第163題

Given:
1. public class TestString3{
2. public static void main(String[] args){
3. //insert code here
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");

答案：BE
參考：11-2 文字類型
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A. 字串不能用減號
C. 字串沒有delete
D. 字串沒有delete