这道题答案为什么是"a=123123，b=456"呢？

Question

public static void main(String[]args)
{  
    StringBuffer a = new StringBuffer("123");
    StringBuffer b = new StringBuffer("456");

    test(a ,b);
    System.out.println(a);
    System.out.println(b);
}

static void test(StringBuffer a,StringBuffer b)
{

    a.append("123");
    b=a;
}

Answer 1

http://www.iteye.com/topic/357506 同类的问题