Use stringbuilder

Author: ArtDu

src/main/java/io/tarantool/driver/core/TarantoolResultImpl.java

@@ -161,8 +161,6 @@ public List<T> subList(int fromIndex, int toIndex) {
 
     @Override
     public String toString() {
-        return "TarantoolResultImpl{" +
-            "tuples=" + tuples +
-            '}';
+        return new StringBuilder("TarantoolResultImpl{").append("tuples=").append(tuples).append("}").toString();
     }
 }

src/main/java/io/tarantool/driver/core/metadata/TarantoolFieldMetadataImpl.java

@@ -68,11 +68,10 @@ public boolean getIsNullable() {
 
     @Override
     public String toString() {
-        return "TarantoolFieldMetadataImpl{" +
-            "fieldName='" + fieldName + '\'' +
-            ", fieldType='" + fieldType + '\'' +
-            ", fieldPosition=" + fieldPosition +
-            ", isNullable=" + isNullable +
-            '}';
+        return new StringBuilder("TarantoolFieldMetadataImpl{")
+            .append("fieldName='").append(fieldName).append('\'')
+            .append(", fieldType='").append(fieldType).append('\'')
+            .append(", fieldPosition=").append(fieldPosition)
+            .append(", isNullable=").append(isNullable).append('}').toString();
     }
 }

src/main/java/io/tarantool/driver/core/tuple/TarantoolTupleImpl.java

@@ -471,9 +471,8 @@ private void readObject(java.io.ObjectInputStream in) {
 
     @Override
     public String toString() {
-        return "TarantoolTupleImpl{\n" +
-            "\tspaceMetadata=" + spaceMetadata + ",\n" +
-            "\tfields=" + fields + "\n" +
-            "}";
+        return new StringBuilder("TarantoolTupleImpl{\n")
+            .append("\tspaceMetadata=").append(spaceMetadata).append(",\n")
+            .append("\tfields=").append(fields).append("\n}").toString();
     }
 }