Description        Resource        Path        Location        Type
The type java.lang.CharSequence cannot be resolved. It is indirectly referenced from required .class files        Demo2_string.java        /day12/src/com/cc/string        line 11        Java Problem
出现这种问题怎么解决

Description        Resource        Path        Location        Type
The type java.lang.CharSequence cannot be resolved. It is indirectly referenced from required .class files        Demo2_string.java        /day12/src/com/cc/string        line 11        Java Problem
出现这种问题怎么解决