错在那里!

public void actionPerformed(ActionEvent click)
  {
  if(click.getActionCommand().equals("添加"))
  {
  JInternalFrame[] frames=desktoppane.getAllFrames();
  Boolean isExisted=Boolean.FALSE;
  for(int i=0;i<frames.length;i++)
  {
  if(frames[i].getName().equals("affair"))
  {
  isExisted=Boolean.TRUE;
  break;
  }
  }
  if(isExisted)
  {
  JOptionPane.showMessageDialog(this.desktoppane,"该事务已打开！","错误提示",JOptionPane.ERROR_MESSAGE);
  }
  else
  {
  addsubject_affair jinternalframe=new addsubject_affair("添加窗口","affair",this.desktoppane,this.jsp);
  this.desktoppane.add(jinternalframe);
 
  int width=(desktoppane.getWidth()-jinternalframe.getWidth())/2;
    int higt=(desktoppane.getHeight()-jinternalframe.getHeight())/2;
    jinternalframe.setLocation(width,higt);
  jinternalframe.setVisible(true);
 
  }
  }
D:\Project\Main\src\AddSubjectJinternal.java:66: incompatible types
found   : java.lang.Boolean
required: boolean
  if(isExisted)
                           ^