阅读以下代码，并将空处填写完整。import java.io.*;public class Test1 {public static void main(String args[])throws Exception{int a=4;BufferedReader br=new BufferedReader(new (System.in));System.out.println("请输入一个数字");String input= ;int b=Integer.parseInt(input);if(b>a){int sum=b/a;System.out.println(sum);}else{System.out.println("输入错误");}}}

以下创建RandomAccessFile类实例对象的代码，哪些是正确的？

A. RandomAccessFile(new File(“D:\\dir1\\test.java”),”rw”)
B. RandomAccessFile( “D:\\dir1\\test.java”,”r”)
C. RandomAccessFile( “D:\\dir1\\test.java”)
D. RandomAccessFile( “D:\\dir1\\test.java”,”wr”)