加入监听
然后new Frame2();
=================
  jButton1.addActionListener(new Frame4_jButton1_actionAdapter(this));class Frame4_jButton1_actionAdapter implements java.awt.event.ActionListener {
  Frame4 adaptee;  Frame4_jButton1_actionAdapter(Frame4 adaptee) {
    this.adaptee = adaptee;
  }
  public void actionPerformed(ActionEvent e) {
    adaptee.jButton1_actionPerformed(e);
  }
}
 void jButton1_actionPerformed(ActionEvent e) {
//your code!
  }