concurrent test

whatsmars-common/src/test/java/org/hongxi/java/util/concurrent/DaemonThreadTest.java

+package org.hongxi.java.util.concurrent;
+
+/**
+ * Created by shenhongxi on 2019-08-31.
+ */
+public class DaemonThreadTest {
+
+    public static void main(String[] args) {
+        Thread thread = new Thread(() -> {
+            for (;;) {}
+        });
+        thread.setDaemon(true);
+        thread.start();
+        System.out.println("main thread is over");
+    }
+}

whatsmars-common/src/test/java/org/hongxi/java/util/concurrent/DeadLockTest2.java

+package org.hongxi.java.util.concurrent;
+
+/**
+ * Created by shenhongxi on 2019-08-31.
+ */
+public class DeadLockTest2 {
+
+    private static Object resourceA = new Object();
+    private static Object resourceB = new Object();
+
+    public static void main(String[] args) {
+        Thread threadA = new Thread(() -> {
+           synchronized (resourceA) {
+               System.out.println(Thread.currentThread() + " get ResourceA");
+
+               try {
+                   Thread.sleep(1000);
+               } catch (InterruptedException e) {
+                   e.printStackTrace();
+               }
+
+               System.out.println(Thread.currentThread() + "waiting get ResourceB");
+               synchronized (resourceB) {
+                   System.out.println(Thread.currentThread() + " get ResourceB");
+               }
+           }
+        });
+
+        Thread threadB = new Thread(() -> {
+            synchronized (resourceB) {
+                System.out.println(Thread.currentThread() + " get ResourceB");
+
+                try {
+                    Thread.sleep(1000);
+                } catch (InterruptedException e) {
+                    e.printStackTrace();
+                }
+
+                System.out.println(Thread.currentThread() + "waiting get ResourceA");
+                synchronized (resourceA) {
+                    System.out.println(Thread.currentThread() + " get ResourceA");
+                }
+            }
+        });
+
+        threadA.start();
+        threadB.start();
+    }
+}

whatsmars-common/src/test/java/org/hongxi/java/util/concurrent/ThreadLocalTest.java

+package org.hongxi.java.util.concurrent;
+
+/**
+ * Created by shenhongxi on 2019-08-31.
+ */
+public class ThreadLocalTest {
+
+    static ThreadLocal<String> threadLocal = new InheritableThreadLocal<>();
+
+    public static void main(String[] args) {
+        threadLocal.set("hello world");
+
+        new Thread(() -> System.out.println("thread:" + threadLocal.get())).start();
+
+        System.out.println("main:" + threadLocal.get());
+    }
+}