Java switch 语句如何使用 String 参数

switch (ctrType) {
case "01" : 
exceptionType = "读FC参数数据";
break;
case "03" :
exceptionType = "读FC保存的当前表计数据";
break;
default:
exceptionType = "未知控制码："+ctrType;
}

Cannot switch on a value of type String for source level below 1.7. Only convertible int values or enum variables are permitted

<plugins>
...
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.2</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
...
</plugins>