单项选择题

You want subclasses in any package to have access to members of a superclass. Which is the most restrictive access modifier that will accomplish this objective？（）

A. Public
B. Private
C. Protected
D. Transient
E. No access modifier is qualified.

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单项选择题

Which will declare a method that forces a subclass to implement it？（）

A. Public double methoda（）；
B. Static void methoda （double d1） {}
C. Public native double methoda（）；
D. Abstract public void methoda（）；
E. Protected void methoda （double d1）{}

单项选择题

public class foo {
public static void main （String[]args） {
String s；
system.out.printIn （“s=” + s）；
}
}
What is the result？（）

A. The code compiles and “s=” is printed.
B. The code compiles and “s=null” is printed.
C. The code does not compile because string s is not initialized.
D. The code does not compile because string s cannot be referenced.
E. The code compiles， but a NullPointerException is thrown when toString is called.

单项选择题

int index = 1；
int [] foo = new int [3]；
int bar = foo [index]；
int baz = bar + index；
What is the result？（）

A. Baz has the value of 0
B. Baz has the value of 1
C. Baz has the value of 2
D. An exception is thrown.
E. The code will not compile.