A.Nothingappearsintheapplet.
B.Abuttonwillcoverthewholeareaoftheapplet.
C.Abuttonwillappearinthetopleftcorneroftheapplet.
D.Abuttonwillappear,centeredinthetopregionoftheapplet.
E.Abuttonwillappearinthecenteroftheapplet.
第1题:
阅读下面代码:
import java.awt.*;
public class Exam11_1
{
private Frame. f;
private Button b1,b2,b3,b4;
public static void main(String args[]
{
Exam11_1 that = new Exam11 1 ();
that.go();
}
public void go()
{
______;
f.setLayout(new FlowLayout()) ;;
b1 = new Button ("Button 1");
b2 = new Button ("Button 2");
b3 = new Button ("Button 3");
b4 = new Button ("Button 4");
f.add (b1);
f.add (b2);
f.add (b3);
f.add (b4);
f.pack ();
f.setVisible (true);
}
}
请在程序中画线处填写正确的语句【 】,以便编译运行程序后得到正确的结果。
第2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 bj = 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.obj.setLayout(new BorderLayout());
B.setLayout(new Borderkayout());
C.setLayout(BorderLayout());
D.obj.setLayout(BorderLayout());
第3题:
下列Applet在窗口中放置2个Button,标签分别为“东”和“西”,在窗口中的位置与它们的名字相同。选择正确的语句填入横线处。 import java.awt.*; import java.applet.*; public class ex16 extends Applet { Button e, w; public void init() { e = new Button("东"); w = new Button("西"); add("East", e); add("West", w); } }
A.setLayout(new BoxLayout());
B.setLayout(new FlowLayout());
C.setLayout(new BorderLayout());
D.setLayout(new GridLayout());
第4题:
请将下列程序的空白处补充完整。
Importjava.awt.*;
PublicclassEll_4
{
Publicstaticvoidmain(Stringargs[])
{
Framef=newFrame(“BorderLayout”);
fiadd(“North”,newbuRon(“North”));
f.add(“East”,newbutton(“East”));
f.add(“West”,newbutton(“West”));
f.add(“South”,tf);
f.setSize(200,200)
fipack();
fisetVisible(true);
}
}
第5题:
下列程序采用BorderLayout布局管理,选择正确的语句填入横线处,实现在North区域显示一个名字为“北方”的Button构件。 import java.awt.*; public class ex48 { public static void main(String[] args) { frame. frm = new Frame. ("北方"); frm.setLayout(new BorderLayout()); frm.setSize(200, 200); frm.setVisible(true); } }
A.add("Nouth", new Button("北方"));
B.frm.add("South", new Button("北方"));
C.frm.add("Nouth", new Button("北方"));
D.Frm.add("South", Button("北方"));