Syntax error, type annotations are available only when source level is at least 1.8
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今天在编程时遇到这个问题，于是在网上一顿搜索，但都没有解决我的这个问题，网上的解决方案大致如下：
解决办法：Project->Properties->Java Compiler->Compiler Compliance Level选择5.0或者以上的jdk版本
然并卵啊，也许能解决其他人碰到的问题，但是对我来说不适用，最终我了编译错误的第二行信息：
Invalid escape sequence (valid ones are \b \t \n \f \r \" \' \\ )
这是我才恍然大悟，原来是我初始化String变量的字符串中含有"\"字符，由于字符串太长，刚开始没注意看，将"\"字符进行转义后(变成"\\")编译就通过了！！！
纪念不一样的青春~~~
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