Add Lamda Expressions and Anonymous Classes

Author: Hardvan

23_Lambda_Expressions_and_Anonymous_Classes/LambdaExpressions_and_AnonymousClasses.java

@@ -0,0 +1,79 @@
+// ? Lambda Expressions
+// * Let us express instances of single method interfaces with lambda expressions
+// * Lambda expressions are anonymous functions
+
+// ? Anonymous Classes
+// * Used to implement a base class without giving it a name.
+
+interfaceDemoAno{
+voidmeth1();
+
+voidmeth2();
+}
+
+interfaceDemoAno2{
+voidmeth1();
+}
+
+interfaceDemoAno3{
+voidmeth1(inta);
+}
+
+classAnonymousClassimplementsDemoAno{
+
+publicvoiddisplay(){
+System.out.println("Anonymous Class");
+ }
+
+@Override
+publicvoidmeth1(){
+System.out.println("I am meth1");
+ }
+
+@Override
+publicvoidmeth2(){
+System.out.println("I am meth2");
+ }
+
+}
+
+publicclassLambdaExpressions_and_AnonymousClasses{
+
+publicstaticvoidmain(String[] args){
+
+// AnonymousClass ano = new AnonymousClass(); // Normal way
+// ano.display();
+// ano.meth1();
+// ano.meth2();
+
+DemoAnoobj = newDemoAno(){// Anonymous Class
+
+@Override
+publicvoidmeth1(){
+System.out.println("I am meth1");
+ }
+
+@Override
+publicvoidmeth2(){
+System.out.println("I am meth2");
+ }
+ };
+obj.meth1();
+obj.meth2();
+
+// Lambda Expressions
+
+// No parameters
+DemoAno2obj2 = () ->{// Only for single method interfaces (functional interfaces)
+System.out.println("I am meth1");
+ };
+obj2.meth1();
+
+// With parameters
+DemoAno3obj3 = (a) ->{
+System.out.println("I am meth1" + a);
+ };
+obj3.meth1(5);
+
+ }
+}