下面的代码1和2处各输出什么?具体说明一下理由?

publicclasstest{

x05

x05publicstaticvoidmethod(finalStringBufferparam){

x05x05param.append("change");

x05x05System.out.println(param.toString());//1

x05x05

x05x05StringBufferparam=newStringBuffer();

x05x05param.append("asd");

x05x05System.out.println(param.toString());//2

x05}

}