单选题What will be written to the standard output when the following program is run?()   public class Q03e4 {   public static void main(String args[]) {   String space = " ";   String composite = space + "hello" + space + space;   composite.concat("world"); 

题目
单选题
What will be written to the standard output when the following program is run?()   public class Q03e4 {   public static void main(String args[]) {   String space = " ";   String composite = space + "hello" + space + space;   composite.concat("world");   String trimmed = composite.trim();   System.out.println(trimmed.length());   }   }
A

5

B

6

C

7

D

12

E

13


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参考答案和解析
正确答案: E
解析: 暂无解析