fix : add toolkit

hippo4j-common/src/main/java/cn/hippo4j/common/toolkit/MemoryUtil.java

@@ -26,7 +26,7 @@ import java.lang.management.MemoryUsage;
 
 /**
  * memory util<br>
- * the obtained information is not invalid, after a long wait, obtain it again
+ * the obtained information is not real time effective, after a long wait, please get it again
  *
  * @author liuwenhao
  */

hippo4j-common/src/main/java/cn/hippo4j/common/toolkit/ReflectUtil.java

@@ -250,4 +250,18 @@ public class ReflectUtil {
             throw new IllegalException(e);
         }
     }
+
+    /**
+     * get instance
+     *
+     * @param cls the class
+     * @return new Instance
+     */
+    public static Object createInstance(Class<?> cls) {
+        try {
+            return cls.newInstance();
+        } catch (InstantiationException | IllegalAccessException e) {
+            throw new IllegalException(e);
+        }
+    }
 }