优化分页结果包装类的泛型参数

Author: 章福来

src/main/java/com/github/pagehelper/PageInfo.java

@@ -120,7 +120,7 @@ public PageInfo() {
      *
      * @param list
      */
-    public PageInfo(List<T> list) {
+    public PageInfo(List<? extends T> list) {
         this(list, DEFAULT_NAVIGATE_PAGES);
     }
 
@@ -130,7 +130,7 @@ public PageInfo(List<T> list) {
      * @param list          page结果
      * @param navigatePages 页码数量
      */
-    public PageInfo(List<T> list, int navigatePages) {
+    public PageInfo(List<? extends T> list, int navigatePages) {
         super(list);
         if (list instanceof Page) {
             Page page = (Page) list;
@@ -162,11 +162,11 @@ public PageInfo(List<T> list, int navigatePages) {
         }
     }
 
-    public static <T> PageInfo<T> of(List<T> list) {
+    public static <T> PageInfo<T> of(List<? extends T> list) {
         return new PageInfo<T>(list);
     }
 
-    public static <T> PageInfo<T> of(List<T> list, int navigatePages) {
+    public static <T> PageInfo<T> of(List<? extends T> list, int navigatePages) {
         return new PageInfo<T>(list, navigatePages);
     }
 

src/main/java/com/github/pagehelper/PageSerializable.java

@@ -40,16 +40,17 @@ public class PageSerializable<T> implements Serializable {
     public PageSerializable() {
     }
 
-    public PageSerializable(List<T> list) {
-        this.list = list;
+    @SuppressWarnings("unchecked")
+    public PageSerializable(List<? extends T> list) {
+        this.list = (List<T>) list;
         if(list instanceof Page){
-            this.total = ((Page)list).getTotal();
+            this.total = ((Page<?>)list).getTotal();
         } else {
             this.total = list.size();
         }
     }
 
-    public static <T> PageSerializable<T> of(List<T> list){
+    public static <T> PageSerializable<T> of(List<? extends T> list){
         return new PageSerializable<T>(list);
     }