觉得很简单，可为什么总不对，if的问题
String tablename = request.getParameter( "tablename ");
if (tablename == "flhsk ") {
stringSqlString = "select gk as 工卡,mc as 名称,bz as 标志,gg as 规格 from flhsk ";
}
if (tablename == "zbjhb ") {
stringSqlString = "select gk as 工卡,bz as 标志,gg as 规格,dw as 单位 from zbjhb ";
}
if (tablename == "cpysrb ") {
stringSqlString = "select gk as 工卡,cpdh as 产品代号,gg as 规格,js as 件数 from cpysrb ";
}
高手们，tablename的值可以取到，可为什么stringSqlString的值总为null啊？这个if语句难道有问题？好晕啊◎◎
还有，如果人为tablename == "zbjhb "，stringSqlString的值就不为空了，好奇怪啊
[解决办法]
if ( "flhsk ".equals(tablename))
[解决办法]
java 中判断字符串相等不是 == 而是equals这个方法
[解决办法]
"zbjhb ".equals(tablename)
[解决办法]
java 中判断字符串相等不是 == 而是equals这个方法
