Web开发语言：Java 框架：ssm JDK版本：JDK1.8 服务器：tomcat7 数据库：mysql 5.7（一定要5.7版本） 数据库工具：Navicat11 开发软件 ... WebIn Java SE 7, you can substitute the parameterized type of the constructor with an empty set of type parameters ( <> ): Map> myMap = new HashMap<> (); Note that to take advantage of automatic type inference during generic class instantiation, you must specify the diamond.
HashMap put() Method in Java - GeeksforGeeks
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Tanvir Ahamed, Ph.D. - Operations Research Engineer - LinkedIn
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