Lambdas and Local Variable

Author: spdpiyush

Modern-Java-Examples/src/com/learn/lambdas/LambdaVariable1.java

@@ -0,0 +1,46 @@
+package com.learn.lambdas;
+
+import java.util.function.Consumer;
+
+public class LambdaVariable1 {
+
+    private static int num = 10;
+
+    public static void main(String[] args) {
+
+        int  i = 10; // local Variable
+
+        /**
+         * we can't use the same variable which is
+         * already defined in this method scope.
+         */
+        Consumer<Integer> consumer1 = (i1) -> {
+            System.out.println(i1);
+        };
+
+
+        int value = 5;
+        /**
+         * we are not allowed to modify any local variables
+         * that is being referenced in lambda scope.
+         */
+        Consumer<Integer> consumer2 = (i1) -> {
+            //i = 10;  ( Not allowed )
+            System.out.println(i1 + value);
+        };
+
+        // value = 5; even we can't do this. since it is referenced in lambda scope.
+
+
+        /**
+         * For Instance Variables or Class Variables,
+         * there is no restriction.
+         */
+        Consumer<Integer> consumer3 = (i1) -> {
+            num = 5;
+            System.out.println(i1 + num);
+        };
+
+        num = 2;
+    }
+}

README.md

@@ -20,6 +20,7 @@ This repository contains the basic & advance level examples related to Java
     * [Consumer Method Reference](Modern-Java-Examples/src/com/learn/methodreference/ConsumerMethodReferenceExample.java)
     * [Refactoring Method Reference](Modern-Java-Examples/src/com/learn/methodreference/RefactorMethodReferenceExample.java)
   * [Constructor Reference](Modern-Java-Examples/src/com/learn/constructorreference/ConstructorReferenceExample.java)
+  * [Lambdas and Local Variables](Modern-Java-Examples/src/com/learn/lambdas/LambdaVariable1.java)