java实现文本的选择性复制

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java实现文本的左右复制
import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.border.*;public class copy{JFrame frame = new JFrame ("输入文本复制");JTextArea ta1,ta2;JButton copy1,copy2;public static void main(String args[]){copy tad = new copy();tad.go();}public void go(){ta1 = new JTextArea(20,20);ta1.setSelectedTextColor(Color.blue);//设置选中文本的颜色为蓝色ta2 = new JTextArea(20,20);ta2.setSelectedTextColor(Color.red);//设置选中为红色//放置到JScrollPane中JScrollPane jsp1 = new JScrollPane(ta1,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);JScrollPane jsp2 = new JScrollPane(ta2,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);copy1 = new JButton("————>");//将ta1中选中文本或所有内容复制到ta2copy1.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){if (ta1.getSelectedText()!=null)ta2.append(ta1.getSelectedText()+"\n");elseta2.append("\n"+ta1.getText()+"\n");}});copy2 = new JButton("<————");//将ta1中选中文本或所有内容复制到ta2copy2.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){if (ta2.getSelectedText()!=null)ta1.append(ta2.getSelectedText()+"\n");elseta1.append("\n"+ta2.getText()+"\n");}});JPanel panel1 = new JPanel();panel1.add(jsp1);Border etched = BorderFactory.createEtchedBorder();panel1.setBorder(etched);JPanel panel2 = new JPanel();panel2.add(copy1);panel2.add(copy2);JPanel panel3 = new JPanel();panel3.add(jsp2);panel3.setBorder(etched);Container cp = frame.getContentPane();cp.add(panel1,BorderLayout.WEST);cp.add(panel2,BorderLayout.CENTER);cp.add(panel3,BorderLayout.EAST);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.pack();frame.setSize(700,500);frame.setVisible(true);}}
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