一、前言

基于granite源碼包org.granite.util.CollectionUtil集合工具類，分別獲取集合反射類型java.lang.reflect.Type、實例化newCollection各種常用集合序列類集(TreeSet/HashSet/ArrayList/自定義集合等)。

二、源碼說明package?org.granite.util;@b@@b@import?java.lang.reflect.ParameterizedType;@b@import?java.lang.reflect.Type;@b@import?java.util.ArrayList;@b@import?java.util.Collection;@b@import?java.util.HashSet;@b@import?java.util.Set;@b@import?java.util.SortedSet;@b@import?java.util.TreeSet;@b@@b@public?class?CollectionUtil@b@{@b@??public?static?Type?getComponentType(Type?collectionType)@b@??{@b@????Class?collectionClass?=?ClassUtil.classOfType(collectionType);@b@????if?((collectionClass?==?null)?||?(!(Collection.class.isAssignableFrom(collectionClass))))@b@??????return?null;@b@@b@????if?(collectionType?instanceof?ParameterizedType)?{@b@??????Type[]?componentTypes?=?((ParameterizedType)collectionType).getActualTypeArguments();@b@??????if?((componentTypes?!=?null)?&&?(componentTypes.length?==?1))@b@????????return?componentTypes[0];@b@????}@b@@b@????return?Object.class;@b@??}@b@@b@??public?static?Collection?newCollection(Class>?targetClass,?int?length)@b@????throws?InstantiationException,?IllegalAccessException@b@??{@b@????if?(targetClass.isInterface())@b@????{@b@??????if?(Set.class.isAssignableFrom(targetClass))?{@b@????????if?(SortedSet.class.isAssignableFrom(targetClass))@b@??????????return?new?TreeSet();@b@????????return?new?HashSet(length);@b@??????}@b@@b@??????if?(targetClass.isAssignableFrom(ArrayList.class))@b@????????return?new?ArrayList(length);@b@@b@??????throw?new?IllegalArgumentException("Unsupported?collection?interface:?"?+?targetClass);@b@????}@b@@b@????return?((Collection)targetClass.newInstance());@b@??}@b@}

總結

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