// DocumentListener myListener = new myListener();
//textArea.getDocument().addDocumentListener(myListener); textArea.addMouseListener(new MouseAdapter() { int orgX,orgY; public void mousePressed(MouseEvent e) { orgX = e.getX(); orgY = e.getY(); } public void mouseReleased(MouseEvent e) { text.setText(textArea.getSelectedText()); }
}); }
public static final int WIDTH = 300; public static final int HEIGHT = 200; private TextField text; private TextArea textArea; }/* class myListener implements DocumentListener {
你可以JTextArea a=new JTextArea("+-*/"), //建立新的JTextArea并用+-*/初始化
然后 String b=a.getSelectedText(); //用b保存返回的值
JTextField c=new JTextField(); //建立一个新的JTextField
c.setText(b); //将JTextField的文本设为b
import java.awt.event.*;
import java.applet.*;
import javax.swing.*;
import javax.swing.event.*;public class MouseDraw
{
public static void main(String[] args)
{
MouseFrame frame = new MouseFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.show();
}
}class MouseFrame extends JFrame
{
public MouseFrame()
{
setSize(WIDTH, HEIGHT);
Container contentPane = getContentPane();
NewObject();
contentPane.add(text,BorderLayout.SOUTH);
contentPane.add(textArea,BorderLayout.CENTER);
} public void NewObject()
{
text = new TextField();
textArea=new TextArea(4,4);
textArea.insert("+",0);
textArea.insert("-",1);
textArea.insert("*",2);
textArea.insert("/",3);
// DocumentListener myListener = new myListener();
//textArea.getDocument().addDocumentListener(myListener);
textArea.addMouseListener(new MouseAdapter()
{
int orgX,orgY;
public void mousePressed(MouseEvent e)
{
orgX = e.getX();
orgY = e.getY();
}
public void mouseReleased(MouseEvent e)
{
text.setText(textArea.getSelectedText());
}
});
}
public static final int WIDTH = 300;
public static final int HEIGHT = 200;
private TextField text;
private TextArea textArea;
}/*
class myListener implements DocumentListener
{
}*/