[单项选择题] 下列程序在Frame中设定BorderLayout布局管理器，选择正确的语句填入程序的横线处。 import java.awt.*; public class ex43 exten

[单项选择题] 下列程序在Frame中设定BorderLayout布局管理器，选择正确的语句填入程序的横线处。 import java.awt.*; public class ex43 extends Frame { public static void main(String[] args) { ex43 obj = new ex43("BorderLayout"); ______ obj.add("North", new Button("North")); obj.add("South", new Button("Sourth")); obj.add("East", new Button ("East")); obj.add("West", new Button ("West")); obj. add ("Center", new Button ( "Center" ) ); obj.pack(); obj. setVisible (true); } public ex43(String str) { super (str); } }

A．obsetLayout(new BorderLayout());

B．setLayout(new Borderkayout());

C．setLayout(BorderLayout());

D．obsetLayout(BorderLayout());