QUESTION 48

QUESTION 48 
Given: 
 
1. public class TestString3 { 
2.     public static void main(String[] args) { 
3. //        insert code here 
4.  
5.         System.out.println(s); 
6.     } 
7. } 
 
 
Which two code fragments, inserted independently at line 3, generate the output 4247? (Choose two.) 
 
A. String s = "123456789"; s = (s-"123").replace(1,3,"24") - "89"; 
B. StringBuffer s = new StringBuffer("123456789"); s.delete(0,3).replace(1,3,"24").delete(4,6); 
C. StringBuffer s = new StringBuffer("123456789"); s.substring(3,6).delete(1,3).insert(1, "24"); 
D. StringBuilder s = new StringBuilder("123456789"); s.substring(3,6).delete(1,2).insert(1, "24"); 
E. StringBuilder s = new StringBuilder("123456789"); s.delete(0,3).delete(1,3).delete(2,5).insert(1, "24"); 
Solution : BE

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plus imformation 

StringBuffer Delete : delete(a,b) --> a~b-1 까지 삭제

StringBuffer replace : replace(a,b,"replace") --> a~b-1 index값을 replace로 바꾼다.