Nested Classes in Java

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

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+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

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+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

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+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

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+package com.baeldung.nestedclass;
+
+abstract class SimpleAbstractClass {
+    abstract void run();
+}