单项选择题

A Button is positioned in a Frame. Only height of the Button is affected by the Frame while the width is not. Which layout manager should be used？（）

A. FlowLayout
B. CardLayout
C. North and South of BorderLayout
D. East and West of BorderLayout
E. GridLayout

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单项选择题

class Parent {
String one， two；
public Parent（String a， String b）{
one = a；
two = b； }
public void print（）{ System.out.println（one）； } }
public class Child extends Parent {
public Child（String a， String b）{
super（a，b）；
}
public void print（）{
System.out.println（one + " to " + two）；
}
public static void main（String arg[]）{
Parent p = new Parent（"south"， "north"）；
Parent t = new Child（"east"， "west"）；
p.print（）；
t.print（）；
}
}
Which of the following is correct？（）

A. Cause error during compilation.
B. south east
C. south to north east to west
D. south to north east
E. south east to west

多项选择题

public class Parent {
int change（） {…}
}
class Child extends Parent {
}
Which methods can be added into class Child？（）

A. public int change（）{}
B. int chang（int i）{}
C. private int change（）{}
D. abstract int chang（）{}