如何使用键盘响应事件！

Question

if(keyEvent.getID()==KeyEvent.KEY_ENTER)
{
  j2.setText(j1.getText);
}

Answer 1

j1.addKeyListener( new KeyAdapter(){
   public void keyPressed(KeyEvent e) {
      if (e.getKeyChar() == KeyEvent.VK_ENTER) {
        String str = j1.getText();
         if(str==null)
             j2.setText("");
         else
             j2.setText(str );
      }
             
   }
})