单选题What will be written to the standard output when the following program is run？（） class Base { int i； Base（） { add（1）； } void add（int v） { i += v； } void print（） { System.out.println（i）； } } class Extension extends Base { Extension（） { add（2）； } void add（int v） { i += v*2； } } public class Qd073 { public static void main（String args[]） { bogo（new Extension（））； } static void bogo（Base b） { b.add（8）； b.print（）； } }A9B18C20D21E22
单选题
What will be written to the standard output when the following program is run？（） class Base { int i； Base（） { add（1）； } void add（int v） { i += v； } void print（） { System.out.println（i）； } } class Extension extends Base { Extension（） { add（2）； } void add（int v） { i += v*2； } } public class Qd073 { public static void main（String args[]） { bogo（new Extension（））； } static void bogo（Base b） { b.add（8）； b.print（）； } }
A
9
B
18
C
20
D
21
E
22
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