diff --git a/week_05/42/homework/Thread.xmind b/week_05/42/homework/Thread.xmind
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diff --git a/week_05/42/homework/ThreadLocal.xmind b/week_05/42/homework/ThreadLocal.xmind
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diff --git a/week_05/42/homework/ThreadLocalId.java b/week_05/42/homework/ThreadLocalId.java
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+++ b/week_05/42/homework/ThreadLocalId.java
@@ -0,0 +1,53 @@
+package com.jdk.week5.homework;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * Copyright
+ *
+ * @author conanju
+ * @since 2020/1/14 18:18
+ */
+public class ThreadLocalId {
+    private static final AtomicInteger NEWXT_ID = new AtomicInteger(0);
+    private static final ThreadLocal<Integer> threadId = new ThreadLocal<Integer>() {
+        @Override
+        protected Integer initialValue() {
+            return NEWXT_ID.getAndIncrement();
+        }
+    };
+
+    public static int get() {
+        return threadId.get();
+    }
+
+    public static void remove() {
+        threadId.remove();
+    }
+
+    private static void incrementSameThreadId() {
+        try {
+            for (int i = 0; i < 5; i++) {
+                System.out.println(Thread.currentThread() + "_" + i + " threadId :" + ThreadLocalId.get());
+            }
+        } finally {
+            ThreadLocalId.remove();
+        }
+    }
+
+    public static void main(String[] args) {
+        incrementSameThreadId();
+        new Thread(new Runnable() {
+            @Override
+            public void run() {
+                incrementSameThreadId();
+            }
+        }).start();
+        new Thread(new Runnable() {
+            @Override
+            public void run() {
+                incrementSameThreadId();
+            }
+        }).start();
+    }
+}
diff --git a/week_05/42/homework/ThreadPoolExecutor.xmind b/week_05/42/homework/ThreadPoolExecutor.xmind
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