Java認證考試章節(jié)練習(2019.04.28)

What is the result？（）

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（）；  
}  
}  

Given：
10.public void service（ServletRequest request，
11.ServletResponse response） {
12.ServletInputStream sis =
13.// insert code here
14.}
Which retrieves the binary input stream on line 13？（）

Squeaky Beans Inc. hired an outside consultant to develop their web application. To finish the job quickly，the consultant created several dozen JSP pages that directly communicate with the database. The Squeakybusiness team has since purchased a set of business objects to model their system， and the Squeaky developer charged with maintaining the web application must now refactor all the JSPs to work with the newsystem.
Which pattern can the developer use to solve this problem？（）

abstract class abstrctIt {  
abstract float getFloat （）；  
}  
public class AbstractTest extends AbstractIt {  
private float f1= 1.0f；  
private float getFloat （） {return f1；}  
}  
What is the result？ （）