public int getSuperClass() {
		return superClass & 0xffff;
	}
For a class, the value of the super_class item either must be zero or
must be a valid index into the constant_pool table. If the value of the
super_class item is nonzero, the constant_pool entry at that index must be
a CONSTANT_Class_info (?4.4.1) structure representing the direct superclass
of the class defined by this class file. Neither the direct superclass nor any of
its superclasses may have the ACC_FINAL flag set in the access_flags item of
its ClassFile structure.
<p>
If the value of the super_class item is zero, then this class file must represent
the class Object, the only class or interface without a direct superclass.
<p>
For an interface, the value of the super_class item must always be a valid
index into the constant_pool table. The constant_pool entry at that index
must be a CONSTANT_Class_info structure representing the class Object.
@return a valid index into the constant_pool table to a CONSTANT_Class_info
Ghidra/Processors/JVM/src/main/java/ghidra/javaclass/format/ClassFileJava.java