添加多线程的学习代码

chenwj1103 · chenwj1103 · commit 628e663f7367 · 2018-04-09T15:36:36.000+08:00
diff --git a/src/main/java/com/chen/api/util/thread/study/chapter1/notShareVariable/MyThread.java b/src/main/java/com/chen/api/util/thread/study/chapter1/notShareVariable/MyThread.java
@@ -0,0 +1,29 @@
+package com.chen.api.util.thread.study.chapter1.notShareVariable;
+
+/**
+ * 不共享变量
+ *
+ * @author chen weijie
+ * @date 2018-04-09 3:02 AM
+ */
+public class MyThread extends Thread {
+
+    private int i = 5;
+
+    public MyThread(String name) {
+        super();
+        this.setName(name);
+    }
+
+    @Override
+    public void run() {
+        super.run();
+        while (i > 0) {
+            i--;
+            System.out.println(Thread.currentThread().getName() + "计算count==" + i);
+        }
+
+    }
+
+
+}
diff --git a/src/main/java/com/chen/api/util/thread/study/chapter1/notShareVariable/TestNoShareVariable.java b/src/main/java/com/chen/api/util/thread/study/chapter1/notShareVariable/TestNoShareVariable.java
@@ -0,0 +1,25 @@
+package com.chen.api.util.thread.study.chapter1.notShareVariable;
+
+/**
+ * 测试类
+ *
+ * @author chen weijie
+ * @date 2018-04-09 3:08 AM
+ */
+public class TestNoShareVariable {
+
+    public static void main(String[] args) {
+        MyThread thread1 = new MyThread("线程1");
+        MyThread thread2 = new MyThread("线程2");
+        MyThread thread3 = new MyThread("线程3");
+        thread1.start();
+        try {
+            Thread.sleep(1000);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+        thread2.start();
+        thread3.start();
+
+    }
+}
diff --git a/src/main/java/com/chen/api/util/thread/study/chapter1/shareVariable/ShareVariableThread.java b/src/main/java/com/chen/api/util/thread/study/chapter1/shareVariable/ShareVariableThread.java
@@ -0,0 +1,18 @@
+package com.chen.api.util.thread.study.chapter1.shareVariable;
+
+/**
+ * 共享变量
+ *
+ * @author chen weijie
+ * @date 2018-04-09 3:16 AM
+ */
+public class ShareVariableThread extends Thread {
+
+    private int i = 10;
+
+    @Override
+    public void run() {
+        i--;
+        System.out.println(Thread.currentThread().getName() + "计算,count=" + i);
+    }
+}
diff --git a/src/main/java/com/chen/api/util/thread/study/chapter1/shareVariable/ShareVariableThread2.java b/src/main/java/com/chen/api/util/thread/study/chapter1/shareVariable/ShareVariableThread2.java
@@ -0,0 +1,19 @@
+package com.chen.api.util.thread.study.chapter1.shareVariable;
+
+/**
+ * 共享变量(优化类,加同步锁)
+ * 多个线程之间进行同步,按顺序排队的方式进行减1操作
+ *
+ * @author chen weijie
+ * @date 2018-04-09 3:16 AM
+ */
+public class ShareVariableThread2 extends Thread {
+
+    private int i = 10;
+
+    @Override
+    synchronized public void run() {
+        i--;
+        System.out.println(Thread.currentThread().getName() + "计算,count=" + i);
+    }
+}
diff --git a/src/main/java/com/chen/api/util/thread/study/chapter1/shareVariable/Test.java b/src/main/java/com/chen/api/util/thread/study/chapter1/shareVariable/Test.java
@@ -0,0 +1,48 @@
+package com.chen.api.util.thread.study.chapter1.shareVariable;
+
+import com.chen.api.util.thread.study.chapter1.notShareVariable.MyThread;
+
+/**
+ * 测试类
+ *
+ * @author chen weijie
+ * @date 2018-04-09 3:18 AM
+ */
+public class Test {
+
+    public static void main(String[] args) {
+
+        //thread实例其实和Runnable代码块一样,可以使用new Thread(thread) 创建线程;
+        ShareVariableThread thread = new ShareVariableThread();
+        Thread t1 = new Thread(thread, "t1");
+        Thread t2 = new Thread(thread, "t2");
+        Thread t3 = new Thread(thread, "t3");
+        Thread t4 = new Thread(thread, "t4");
+
+        t1.start();
+        t2.start();
+        t3.start();
+        t4.start();
+
+//        打印的结果其实时重复的,是非线程安全的
+//        t3计算,count=9
+//        t2计算,count=8
+//        t1计算,count=9
+//        t4计算,count=7
+
+        //在代码块中加synchronize同步锁,使得代码按照顺序执行
+        ShareVariableThread2 thread2 =new ShareVariableThread2();
+        Thread t5 =new Thread(thread2,"t5");
+        Thread t6 =new Thread(thread2,"t6");
+        Thread t7 =new Thread(thread2,"t7");
+        Thread t8 =new Thread(thread2,"t8");
+        t5.start();
+        t6.start();
+        t7.start();
+        t8.start();
+
+        //在执行run方法前,先判断方法是否加synchronize锁,如果上锁,说明其它线程在调用run方法,必须等待其它线程对run方法调用结束后才可以执行run方法
+
+
+    }
+}
