Usage of API documented as @since 1.6+

报错:即方法是Java1.6才开始有的

File ->Project Structure->Project Settings -> Modules -> Language Level->选一个，如8，如7都可以

或者在pom.xml 添加：

<build>  
    <plugins>  
        <plugin>  
            <groupId>org.apache.maven.plugins</groupId>  
            <artifactId>maven-compiler-plugin</artifactId>  
            <version>3.6.0</version>  
            <configuration>  
                <source>1.8</source>  
                <target>1.8</target>  
            </configuration>  
        </plugin>  
    </plugins>  
</build>