mpl.add(new MenuItem("DDA画线"))

　　 mpl.add(new MenuItem("中点画线"))

　　 mpl.add(new MenuItem("Bresenham画线"))

　　 mpl.addActionListener(this)

　　 mp2=new Menu("画圆")

　　 mp.add(mp2)

　　 mp2.add(new MenuItem("公式法画圆"))

　　 mp2.add(new MenuItem("多边形逼近圆"))

　　 mp2.add(new MenuItem("中点画圆"))

　　 mp2.addActionListener(this) -mpl.add (new MenuItem (　DDA line drawing )) mpl.add (new MenuItem (　in the line stipple )) mpl.add (new MenuItem (　Bresenham line drawing )) mpl.addActionListener (this) mp2 = new Menu (　Circle ) mp.add (mp2) mp2.add (new MenuItem (　drawcircle formula )) mp2.add (new MenuItem (　Polygon approximation circle )) mp2.add (new MenuItem (　midpoint drawcircle )) mp2.addActionListener (this)