看见你的回答就知道高手 The left-hand side of an assignment must be a va

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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?db
String schoolingLength = request.getParameter("schooling_length");
Double db = Double.parseDouble(schoolingLength);
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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

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