Replace string concatenations with String.format (#3201)

* Define beans for handling different message types in a lean chat app

* Add class based spring beans configuration

* Define spring configuration in XML for constructor based bean injection

* Refactor package structure to separate constructor based bean injection code set from setter based bean injection code set

* Define configuration and classes specific to setter-based bean injection.

* Implement tests for constructor-based and setter-based bean injections

* develop codes for explaining type erasure

* Write unit tests for type erasure examples

* Remove evaluation article code

* Modify type erasure examples and unit tests

* Modify type erasure examples and unit tests

* Add expected exception in TypeErasureUnitTest

* Correct grammar in class name

* Implement File Manager app to demonstrate Polymorphism. Develop unit tests for Polymorphism article code

* Add examples for static polymorphism

* Change sysout statments to slf4j log info statements

* Add assertions and expected errors check on Test

* Add assertions and expected errors check on Test

* Correct compile time error of symbol not found

* Removed commented out non-compiling test.

* Replace string concatenations with String.format

* Replace string concatenations with String.format

core-java/src/test/java/com/baeldung/polymorphism/PolymorphismUnitTest.java

@@ -3,8 +3,6 @@ package com.baeldung.polymorphism;
 import static org.junit.Assert.*;
 
 import java.awt.image.BufferedImage;
-
-import org.junit.Ignore;
 import org.junit.Test;
 
 public class PolymorphismUnitTest {