BAEL-1309 Append Data to a File with Java (#3054)

* Evaluation article: Different Types of Bean Injection in Spring

* added tests & changed configuration to Java-based config

* removed xml config files

* rename unit tests

* BAEL-972 - Apache Commons Text

* remove code from evaluation article

* remove code from evaluation article

* BAEL-972 - Apache Commons Text - added another example

* BAEL-972 - Apache Commons Text - just indentation

* BAEL-994 - TemporalAdjuster in Java

* BAEL-994 - TemporalAdjuster in Java

* BAEL-994 - TemporalAdjuster in Java

* BAEL-994 - TemporalAdjuster in Java

* BAEL-994 - TemporalAdjuster in Java - fix problems

* BAEL-1033 Introduction to StreamUtils

* BAEL-1033 Introduction to StreamUtils

* BAEL-1033 Introduction to StreamUtils

* fix formatting

* BAEL-1033 minor refactor

* BAEL-1035 Introduction to Eclipse Collections

* format

* BAEL-1035 Introduction to Eclipse Collections

* BAEL-1035 Introduction to Eclipse Collections

* BAEL-1035 Introduction to Eclipse Collections

* cleanup

* cleanup

* BAEL-1109 Introduction to JCache

* BAEL-1109 Introduction to JCache

* remove unneeded property in pom.xml

* fix formatting

* close cache instances properly

* remove latest commit

* BAEL-1057 Introduction to rxjava-jdbc

* refactor rxjava-jdbc

* Refactor rxjava-jdbc

* Refactoring rxjava-jdbc

* BAEL-1171 java.lang.String API

* refactor rxjava-jdbc

* refactor String

* String API - move multiple classes into a single class

* move class into test package

* BAEL-1171 String.lang.String API

* BAEL-1171 java.lang.String API

* BAEL-1250 Initializing Arrays in Java

* BAEL-1250 Initializing Arrays in Java

* BAEL-1250 Initializing Arrays in Java

* small fix

* BAEL-1171 java.lang.String API

* BAEL-1263 Daemon Threads in Java

* merge with fork

* BAEL-1263 Daemon Threads in Java

* fix compilation error

* BAEL-1309 Append Data to a File with Java

* fix build fails

* fix test error

* fix build failures

* cleanup

* fix Sneaky Runnable test

* revert sneaky runnable fix attempt

* fix test failure

* fix test failure

* fix all test failures

* fix test failure

* fix test failures

* Nested Classes in Java

core-java/src/main/java/com/baeldung/nestedclass/Enclosing.java

@@ -0,0 +1,11 @@
+package com.baeldung.nestedclass;
+
+public class Enclosing {
+
+    public static class Nested {
+
+        public void test() {
+            System.out.println("Calling test...");
+        }
+    }
+}

core-java/src/main/java/com/baeldung/nestedclass/NewEnclosing.java

@@ -0,0 +1,15 @@
+package com.baeldung.nestedclass;
+
+public class NewEnclosing {
+
+    void run() {
+        class Local {
+
+            void run() {
+                System.out.println("Welcome to Baeldung!");
+            }
+        }
+        Local local = new Local();
+        local.run();
+    }
+}

core-java/src/main/java/com/baeldung/nestedclass/Outer.java

@@ -0,0 +1,11 @@
+package com.baeldung.nestedclass;
+
+public class Outer {
+
+    public class Inner {
+
+        public void test() {
+            System.out.println("Calling test...");
+        }
+    }
+}

core-java/src/main/java/com/baeldung/nestedclass/SimpleAbstractClass.java

@@ -0,0 +1,5 @@
+package com.baeldung.nestedclass;
+
+abstract class SimpleAbstractClass {
+    abstract void run();
+}

core-java/src/main/java/com/baeldung/util/StreamUtils.java

@@ -0,0 +1,16 @@
+package com.baeldung.util;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.StringWriter;
+
+import org.apache.commons.io.IOUtils;
+
+public class StreamUtils {
+
+    public static String getStringFromInputStream(InputStream input) throws IOException {
+        StringWriter writer = new StringWriter();
+        IOUtils.copy(input, writer, "UTF-8");
+        return writer.toString();
+    }
+}