It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import.
import crafttweaker.entity.AttributeInstance;

ZenGetter	GetterMethod	返回值类型
ZenGetter attribute	GetterMethod getAttribute()	返回值类型 IEntityAttribute
ZenGetter baseValue	GetterMethod getBaseValue()	返回值类型 double
ZenGetter modifiers	GetterMethod getModifiers()	返回值类型 List<IEntityAttrubuteModifier>
ZenGetter attributeValue	GetterMethod getAttributeValue()	返回值类型 double

ZenSetter	SetterMethod	参数类型
ZenSetter baseValue	SetterMethod setBaseValue(value)	参数类型 double

• List<IEntityAttrubuteModifier> getModifiersByOperation(int operation)
• boolean hasModifier(IEntityAttributeModifier modifier)
• IEntityAttributeModifier getModifier(String uuid);
• void applyModifier(IEntityAttributeModifier modifier);
• void removeModifier(IEntityAttributeModifier modifier);
• void removeModifier(String uuid);
• void removeAllModifiers();