一道面试题分享
最后的运行结果是()
public class Demo {
public static void main(String[] args) {
StringBuilder a = new StringBuilder("a");
StringBuilder b = new StringBuilder("b");
set(a,b);
System.out.println(a+","+b);
}
public static void set(StringBuilder a , StringBuilder b ){
a.append(b);
b = a;
}
}
A:a,b
B:ab,b
C:ab,ab
D:a,ab
运行结果为:ab,b
答案:B