonListener());

  add(jta, BorderLayout.CENTER);
  add(button, BorderLayout.SOUTH);
  setSize(200,200);
  setVisible(true);
 }

 private class ButtonListener implements ActionListener{

  public void actionPerformed(ActionEvent e) {
   String text = jta.getText();
   String[] tokens = text.split("\n");
   for(String i : tokens){
    System.out.println("Token:: " + i);
   }
  }
 }

 public static void main(String args[]){
  JTALineNum app = new JTALineNum();
  app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 }
}

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