first commit

src/ThreadLocalDemo.java

@@ -0,0 +1,42 @@
+public class ThreadLocalDemo {
+
+    public ThreadLocal<Integer> localVar = new ThreadLocal<>();
+    private Integer integer = 0;
+
+    public void add() {
+        integer = integer + 1;
+    }
+
+    public int get() {
+        return  integer;
+    }
+
+    public static void main(String[] args) {
+        ThreadLocalDemo threadLocalDemo = new ThreadLocalDemo();
+
+        threadLocalDemo.localVar.set(threadLocalDemo.integer);
+
+        Thread t1 = new Thread(threadLocalDemo::add, "t1");
+
+        Thread t2 = new Thread( () -> {
+            threadLocalDemo.add();
+            threadLocalDemo.localVar.set(threadLocalDemo.get());
+            System.out.println("value in new thread: " + threadLocalDemo.get());
+            System.out.println("value in new thread localVar: " + threadLocalDemo.localVar.get());
+        }, "t2");
+
+        t1.start();
+        t2.start();
+
+        try {
+            t1.join();
+            System.out.println("value in main thread: " + threadLocalDemo.get());
+            System.out.println("value in main thread localVar: " + threadLocalDemo.localVar.get());
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+
+
+}