添加 @FunctionalInterface 注解

src/main/java/com/jfinal/json/IJsonFactory.java

@@ -19,6 +19,7 @@ package com.jfinal.json;
 /**
  * IJsonFactory.
  */
+@FunctionalInterface
 public interface IJsonFactory {
 	Json getJson();
 }

src/main/java/com/jfinal/plugin/activerecord/IAtom.java

@@ -30,6 +30,7 @@ import java.sql.SQLException;
  * 			return result1 == 1 && result2 == 1;<br>
  * 		}});
  */
+@FunctionalInterface
 public interface IAtom {
 	
 	/**

src/main/java/com/jfinal/plugin/activerecord/ICallback.java

@@ -22,6 +22,7 @@ import java.sql.SQLException;
 /**
  * ICallback provide a JDBC Connection if you need it or the active record plugin can not satisfy you requirement.
  */
+@FunctionalInterface
 public interface ICallback {
 	
 	/**

src/main/java/com/jfinal/plugin/activerecord/IDbProFactory.java

@@ -26,6 +26,7 @@ package com.jfinal.plugin.activerecord;
  * 
  * 注意：每个 ActiveRecordPlugin 对象拥有独立的 IDbProFactory 对象，多数据源使用时注意要对每个 arp 进行配置
  */
+@FunctionalInterface
 public interface IDbProFactory {
 	
 	DbPro getDbPro(String configName);

src/main/java/com/jfinal/plugin/druid/IDruidStatViewAuth.java

@@ -21,6 +21,7 @@ import javax.servlet.http.HttpServletRequest;
 /**
  * 授权
  */
+@FunctionalInterface
 public interface IDruidStatViewAuth {
 	boolean isPermitted(HttpServletRequest request);
 }

src/main/java/com/jfinal/plugin/ehcache/IDataLoader.java

@@ -27,6 +27,7 @@ package com.jfinal.plugin.ehcache;
  * }});
  * </pre>
  */
+@FunctionalInterface
 public interface IDataLoader {
 	public Object load();
 }

src/main/java/com/jfinal/plugin/redis/ICallback.java

@@ -21,6 +21,7 @@ package com.jfinal.plugin.redis;
  * 将多个 redis 操作放在同一个redis连下中使用，另外也可以让同一个
  * Cache 对象使用 select(int) 方法临时切换数据库
  */
+@FunctionalInterface
 public interface ICallback {
 	<T> T call(Cache cache);
 }

src/main/java/com/jfinal/plugin/redis/IKeyNamingPolicy.java

@@ -22,6 +22,7 @@ package com.jfinal.plugin.redis;
  * 例如 Integer、String、OtherType 这些不同类型的对象
  * 选择不同的命名方式，默认命名方式是  Object.toString()
  */
+@FunctionalInterface
 public interface IKeyNamingPolicy {
 	
 	String getKeyName(Object key);

src/main/java/com/jfinal/template/source/ISourceFactory.java

@@ -25,6 +25,7 @@ package com.jfinal.template.source;
  * 配置示例：
  * engine.setSourceFactory(new ClassPathSourceFactory());
  */
+@FunctionalInterface
 public interface ISourceFactory {
 	ISource getSource(String baseTemplatePath, String fileName, String encoding);
 }