用代码说话：synchronized关键字和多线程访问同步方法的7种情况 (2)

解释：synchronize的关键字只对fun1起作用，不会对其他方法造成影响。也就是说同步方法不会对非同步方法造成影响，两个方法并行执行。

### 5. 访问同一个对象的不同的普通同步方法

public class Demo5 implements Runnable {     static Demo5 instance = new Demo5();     @Override     public void run() {         if (Thread.currentThread().getName().equals("Thread-0")){             fun1();         }else{             fun2();         }     }     public synchronized void fun1() {         System.out.println(Thread.currentThread().getName() + "开始运行");         try {             Thread.sleep(2000);         } catch (InterruptedException e) {             e.printStackTrace();         }         System.out.println(Thread.currentThread().getName() + "fun1运行结束");     }     public synchronized void fun2() {         System.out.println(Thread.currentThread().getName() + "fun2开始运行");         try {             Thread.sleep(2000);         } catch (InterruptedException e) {             e.printStackTrace();         }         System.out.println(Thread.currentThread().getName() + "运行结束");     }     public static void main(String[] args) {         Thread thread1 = new Thread(instance);         Thread thread2 = new Thread(instance);         thread1.start();         thread2.start();         while (thread1.isAlive() || thread2.isAlive()) {         }         System.out.println("finished");     } }

结果：顺序执行。

解释：两个方法共用了instance对象锁，两个方法无法同时运行，只能先后运行。

6. 同时访问静态synchronized和非静态的synchronized方法 public class Demo6 implements Runnable{     static Demo6 instance = new Demo6();     @Override     public void run() {         if (Thread.currentThread().getName().equals("Thread-0")){             fun1();         }else{             fun2();         }     }     public static synchronized void fun1() {         System.out.println(Thread.currentThread().getName() + "开始运行");         try {             Thread.sleep(2000);         } catch (InterruptedException e) {             e.printStackTrace();         }         System.out.println(Thread.currentThread().getName() + "fun1运行结束");     }     public synchronized void fun2() {         System.out.println(Thread.currentThread().getName() + "fun2开始运行");         try {             Thread.sleep(2000);         } catch (InterruptedException e) {             e.printStackTrace();         }         System.out.println(Thread.currentThread().getName() + "运行结束");     }     public static void main(String[] args) {         Thread thread1 = new Thread(instance);         Thread thread2 = new Thread(instance);         thread1.start();         thread2.start();         while (thread1.isAlive() || thread2.isAlive()) {         }         System.out.println("finished");     } }

结果：两个线程并行执行