diff --git a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothBeurerBF700_800.java b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothBeurerBF700_800.java
index d718274a..1b86e6e1 100644
--- a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothBeurerBF700_800.java
+++ b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothBeurerBF700_800.java
@@ -128,11 +128,12 @@ public class BluetoothBeurerBF700_800 extends BluetoothCommunication {
 
     @Override
     public boolean checkDeviceName(String btDeviceName) {
-        if (btDeviceName.toLowerCase().startsWith(new String("BEURER BF700").toLowerCase()) ||
-                btDeviceName.toLowerCase().startsWith(new String("BEURER BF800").toLowerCase())||
-                btDeviceName.toLowerCase().startsWith(new String("BF-800").toLowerCase())||
-                btDeviceName.toLowerCase().startsWith(new String("BF-700").toLowerCase())||
-                btDeviceName.toLowerCase().startsWith(new String("RT-Libra-B").toLowerCase())) {
+        String name = btDeviceName.toLowerCase();
+        if (name.startsWith("BEURER BF700".toLowerCase())
+                || name.startsWith("BEURER BF800".toLowerCase())
+                || name.startsWith("BF-800".toLowerCase())
+                || name.startsWith("BF-700".toLowerCase())
+                || name.startsWith("RT-Libra-B".toLowerCase())) {
             return true;
         }
 
diff --git a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothCommunication.java b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothCommunication.java
index ce08f44c..95d81fdc 100644
--- a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothCommunication.java
+++ b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothCommunication.java
@@ -382,7 +382,7 @@ public abstract class BluetoothCommunication {
     protected String byteInHex(byte[] data) {
         if (data == null) {
             Log.e("BluetoothCommunication", "Data is null");
-            return new String();
+            return "";
         }
 
         final StringBuilder stringBuilder = new StringBuilder(data.length);
diff --git a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothSanitasSbf70.java b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothSanitasSbf70.java
index fd06df16..ca365abb 100644
--- a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothSanitasSbf70.java
+++ b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothSanitasSbf70.java
@@ -126,7 +126,8 @@ public class BluetoothSanitasSbf70 extends BluetoothCommunication {
     @Override
     public boolean checkDeviceName(String btDeviceName) {
         // SilverCrest SBF75 (also known as HealthForYou by SilverCrest)
-        if (btDeviceName.toLowerCase().startsWith(new String("SANITAS SBF70").toLowerCase()) || btDeviceName.toLowerCase().startsWith("sbf75")) {
+        String name = btDeviceName.toLowerCase();
+        if (name.startsWith("SANITAS SBF70".toLowerCase()) || name.startsWith("sbf75")) {
             return true;
         }
 
diff --git a/android_app/app/src/main/java/com/health/openscale/core/datatypes/ScaleMeasurement.java b/android_app/app/src/main/java/com/health/openscale/core/datatypes/ScaleMeasurement.java
index 07154319..e6d88989 100644
--- a/android_app/app/src/main/java/com/health/openscale/core/datatypes/ScaleMeasurement.java
+++ b/android_app/app/src/main/java/com/health/openscale/core/datatypes/ScaleMeasurement.java
@@ -89,7 +89,7 @@ public class ScaleMeasurement implements Cloneable {
         bone = 0.0f;
         waist = 0.0f;
         hip = 0.0f;
-        comment = new String();
+        comment = "";
     }
 
     @Override
diff --git a/android_app/app/src/main/java/com/health/openscale/core/datatypes/ScaleUser.java b/android_app/app/src/main/java/com/health/openscale/core/datatypes/ScaleUser.java
index b5d28f8b..fcb5e291 100644
--- a/android_app/app/src/main/java/com/health/openscale/core/datatypes/ScaleUser.java
+++ b/android_app/app/src/main/java/com/health/openscale/core/datatypes/ScaleUser.java
@@ -52,7 +52,7 @@ public class ScaleUser {
     private Date goalDate;
 
     public ScaleUser() {
-        userName = new String();
+        userName = "";
         birthday = new Date();
         bodyHeight = -1;
         scaleUnit = Converters.WeightUnit.KG;