字符串拼接

String sum ="" ;
for(int j=0;j<list.size();j++){
	typeGoods=(TypeGoods) list.get(j); 
	String id=typeGoods.getTypeid();
	sum+=id+",";
}
sum =sum.substring(0, sum.length())


StringBuffer str = new StringBuffer();
	mdid = data.getMdIdErpData("local");
	for(int h = 0; h < mdid.size() ; h++){
		str.append(mdid.get(h).getMd_id());
		str.append(",");
	}
String str1=str.toString();
str1=str.substring(0, str1.length()-1);
//md_id.substring(1,md_id.lastIndexOf(","));