看见你的回答就知道高手 The left-hand side of an assignment must be a variable?dbString schoolingLength = request.getParameter("schooling_length");Double db = Double.parseDouble(schoolingLength);=1){}%>
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![看见你的回答就知道高手 The left-hand side of an assignment must be a variable?dbString schoolingLength = request.getParameter(](/uploads/image/z/12319751-47-1.jpg?t=%E7%9C%8B%E8%A7%81%E4%BD%A0%E7%9A%84%E5%9B%9E%E7%AD%94%E5%B0%B1%E7%9F%A5%E9%81%93%E9%AB%98%E6%89%8B+The+left-hand+side+of+an+assignment+must+be+a+variable%3FdbString+schoolingLength+%3D+request.getParameter%28%22schooling_length%22%29%3BDouble+db+%3D+Double.parseDouble%28schoolingLength%29%3B%3D1%29%7B%7D%25%3E)
看见你的回答就知道高手 The left-hand side of an assignment must be a variable?dbString schoolingLength = request.getParameter("schooling_length");Double db = Double.parseDouble(schoolingLength);=1){}%>
看见你的回答就知道高手 The left-hand side of an assignment must be a variable?db
String schoolingLength = request.getParameter("schooling_length");
Double db = Double.parseDouble(schoolingLength);
=1){
}
%>
看见你的回答就知道高手 The left-hand side of an assignment must be a variable?dbString schoolingLength = request.getParameter("schooling_length");Double db = Double.parseDouble(schoolingLength);=1){}%>
这段程序有问题.
Double.parseDouble(schoolingLength 得到的是一个double变量
而左Double db所赋值的是Double变量,变量类型不一致导致不能赋值.
double是基本数据类型,而Double是封装的对象类型,这是不同的数据类型
你只要把Double db = Double.parseDouble(schoolingLength);改为
double db = Double.parseDouble(schoolingLength);
编译就能通过
我晕.高手来回答吧.我是路过的。