public int getClassIndex() {
		return classIndex & 0xffff;
	}
The value of the class_index item must be a valid index into the
constant_pool table. The constant_pool entry at that index must be a
CONSTANT_Class_info structure representing a class or interface type
that has the field or method as a member.
<p>
The class_index item of a CONSTANT_Methodref_info structure must be a
class type, not an interface type.
<p>
The class_index item of a CONSTANT_InterfaceMethodref_info structure
must be an interface type.
<p>
The class_index item of a CONSTANT_Fieldref_info structure may be either
a class type or an interface type.

@return a valid index into the constant_pool table
Ghidra/Processors/JVM/src/main/java/ghidra/javaclass/format/constantpool/AbstractConstantPoolReferenceInfo.java