A Button is position...

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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1.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

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2.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（）{}

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3.多项选择题Which of the following statements are legal？（）

A. long l = 4990；
B. int i = 4L；
C. float f = 1.1；
D. double d = 34.4；
E. double t = 0.9F；

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4.多项选择题 String s= "hello"；
String t = "hello"；
char c[] = {’h’，’e’，’l’，’l’，’o’} ；
Which return true？（）

A. s.equals（t）；
B. t.equals（c）；
C. s==t；
D. t.equals（new String（"hello"））；
E. t==c；

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5.单项选择题Which expressions are correct to declare an array of 10 String objects？（）

A. char str[]；
B. char str[][]；
C. String str[]；
D. String str[10]；

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6.单项选择题A public member vairable called MAX_LENGTH which is int type， the value of the variable remains constant value 100. Use a short statement to define the variable.（）

A. public int MAX_LENGTH=100；
B. final int MAX_LENGTH=100；
C. final public int MAX_LENGTH=100；
D. public final int MAX_LENGTH=100；

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7.单项选择题A member variable defined in a class can be accessed only by the classes in the same package. Which modifier should be used to obtain the access control？（）

A. private
B. no modifier
C. public
D. protected

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8.多项选择题 public class Parent {
public int addValue（ int a， int b） {
int s；
s = a+b；
return s；
}
}
class Child extends Parent {
}
Which methods can be added into class Child？（）

A. int addValue（ int a， int b ）{// do something...}
B. public void addValue （）{// do something...}
C. public int addValue（ int a ）{// do something...}
D. public int addValue（ int a， int b ）throws MyException {//do something...}

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9.单项选择题 Given the following code：
public class Person{
int arr[] = new int[10]；
public static void main（String a[]） {
System.out.println（arr[1]）；
}
}
Which statement is correct？（）

A. When compilation some error will occur.
B. It is correct when compilation but will cause error when running.
C. The output is zero.
D. The output is null.

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10.单项选择题 Given the following code：
public class Person{ static int arr[] = new int[10]；
public static void main（String a[]） {
System.out.println（arr[1]；）
}
}
Which statement is correct？（）

A. When compilation some error will occur.
B. It is correct when compilation but will cause error when running.
C. The output is zero.
D. The output is null.

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