一个窗口包含文本行和标签，在文本行中输入一段文字并按enter键后，这段文字将显示在标签上

import java.awt.*; import java.awt.event.*;  class three extends Frame implements ActionListener{ static  three frm=new three(); static Label l1=new Label(); static TextField m=new TextField(); public static void main(String[] args) { // TODO Auto-generated method stub frm.setTitle("窗口一"); frm.setSize(500,500); frm.setLayout(new GridLayout(2,2)); l1.setText("标签一"); m.addActionListener(frm); frm.add(l1); frm.add(m); frm.setVisible(true); } public void actionPerformed(ActionEvent e) { l1.setText(m.getText()); } }