在运行项目时，出现如下错误
Exception in thread "main" java.lang.UnsupportedClassVersionError: shapes/MyPic has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0
查看错误信息，原来是因为编译环境的改变造成的
解决办法：
将项目的编译环境设置成当前的JDK版本即可
步骤：
1. 右键项目—>Properties—> java Compiler–>Compiler Compliance level
2. 选择自己安装的当前的JDK环境即可
