培训作业

demo1/src/main/java/cn/freemud/demo/CCDemo.java

+package cn.freemud.demo;
+
+import cn.freemud.demo.po.User;
+import com.alibaba.fastjson.JSON;
+
+import java.util.*;
+
+public class CCDemo {
+
+    /**
+     * 测试 hashmap
+     *
+     * @return
+     */
+    public void getHashMap() {
+        HashMap<String, String> stringStringHashMap = new HashMap<>();
+        stringStringHashMap.put("key1", "aaa");
+        stringStringHashMap.put("key2", "bbb");
+        stringStringHashMap.put("key3", "ccc");
+        System.out.print(stringStringHashMap.get("key1"));
+
+    }
+
+    /**
+     * 测试获取userSet
+     *
+     * @return
+     */
+    public void getUserSet() {
+        Set<Integer> test = new TreeSet<>();
+        int a = 1;
+        int b = 8;
+        int c = 3;
+
+        test.add(a);
+        test.add(b);
+        test.add(c);
+
+        //遍历集合test   利用foreach遍历          //输出结果：1   3   8
+        for (Integer value : test) {
+            System.out.print(value + " ");
+        }
+
+        //利用Iterator实现遍历
+        Iterator<Integer> value = test.iterator();
+        while (value.hasNext()) {
+            int s = value.next();
+            System.out.print(s + " ");
+        }                                //输出结果：1   3   8
+
+    }
+
+    /*
+    arraylist
+     */
+    public void getArrayList() {
+        ArrayList<User> arrayList = new ArrayList();
+        User user001 = new User((long)1, "aaa", 11);
+        User user002 = new User((long)2, "bbb", 22);
+
+        arrayList.add(user001);
+        arrayList.add(user002);
+
+        for (User u : arrayList
+                ) {
+            System.out.print(u.getUsername());
+        }
+    }
+
+    /**
+     * linkedList
+     */
+    public void getLinkedList() {
+        LinkedList linkedList = new LinkedList();
+        User userA = new User((long)1, "xiaoming", 20);
+        User userB = new User((long)2, "zhangsan", 32);
+        User userC = new User((long)3, "dfefa", 32);
+        for (Iterator iter = linkedList.iterator(); iter.hasNext(); )
+            System.out.print(JSON.toJSON(iter.next()));
+
+    }
+
+
+}

demo1/src/main/java/cn/freemud/demo/ThreadTest.java

+package cn.freemud.demo;
+
+
+/**
+ * ThreadRunnable
+ */
+public class ThreadTest implements Runnable {
+
+    private  Integer count=10;
+    @Override
+    public void run() {
+        for (int i =0;i<10;i++) {
+            if(i<10)
+            {
+                System.out.print("测试:"+this.count--);
+
+            }
+        }
+    }
+}

demo1/src/main/java/cn/freemud/demo/po/User.java

@@ -2,6 +2,9 @@ package cn.freemud.demo.po;
 
 import com.alibaba.fastjson.JSON;
 
+import java.util.HashMap;
+import java.util.Set;
+
 /**
  * Created by chenwenshun on 2018/9/27.
  */
@@ -52,4 +55,6 @@ public class User {
     public String toString() {
         return JSON.toJSONString(this);
     }
+
+
 }

demo1/src/test/java/cn/freemud/demo/GuavaTests.java

@@ -205,6 +205,42 @@ public class GuavaTests {
         }
     }
 
+    @Test
+    public  void  testHashMap()
+    {
+        CCDemo fs=new CCDemo();
+        fs.getHashMap();
 
+    }
+    @Test
+    public  void testUserSet()
+    {
+        CCDemo fs=new CCDemo();
+        fs.getUserSet();
 
+    }
+
+    @Test
+    public  void  testArrayList()
+    {
+        CCDemo fs=new CCDemo();
+        fs.getArrayList();
+    }
+
+    @Test
+    public  void testLinkedList()
+    {
+        CCDemo fs=new CCDemo();
+        fs.getLinkedList();
+    }
+
+    @Test
+    public  void testThread()
+    {
+        ThreadTest thread1=new ThreadTest();
+        thread1.run();
+        thread1.run();
+        thread1.run();
+        thread1.run();
+    }
 }