diff --git a/modules/java/generator/src/java/org/opencv/utils/Converters.java b/modules/java/generator/src/java/org/opencv/utils/Converters.java
index 94675da183..35beecbc4b 100644
--- a/modules/java/generator/src/java/org/opencv/utils/Converters.java
+++ b/modules/java/generator/src/java/org/opencv/utils/Converters.java
@@ -519,8 +519,7 @@ public class Converters {
         Mat res;
         int lCount = (pts != null) ? pts.size() : 0;
         if (lCount > 0) {
-            for (MatOfPoint vpt : pts)
-                mats.add(vpt);
+            mats.addAll(pts);
             res = vector_Mat_to_Mat(mats);
         } else {
             res = new Mat();
@@ -568,8 +567,7 @@ public class Converters {
         Mat res;
         int lCount = (pts != null) ? pts.size() : 0;
         if (lCount > 0) {
-            for (MatOfPoint2f vpt : pts)
-                mats.add(vpt);
+            mats.addAll(pts);
             res = vector_Mat_to_Mat(mats);
         } else {
             res = new Mat();
@@ -600,8 +598,7 @@ public class Converters {
         Mat res;
         int lCount = (pts != null) ? pts.size() : 0;
         if (lCount > 0) {
-            for (MatOfPoint3f vpt : pts)
-                mats.add(vpt);
+            mats.addAll(pts);
             res = vector_Mat_to_Mat(mats);
         } else {
             res = new Mat();
@@ -614,8 +611,7 @@ public class Converters {
         Mat res;
         int lCount = (kps != null) ? kps.size() : 0;
         if (lCount > 0) {
-            for (MatOfKeyPoint vkp : kps)
-                mats.add(vkp);
+            mats.addAll(kps);
             res = vector_Mat_to_Mat(mats);
         } else {
             res = new Mat();
@@ -714,8 +710,7 @@ public class Converters {
         Mat res;
         int lCount = (lvdm != null) ? lvdm.size() : 0;
         if (lCount > 0) {
-            for (MatOfDMatch vdm : lvdm)
-                mats.add(vdm);
+            mats.addAll(lvdm);
             res = vector_Mat_to_Mat(mats);
         } else {
             res = new Mat();
@@ -746,8 +741,7 @@ public class Converters {
         Mat res;
         int lCount = (lvb != null) ? lvb.size() : 0;
         if (lCount > 0) {
-            for (MatOfByte vb : lvb)
-                mats.add(vb);
+            mats.addAll(lvb);
             res = vector_Mat_to_Mat(mats);
         } else {
             res = new Mat();