單項(xiàng)選擇題

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）{}

你可能感興趣的試題

單項(xiàng)選擇題

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.

單項(xiàng)選擇題

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.

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

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

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

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

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

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