thread local

code/src/main/java/com/raorao/Test.java

@@ -0,0 +1,31 @@
+package com.raorao;
+
+/**
+ * .
+ *
+ * @author Xiong Raorao
+ * @since 2018-08-02-16:46
+ */
+public class Test {
+
+  private int a;
+
+  public static void main(String[] args) {
+    //System.out.println(foo());
+    int r = new Test().foo();
+    System.out.println(r);
+  }
+
+  public int foo() {
+    try {
+      System.out.println("sadfasdfasdf");
+      return a;
+    } catch (Exception e) {
+      e.printStackTrace();
+      return 3;
+    } finally {
+      System.out.println("finally: " + ++a);
+      return a;
+    }
+  }
+}

code/src/main/java/com/raorao/java/thread/ThreadLocalTest.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2018.  Xiong Raorao. All rights reserved.
+ * Project Name: book-notes
+ * File Name: Test.java
+ * Date: 18-7-25 下午5:32
+ * Author: Xiong Raorao
+ */
+
+package com.raorao.java.thread;
+
+/**
+ * .
+ *
+ * @author Xiong Raorao
+ * @since 2018-07-25-17:32
+ */
+public class ThreadLocalTest {
+  private static ThreadLocal<Integer> local = new ThreadLocal<>();
+  public static void main(String[] args) throws InterruptedException {
+    Thread t1 = new Thread(() -> {
+      System.out.println(" I am t1");
+      local.set(1);
+      try {
+        Thread.sleep(2000);
+        System.out.println("t1 value: "  + local.get());
+      } catch (InterruptedException e) {
+        e.printStackTrace();
+      }
+    });
+    Thread.sleep(2000);
+    Thread t2 = new Thread(() -> {
+      System.out.println("I am t2");
+      System.out.println("before set , I get " + local.get());
+      try {
+        Thread.sleep(2000);
+        local.set(2);
+        System.out.println("set after 2 s, I get " + local.get());
+      } catch (InterruptedException e) {
+        e.printStackTrace();
+      }
+    });
+    t2.start();
+    t1.start();// 无论怎么更换两个线程的启动顺序，得到的值是不一样的
+  }
+}